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H: Convert perpetual magnet motor output to 5 volt DC
Disclaimer: Hi, I was in the neighborhood (StackOverFlow) and just noticed this cool site. I have had this general wondering for a while now and I am not sure if my question is constructive enough for this site (not from EE background). But I am genuinely intereste... |
H: NI-MH battery monitor design. Any obvious errors?
Let me preface this by saying I'm not that much of an EE expert, this is a "hobby" project, I consider myself as knowing enough to be dangerous. ;) I'd never apply for a full time career as an EE designer, that's for sure.
That said, I saw this: Low Current Battery... |
H: Motor controller diagram
I have been reading about motor controllers, and I found this article online (Introduction to Motor Drives and Encoders), but I am having a hard time understanding the diagram (figure below). Can someone explain the process of this control system in an algorithmic manner? I am really confus... |
H: Are all solenoids waterproof?
I have an application where I need a solenoid to control a valve at the bottom of a tank. For unimportant reasons the valve needs to be inside the tank at the bottom.
I was wondering are all solenoids inherently waterproof?
Current will follow the path of least resistance (kirchhoff's ... |
H: How do I do basic circuit analysis with resistors rated in watts instead of ohms?
In my electrical circuits class, we've spent the last six weeks learning circuit analysis with resistors rated in ohms. Now, out of the blue, every question on the next practice exam has the resistors rated in the watts they consume. ... |
H: Safe Lithium-ion Battery Management
I'm building a device that needs to run from Lithium-ion batteries.
I am well aware they need to be charged/dis-charged properly to avoid damage and explosions.
To my knowledge a charging system has two components which are the managed charging and cut-off once charged and discha... |
H: Retrieving data recorded by an IoT sensor
If an IoT object records data (accelerometer, gyroscope, ...) in memory, what would be the smartest way to retrieve these data after, let's say, 2-3 days?
Store in JSON format on an SD Card?
Store in Memory then wire: USB?
Wireless: with BLE? XBee?
The idea is to retrieve... |
H: Smart ways to control an LED ladder?
I have two sets of LED ladders (12 in each ladder, so 24 LED's) that I want to control from my microcontroller. I don't have enough inputs for 24 LED's (and want to make it scalable), and the microcontroller has other tasks to attend to, as well as control the LED ladders.
I do... |
H: How much AWG do I need for 12V 20A
How much AWG do I need for my circuit wires knowing that the current can vary 10 to 20A with 12V supply
And what is the cheapest and safest way to join 2 wires together ?
AI: Using an online calculator which is based off some MIL standard for current carrying capacity of copper wi... |
H: Connecting a surround system without jacks
I have recently bought a house which has already the sound cables passing through the walls. These are raw cables without any jack connectors.
My question is, when you go to buy a 5.1 surround system (or any speakers for that matter), what do you ask for when you do not w... |
H: What is the use of magnets around electrical cables?
I haven't seen any for a while now, but a couples of year ago I saw some several times: cylindrical magnets around electrical wires. I'm not talking about specialized equipments but items of everyday life which comes with such a magnet. In fact I did not know it ... |
H: Indicated vs. true RMS value of sawtooth waveform
A sawtooth waveform is fed to "Average reading (with full scale rectification)" ac electronic voltmeter. This voltmeter is calibrated for RMS value of pure sinusoidal input. What will be reading displayed on voltmeter? Also find percentage error in the reading. Take... |
H: Did I do this circuit diagram correctly?
I just need some feedback on the circuit diagram I made (it's my first time):
This is for a mini-car. There are two battery packs, one connected to an Arduino UNO, and the other connected to two motors. Both battery packs have a SPST switch.
The battery pack connected to t... |
H: Protecting a circuit from the effects of a capacitor's charging
During its first outing, I managed to burn out the (control circuitry) of two of the batteries connected to my LED jacket (see this, this and this question for context.) I thought I should have been well within spec for the total current I was drawing,... |
H: Is there any offline circuit simulator software that can simulate a noisy power supply?
I have been using Circuit Wizard (Its the only offline program that I can find!). Unfortunately, it is really basic, and I have outgrown it.
I need to simulate a 5V circuit with a noisy power supply, with a lot of ripple/noise ... |
H: How do I read this relay pinout/schematic?
I'm trying to understand the way this relay works. To me it looks like this KUHP-11DT1-12 is a DPDT relay. Pin 7 is connected to 1 or 4 and pin 9 is connected to 3 or 6 depending on whether the coil is energized or not.
What I cannot figure out from looking at the datash... |
H: Integrating simple Bluetooth functionality without microcontrollers
I have recently bought a Bluetooth HC-05 Module, and have followed many tutorials on integrating it with an Arduino, or a microcontroller. However I got interested in whether it is possible without one. And the task I need to achieve is pretty simp... |
H: Wiring up an LCD display with unknown controller
I found an old LCD in my pile of trunk. I would like to be able to use it. However, someone (possibly / probably me) sawed off the part of the PCB with the series code, so I can't know what the controller chip is. I'm trying to figure it out.
My analysis so far:
Th... |
H: Joining a raspberry Pi to an external hard disk cage power supply
I have an external SATA hard drive enclosure that has its own power input. I would like to be able to run a Raspberry Pi from the same power input.
The enclosure takes a 12VDC input (currently I'm using a 1.5A power supply but I'm sure I have a 2A on... |
H: Capacitors vs buck/boost converters
I'm trying to drive high power LEDs with a laptop power supply, and wondered if I should use resistors to limit the extra current, or something like this to limit the current. If I did use that module, I would run it at 55V @ .7A
I'm aiming for decent efficiency without designing... |
H: A simple RL circuit, getting transfer function, matching with results
I'm doing little lab exercise with an RL circuit. I need to check if I did this analysis right, because the numbers I got and the numbers that should theoretically be there are so far off, I figured I had to be doing something wrong.
We have th... |
H: A-D conversion: effect of adding more bits
Say you have a digitizer that's converting an analog signal and feeding it to a microprocessor for whatever you'd like to do to it. How would increasing the number of bits of the digitizer affect the signal? I feel like it would have something to do with the resolution of ... |
H: PCB design review: Decoupling, bypassing and grounding
I'm trying to make my own wireless sensor using ATmega microcontroller. I've some basic understanding of electronics but I'm a total amateur when it comes to designing circuits and PCBs.
This is just a hobby project so it's not expected to be of a production qu... |
H: Creating an isolated power supply to prevent effects of lightning
Transformers isolate the load completely from the primary power source. Does that mean that I can connect two or more transformers one after the other and expect my Linear Power Supply to have better safety than having the isolation of one transforme... |
H: COTS solutions for ±18V DC (or even ±20V) and ±30V PCB-mounted power supplies in the 3-5 Watt range
Most manufacturers make DC-DC converters with only ±15V or ±24V outputs for driving opamps. Opamps generally fall in several max-DC-supply classes. Typical are the ±22V ones (e.g. LM741 and a ton more), some of which... |
H: Solderless breadboards: standard size specifications?
Are there standard sizes for solderless breadboards?
For example, My teaching project is currently reaching the capacity limit of a 170 pin (17 x 10) breadboard. Is there a standard "next size larger" I can specify?
AI: There are various de facto standard sizes... |
H: How to Calculate Mosfet Voltages
For a N-channel Mosfet does Vds = Vdb + Vbs? Is this only true for simple models or always?
Where d is drain, s is source and b is base.
AI: B is body on a MOSFET, not base. The relation you posted is true regardless of model - it's how the pin voltages are defined.
The voltages ... |
H: How to make LC tank circuits oscillate continuously?
An LC tank circuit produces oscillations, when the capacitor is charged and connected to the inductor, but the oscillations decay gradually. How to make it continue, i.e. oscillate continuously?
I know we need to add energy continuously, but I don't know how.
Cou... |
H: Why LED screens have to twinkle?
I was researching in psychophysic on optic experiment and I stumble upon my laptop manufacturer'screen specs. There is a 60hz refresh rate with exponentially decaying lums intensity between each tick.
Wouldn't it be visually nicer if the digital video signal were converted to cont... |
H: What determines a load's current requirements?
Apologies if this question has been asked before. I'm sure it has but hard to find as wording of question may not bring up the duplicate question.
Let us say we have a 10 ohm resistor as a load. Under a power source of 5V, it will draw a 500mA current. In this scenario... |
H: Do I need a base resistor for a BJT?
I have a 74HC595 shift register that I shift bits into from an 5v Arduino. The pins on the shift register is connected to the base of 2N3904 BJT's through a 4.7kOhm resistor. I have noticed that if I include the base resistor, my current to the base is 12.8uA and if I don't the ... |
H: Will ARM replace that older processor architecture?
I know that those processors with ARM architecture have their advantages, but will it replace those old kind of ones? Or they just will be dealing with different kinds of applications and continue to live?
Edit: I am not seeking a fotrune teller. I just needed som... |
H: Can I use the 12V line of a computer PSU to power my circuits?
Or is there any issues I should be wary of? I need at least 7A on a 12V line, but I've found that a computer PSUs are significantly cheaper.
AI: Yes.
There's not much more to say than that ;)
Getting them to turn on though can be a bit tricky. Some ma... |
H: How can I generate a sinusoidal voltage and current waveform using half-bridge or full bridge inverter?
I know how a half bridge and full bridge circuit looks like. What I don't understand (and I simulated it) is that whenever I drive the switches using a pulse generator I get a square wave as an output. I am not f... |
H: Why are synchronous counters synchronous?
Doesn't the input signal having to propagate through the AND gates cause a propagation delay anyway? With the asynchronous counter the delay was caused by the clock signal - with the synchronous counter wouldn't the delay exist anyway, just with the input instead?
AI: With... |
H: Possible to use external graphics program to design KiCad edge cuts?
Is it possible to create the outline for your PCB using a drawing package and then apply it within KiCad somehow to make your edge cuts? I am designing a board that must fit into a 72 pin SIMM socket and getting the exact dimensions and shapes for... |
H: Modeling FPGA logic element responses
I'm working on modeling a circuit implemented on an FPGA, and the fundamental question I keep running into is this: what is a logic element? I need to be able to model the temporal response of the output when the input changes as accurately as possible. Right now we are using... |
H: Where does the power supply go in an SR Latch?
I understand how an SR Latch works: is S is 1, it will set Q to 1. If R is 1 it will set Q to 0.
If both S and R are 0, the value of Q should remain unchanged (right?). So the circuit has these stable states:
Now my question is: If 0 voltage is flowing through both t... |
H: Best way to make LEDs flash in time with a music source
Could someone suggest the best circuit to make LEDs flash in time with a music source directly connected to the circuit? BTW the circuit needs to run off batteries, I've seen circuits using TIP31 transistors, but are they any good?
AI: There's a website for an... |
H: Determining End-Of-Life for electronic components
What is the best way to determine the end-of-life time-line for ICs other than contacting the manufacturer directly? Is there a central registry or service where I can subscribe and get EOL notifications for the parts used in my designs? How does everybody else hand... |
H: Does ferric chloride etchant "go bad" after some period of time?
I have some old circuit board etching solution (ferric chloride) that is unused but a few years old and has not been in a temperature controlled environment. It has been sitting, all but forgotten, on a shelf in my garage.
I'd like to etch some sma... |
H: Reset I2C slave chip when master goes away
I have a board with a transformer and a MCP23017. This board is connected to another board via 4 wires which bring over power (+5V, GND) and I2C bus for an ATmega328P acting as the master.
The ATmega will enable some pins on the MCP23017 when the user selects an input. The... |
H: How are radar returns sorted in range space in Synthetic Aperture Radar?
I'm trying to understand how a SAR system is able to place returns it receives in range space.
Consider the scenario when an airplane is passing over terrain and is imaging it using SAR, as shown in this image from radartutorial.eu:
If it rel... |
H: STMicro library for setting RTC Alarm on Sunday is incorrect?
I'm using a stm32fxx ARM Cortex-M3. When setting an RTC alarm for Sunday, I realized that the stm32l1xx_rtc.h header file defined Sunday as:
#define RTC_Weekday_Sunday ((uint8_t)0x07)
In code, I do this:
rtc_alarm.RTC_AlarmDateWeekDay =... |
H: JTAG Circuit to prevent back powering
Reading a presentation on an MPU evaluation board I found this particular circuit:
Can someone please explain me the logic behind this and what is this "back powering" scenario that the presentations talks about?
AI: Back Powering is what happens when data entering an un-power... |
H: Real equivalent of terminal resistance
I found in a book a scheme representing a terminal connection used in making an ammeter shunt (with the purpose of extending its measuring domain).
I can't understand what the drawing at b) represents. All those resistances want to model the contact resistances.
Then, the bo... |
H: How should I test a coaxial cable?
I'm a ham radio operator, but haven't been very active on HF bands for a while. I have an inverted-V antenna and a long run (approximately 25m) of coax that runs from my upstairs "shack" down the wall, through a conduit that I buried in a trench and up near a tall oak tree in whi... |
H: Can I power the VTX and FC from the same vbat pad on the ESC?
I have the Hobbywing x-rotor 60A 4 in 1 ESC and the TBS Unify pro hv race.
Since neither my FC or ESC has a 10V regulator, I need to power both from the battery voltage. There is however only one battery pad on the ESC; will this be okay?
AI: Yes, you ca... |
H: What is the proper method of tuning PID filters for recent BetaFlight (4.x) on micro-sUAS WITHOUT Blackbox?
I've included my specific platform below, but this question should be applicable to other platforms just as well.
Board:
Matek F411
Platform:
BetaFPV Beta65 Pro 1S (65mm m2m)
I know there are serial logging d... |
H: Why are most multirotors built with an even number of rotors?
The most common types of multirotors are quadcopters, hexacopters and octocopters (with four, six and eight rotors respectively).
Are there scientific reasons why most drones are built with an even number of rotors?
AI: Yaw authority and ease of mixing i... |
H: Storing drones during the winter
Up here in Canada, it can get kinda cold during the winter. And just because of where I tend to use my drone, it can be easier for me to store it in an outdoor (dry, but unheated) shelter than to haul it back to the house all the time.
Is it okay for drones (Eachine E520S) to stay o... |
H: Are there any alternatives to BetaFlight?
I wonder if there are any alternatives to BetaFlight. If there are any alternatives, what are their advantages and disadvantages?
AI: Among open-source options, Emuflight, INav & Ardupilot (different focus) Butterflight (mostly defunct), Raceflight (mostly defunct). There ... |
H: How do you figure out which motors to use for your UAV?
There are a ton of electric motors on the market. Is there a mathematical formula or some other means of figuring out which size of motor you will need for your airplane, helicopter, or drone?
AI: N.B.: This applies particularly to drones, and to a lesser exte... |
H: Why did a quadcopter in vertical descent appear to lose thrust and descend rapidly?
Towards the end of a flight with a quadcopter, I started a vertical descent to come in and land. There was no wind on that particular day so I just came straight down.
Shortly after starting to descend, the quadcopter started fallin... |
H: Why was 32kHz gyro sampling removed from Betaflight?
For a while, the BetaFlight multirotor firmware supported 32kHz gyroscope polling, but now that feature has been dropped in favor of 8kHz being the highest polling rate. Does anyone know why this was removed?
AI: In order to access the 32kHz gyro sampling mode, t... |
H: How low can I safely discharge a LIPO battery during flight?
What is the minimum voltage I can safely discharge a LIPO battery during a flight?
For example, if I have a 3S LIPO battery, should I be aiming to land my RC plane before the battery gets below a certain voltage?
Related to that, is it the voltage under l... |
H: Why do 48KHz ESCs increase flight time?
I was looking at ESC settings for whoops/toothpicks and have seen how the 48KHz JESC firmware can increase flight time. Why is this? Thanks!
AI: To clarify, the 48kHz is NOT running on the gyroscope or the FC firmware.
What 48kHz is referring to is the PWM Frequency in the ES... |
H: What does the C rating on a LiPo battery mean?
I see LIPO batteries specify a C rating on the label.
What does that stand for and how does it affect the performance of the battery?
AI: The C rating is a multiplier that dictates discharge. You can figure out the maximum theoretical discharge by multiplying the C r... |
H: How does weight factor into legal allowance in Germany?
I'm in Germany and I want to buy a drone. Are there any weight-dependent flight restrictions?
AI: There's quite a good summary of the rules on the website of the federal transport department (BMVI):
https://www.bmvi.de/SharedDocs/DE/Publikationen/LF/flyer-die-... |
H: What sort of fuel do model jet plane engines take?
I've seen several gas powered model jet airplanes at air shows. Do these smaller engines take the same type of fuel as their full-size counterparts, or do they just use 2-cycle gas like their propeller brethren?
AI: I think the only real answer is... it depends on ... |
H: How can I safely parallel charge my LiPo batteries?
I have multiple LiPo batteries that I want to charge up so I can get out flying as fast as (safely) possible.
With my existing LiPo charger, how can I parallel charge multiple batteries at once?
AI: Only parallel-charge batteries with the same number of cells.
Sa... |
H: What is a ground loop and how does a common ground reduce video noise?
To reduce video noise, it is often recommended to add a common ground between VTX and camera to avoid ground loops. What is a ground loop, how does it add video noise and how can a common ground negate its effects. Thanks.
AI: If enough current ... |
H: Is it safe to fly LiPo batteries after they get "puffy"?
Some of my LiPo batteries got "puffy" after a few months. Is it still safe to fly them, or should I safely dispose of them?
AI: You should dispose of them.
A LiPo battery has three parts: the anode (negative plate), the cathode (positive plate), and electroly... |
H: Should Crossfire transmitter antenna orientation match receiver antenna orientation?
I've always heard that you should orient the antenna on the Crossfire transmitter vertically, with the ends pointing up and down. I've also heard that you should do the same with the receiver antenna (immortal T), but on many build... |
H: How can I reverse the direction of a brushless motor?
I have a brushless motor on my RC plane. After connecting it to an ESC and testing it I've found that it is spinning in the wrong direction.
How can I reverse the direction the prop is spinning?
AI: Swapping any two of the wires connecting a brushless DC motor t... |
H: What does it mean for SBUS to be an inverted protocol?
I've heard talk about how F4-based flight controllers can't natively support the SBUS receiver protocol without special circuitry. What does this mean and what hardware is needed to invert an inverted protocol like SBUS?
AI: A serial signal is composed of a ser... |
H: What's the advantage of props in VS props out?
I've heard that the quad will handle better if you reverse the propeller direction (props out), but is the difference noticeable? Especially for a relatively new pilot. Should you use props out from the beginning if you aren't used to one or the other yet?
Are there mo... |
H: Why do brushless motors have 3 wires compared to 2 wires on a brushed motor?
I'm familiar with regular DC motors, which is what brushed motors appear to be. They have fixed stator magnets, rotor coils connected to the shaft and two brushes that power the coils at the right time via a commutator. By varying the amou... |
H: What makes mushroom antennae so good at receiving and transmitting omnidirectionally?
I've seen many references saying that mushroom antennae (like the one shown below) are excellent at receiving and transmitting omnidirectionally. I have them on my drones' video transmitters and one paired with a patch antenna on ... |
H: How to know if a place is a no-drone zone in the UK?
I live in the UK and often hear that a lot of places are "no-drone zones" meaning flying a drone there could get you a penalty.
Is there any database for these zones as often signage isn't clear?
AI: There are two considerations on whether you can fly somewhere -... |
H: How to avoid a drone going out of range?
I have a simple drone (less than 250 grams), I want to fly it as high as possible to take photos with it, how can I make sure it doesn’t go out of range considering it has no altitude indicator? What would happen if it does go out of range, would it just fly off?
AI: The fir... |
H: New Prebuilt Drone flipping on takeoff
I have a small quadcopter drone, immediately on takeoff it flips upside down, this happens all the time.
What could be a potential problem?
Edit: It is prebuilt and bought from a shop and has never flown
AI: Additionally to the options listed above, looking into whether or not... |
H: Freshly built quadcopter/drone flips on takeoff
I just finished building my first quadcopter/drone and it flips when I try to take off.
What could be wrong?
What troubleshooting steps should I take to fix it?
AI: In my experience, the causes of this problem are (in order of probability )
One or more propellers are... |
H: Take drone on a plane in Europe?
I want to take my small (<250 grams) drone on a plane in Europe? Are there any rules regarding this? Should the drone go in carry-on luggage or in the hold?
AI: I am not a legal expert by any means, so I just want to say that disclaimer.
As far as I am aware, you can check in the dr... |
H: Why do the motors on my drone keep spinning up and max out when I run up the throttle on my radio on the bench?
When I test my drone for the first time and I run the throttle up form my remote with the props off the motors keep spinning even when I bring my throttle back down. Will my quad flip out if I put the pro... |
H: What is the analog video input pinout on the DJI FPV goggle?
I want to build an adapter cable for DJI FPV goggles analog video input. What is the correct connector type and the pinout for the analog signals?
AI: There is a project on thingiverse that shows the pin connector for the video input of the DJI goggles.
I... |
H: What should I keep in mind when picking my first drone?
While I don't know much about drones yet, I've seen people use them to make awesome photographs and videos, and I want to be able to do that too.
Since I've never flown a drone, I'm looking for a drone that I can use to learn how to fly, it should probably als... |
H: What is the advantage of SBUS over IBUS?
Flight controllers have to implement an inverter to process the SBUS signal. Why is SBUS not just uninverted?
AI: SBUS and IBUS are both digital protocols and for a digital protocol, you define two voltage values to represent an active state and one inactive state. This is d... |
H: What are 'Modes' of a transmitter / controller?
I have heard a lot of reference to the 'Modes' of a transmitter/controller.
What is the Mode of a remote controller, and what is the difference between them?
AI: The Mode of a transmitter refers to which stick on the transmitter controls which movement on a drone. Th... |
H: What aviation regulations govern the use of drones in Ireland?
I am thinking about starting to fly drones in Ireland. What are the rules that are going to apply, and where can I find the latest information about the laws that govern the hobby in Ireland.
AI: The use of drones in Ireland is covered by the regulatio... |
H: Drones to fly indoors
Due to the current situation, I can't go outside to fly my drone. What's a small and easy to control nano drone I can fly indoors (no camera necessary)? It should be easy to control as I don't want to crash into anything but don't want to give up drone flying altogether.
AI: This depends - do ... |
H: What is the difference between FPV or LOS, angle or acro drones?
What is the difference between FPV or LOS, angle or acro drones? How are they different?
AI: So FPV and LOS are ways to fly the drone, with FPV being First Person View and LOS being Line Of Sight.
In FPV, one generally has a fixed camera on the aircra... |
H: What are the exact specifications of a RushFPV SMA connector?
I am designing a mount for a RushFPV SMA connector and have not been able to find the technical details.
I need:
The diameter of the connector
The distance between the mounting screw holes
The dimensions of the mounting plate in which the holes are cut.... |
H: How can I configure a servo in Betaflight?
I’m looking to make a drone capable of deploying a parachute, so I need a servo release mechanism.
How can I configure a servo and map it to a switch in Betaflight?
Thanks.
AI: There are multiple ways to enable servos in BetaFlight, but since you need only one servo it is ... |
H: Why do higher voltage batteries need lower KV motors?
I've noticed that higher voltage batteries need lower KV motors, why is this?
AI: They don't necessarily, however a given amount of power will be required to rotate a motor at a certain RPM with a given propeller.
kV, the voltage constant of a motor, is the maxi... |
H: Alternatives to LiPo batteries
LiPo is often the first choice of battery due to its high discharge rate and high specific energy (100 - 265 Wh/kg), defined as its energy per unit mass.
In terms of these two characteristics, what type of batteries are next best alternatives to LiPo?
AI: Many people choose to use Lit... |
H: How can I take aerial photography without leaving my house?
I have found a place I can fly my drone, and want to take some photos of it. At the moment it's ill-advised to leave one's home unless it's necessary, and aerial photography of abandoned places is not necessary, so I want to try to do this by releasing pil... |
H: Remap not yet existing uart
I have a flight controller that has one uart to little. So i tried to remap SERIAL_TX 5 (That doesn't exitst on the FC) to pin A09, that previously had SERIAL_TX 1, but that doesn't seem to work. I also tried to remap SERIAL_TX 5 to LED_STRIP, but that didn't work either. Is there someth... |
H: How important is the plastic coating around a coax?
I was swapping over my pigtails and part of the plastic coating around the coax came off.
The coax is still firmly soldered to the SMA connector - is this salvageable with some heat shrink, or do I need a new coax?
Thanks.
AI: The outermost plastic coating is not... |
H: What is the meaning of 'control of a building' in the UK Air Navigation Order on Unmanned Aircraft?
The UK drone regulations include the requirement that camera drones are not flown "within 50 metres of any vessel, vehicle or structure which is not under the control of the SUA1 operator or the remote pilot of the a... |
H: Is there an international competition that yearly chooses the best drones in the world?
Is there an international competition that chooses the best drones in the world?
Is there a yearly “Oscar” for drones, somewhere?
If so what are various categories that are listed?
AI: I don't think there is any international co... |
H: Why does the video cut out on HX-100 drone?
I have a BetaFPV HX-100 drone which I recently got. When I tried to fly it FPV the video feed would cut out and leave a grey screen. The OSD still showed up in the goggles so I'm not sure if there is a problem with the camera or video transmitter.
The VTX was hot to the ... |
H: How do I set up LUA scripts on my OpenTX radio?
I’m looking at how to use LUA scripts and was wondering how to configure them I am OpenTX radio.
Thanks.
More info: at present, I don’t want to write my own scripts, only run scripts that I can find online, such as VTX control.
AI: Download LUA scripts you need, for V... |
H: How do I safely dispose of my LiPo batteries?
I have an old LiPo battery that is nearing the end of its life, how can I dispose of it safely?
AI: First is to discharge the battery to zero volts which can be done by using a LiPo charger or a light bulb. It can then be thrown into a recycle bin, but check with your m... |
H: How much does mounting an antenna near a carbon fiber frame degrade signal reception?
By how much is signal reception degraded if I mount my RC receiver antenna next to the carbon fiber frame of my quadcopter?
I've heard that it's a major sin to do this because there is some sort of interference generated by the c... |
H: Quadcopter getting hot after a flight
I have a small quadcopter and after around a 10 minute flight, I can feel it gets very hot. Is this normal?
AI: "Hot quadcopter" is a bit broad of a term, a lot of things can be hot in there.
Maybe it's the VTX, then it's normal, they can get hot up to 80C. You might want to u... |
H: Why is it bad to power up a drone without an antenna on the VTX?
I've heard a few times now that if you power up your drone you have to make sure that you have an antenna on the VTX. Is that true? If so, what will happen if I power up my drone without an antenna on the VTX?
AI: Short answer: Yes, this is very much ... |
H: How long does a LiPo battery last and how do I know if it needs replacing?
I have an old LiPo battery, how long is a LiPo battery usually supposed to last? How will one know if it needs to be replaced?
AI: This question is difficult to answer without a few specifics.
By ‘how long does a LiPo last’, if you mean when... |
H: USB Webcam Parts for FPV?
I have a camera taken out of an old usb webcam. It has four wires attached to and labeled on the board: 5V (red); DM (white); DP (green); and GND (black). I was thinking I could use it just like a 'normal' FPV camera and get a video transmitter for it. However, it has four wires rather tha... |
H: Restore over-discharged LiPo batteries ~2.0V/cell
I have a LiPo battery which is ~2.0V/cell, how can I restore it safely? By "safely" I mean how can this be controlled as I know LiPo batteries can be dangerous.
AI: Firstly, I'll add the usual statement that mistreated LiPos can be dangerous and you are almost alway... |
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