Super Light Weight RC FPV Quadcopter DIY Solution

TX5823-MC495A -soldering-final-product

Light Weight RC FPV for Quadcopter and other Multicopters

We copter hobbyists love RC FPV flying, and we have seen a lot of awesome FPV videos taken by professional and relatively large multi-copters. But It doesn’t have to be a big quadcopter or RC plane to do FPV. I recently looked into a cheap and light weight FPV solution, and I found a couple of options, which I will be making it happen in this post.

I know someone might have already done something similar before, but there might be something unique in my idea that could be useful to you.

The compact FPV system I have built is only about 20g, now even my mini quadcopter and micro  hexacopter can carry this FPV camera and video transmitter. In this post I will share with you what are the parts you will need and how I made it.

Parts I am using for FPV

At the transmitter side, I tried to use the parts the are the lightest I can find. The 5.8GHz transmitter I am using is the TX5823 which is only 10 gram, and the Camera is MC495A which is 5 gram. So in theory you should be able to build the whole thing under 20 gram!

Both components requires 3.3V – 5V (description on eBay), that’s perfect to power this system from a ESC BEC or a seperate 3.3V Lipo battery. But from the official datasheet for the TX5823, it says it needs 3.3V input, so I am a little concerned. I decided adding a diode to lower the voltage a little just in case. The TX5823 working current is about 150mA and the camera’s working current is about 70mA, so a 1S 360mah Lipo should be able to power this for just under an hour (Tested, around 50 mins).

The TX5823 has 8 channels available controlled by 3 pins. If nothing is connected to these 3 pins, it will be using channel 8 (5.945GHz) by default.
FPV transmitter channels

The receiver I am using is a cheap Chinese RC305 Receiver, it’s got 8 channels and it’s working fine. It’s working current is about 150mA. The monitor I am using is a 7inch LCD display from China. The working current is about 660mA (8W power under 12V). So for a 3S 2200mah Lipo should be able to power the ground station for around 2 and a half hours.

To summarize:

  • TX: TX5823 (£10)
  • Camera: MC495A (£21)
  • Power for TX + Camera: 1S 360mah Lipo (£2)
  • RX: RC305 (£25)
  • Monitor: 7 inch LCD (£25)
  • Power for RX + Monitor: 3S 2200mah Lipo(£5)

Circuit Designing, Building and Testing

I really enjoy designing and building the circuits on the board. It wasn’t straight forward and I got a lot of short circuits when soldering on the vero board. It took me a lot of time trouble shooting and checking the connections using the multi-meter.

In the original design I had quite a few ideas, like adding an LED to indicate power connection, adding a on/off switch, adding multiple voltage inputs for different voltage level (3.3V, 5V, 7.4V) along with voltage regulators etc… And the weight go all the way up because of the extra functionality. So at the end I decided to only keep the LED and remove all other stuff.

I soldered header pins on the transmitter to make it removable from the vero board, that’ also make it really easy for troubleshooting.

TX5823-back

Circuit is quite simple. I added two capacitors for the transmitter to filter out noise, it really improves the quality of the video transmission.

RC-FPV-transmitter-camera-circuit-TX5823-MC495A

Before soldering, I tested the circuit on a breadboard, checking voltage and current are correct. One thing I notice is, when using the diode, DO NOT just use 0.7V as the forward voltage, it changes with forward current. Check datasheet or test it yourself, for 1N4001 I am using, at 230mA the forward voltage is about 0.9V.

testing FPV transmitter camera circuit on breadboard

RC FPV Quadcopter solder on vero board

TX5823-MC495A -put together

I will still need to put an cloverleaf antenna on it, which should increase the range a lot. Without an antenna (Yes, no anntena at the moment), the range is already about 10 meters.

TX5823-MC495A -soldering-final-product

I have yet tested this outdoor, I will probably practice FPV flying first.

Finishing with the FPV cloverleaf Antenna

Finally the RP-SMA male connector and the cloverleaf Antenna have arrived and I soldered them on the board. I also made a little adjustments on how I mount them on the mini quadcopter.

FPV transmitter with SMA connector and cloverleaf antenna

light FPV cloverleaf antenna

FPV quadcopter

 

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17 thoughts on “Super Light Weight RC FPV Quadcopter DIY Solution

    • really? how does that work? I thought communication is one way so power used by transmission is constant? I have been using this setup for short range testing for the last 2 days (within 10 meters) and it’s been working great.
      Anyway I will be adding an antenna to it as soon as my parcel arrive! :-)

      • The power generated by the transmitter has to go somewhere. If a well matched antenna is present, then almost all of the power is radiated out. A less well matched antenna will radiate some of the power and reflect the rest back into the transmitter. No antenna at all will radiate a tiny amount of the power and reflect nearly all of it back… which then gets converted to heat, and can burn out the electronics.

        Your transmitter is very low power though, so it probably can survive being run like this. You’ll just get really awful range. But even a simple piece of wire is a better antenna than none, so do that instead while you wait for your cloverleaf.

  1. How big is the improvement with the capacitors?
    I am building essentially the same setup, but I’m aiming for minimal weight.
    Are they really necessary or can I skimp on them?

    • Unfortunately there is no standard measure of video quality, so I can’t tell you how big the improvement is. put your circuit on bread board to test it yourself I would suggest. It will work without the capacitors, but the capacitor is less than 1 gram, so why not?

  2. Hi Oscar,
    Great info, thanks for taking the time to post and share.

    Question, would it be possible to use and hookup the 808 #16 Keychain Camera to a 5.8Ghz video tx such as the BOSCAM TS-351?

    Thanks,
    Brian

  3. Hello, my project is similar that your, but i want to do a live streaming. I think in use wifi , because, all who want to watch my streaming can watch in any smartphone, u understand? I ask sorry for my English, but, i want to ask if u know how can i do it. Thakns for the attention.

    • maybe try using Raspberry Pi on the Quadcopter, to connect to a webcam, and transmit the video via Wifi? You just need some wifi equipment that is compatible with the RPi to create a wifi network, and you can join the network on your smartphone? that’s just an idea.

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