I disclaim all responsibility if you break or damage your equipment when following this tutorial. You’ll follow this tutorial at your own risks
After having seen what Flite test did with their Micro FPV module, I thought it was an awesome idea. But too expensive…
I then looked on the internet and found a way of getting the same outcome for ~$25.
I. What do we need?
We’ll need :
- Micro TX : TX5823, $12
- Micro Camera : Pinhole 600TVL (Sold with a very narrow lens) $12 or this 600TVL which has a built-in wide angle lens (haven’t tried it but should be working fine!)
- 1N4001 diode : $0,10
- Servo Wires + a battery connector : $0,20
- Soldering gear and hot glue
- Optional but recommended : Wide angle lens
II. Before building
a. Preparing the TX5823
Before putting our components together, you need to know the TX5823 pinout:
On my version, I didn’t use dip switchs on CH1-CH2-CH3 pins because I don’t need to switch frequencies. The VTX will transmit on 5945Mhz permanently.
However, if you do want to switch frequencies. You just need to solder 3 micro dip switchs on CH1-CH2-CH3 pins on one side and on the TX5823 top on the other side.
b. Preparing the Pinhole 600TVL
There are 4 wires coming from the camera:
- Red: VCC 3,3V to 5V
- Black: GND
- Yellow : Video
- White : Audio
I advise you to cut the 4 wires ~5cms away from the camera. Then, strip them.
c. Wiring diagram
You’ll need to put everything together according to the following diagram:
Note: You can also supply the set directly from your quad/plane board by soldering the supply cables in parallel with your board’s supply cables. You may then get interference in your video. If so, had a capacitor (from 1000 to 2000µF) in parallel with your supply cables.
UPDATE 04/11/2015 : Since the camera doesn’t like low voltage (when it goes under 3.3V), I recommend you to feed the camera directly from the battery, as shown in the new diagram :
III. Assembly :
a. Antenna soldering :
UPDATE 07/30/2015 : As Vico.C pointed out in the comment section, the antenna length should be 51,72mm if you want a 5.8G wave or 25,86mm for an half wave antenna. I had calculated with the cloverleaf formula. If you used the length indicated on the picture picture below, it’s no big deal since the length is very close to a 5.8G half wave length.
I started by soldering the antenna. In order to save weight, I used a servo wires cut to be
1.04 inch long. Which corresponds to a 5.8G wave. For a monopole, a 5,8G antenna should be 51,72mm (2.04 inches) or if you need a shorter antenna, you can make an half wave antenna wich is 25,86mm (1.02 inch).
If you want to improve the range, you can also solder a cloverleaf antenna. Of course, It’ll get heavier.
To do so you’ll solder the copper core of your cloverleaf’s coaxial cable on ANT and the woven copper shield on ANT GND.
b. Diode soldering :
Why a diode? Because the TX5823 accepts no more than 3.3V . Any voltage above this will cause the TX5823 to overheat (note that a badly conceived antenna will also cause the VTX to overheat). The diode will allow to lower the voltage. You’ll then get ~3.3V from a 1S 4,2V fully charged battery.
To solder it, you’ll first shorten the diode’s legs by half. Then, in order to avoid short-circuits you’ll bend the forward leg to 90° and glue it to the TX5823 as shown below:
c. Other components’ assembly :
To finish, solder the camera and the supply cable:
Some hot glue and you’re done!
For only 5 grams!
Since some of you have asked me, here is DVR pictures of the Pinhole 600TVL’s quality. It’s good regarding its size and price!