A few months ago, I got the FlyCamOne2 as an add-on for my Raptor. The manual mentions that the recording can be started and stopped electronically. With some additional electronics, it should be possible to start/stop the camera from the ground using one of the free channels on my remote.
The free channel can’t be used directly: the receiver sends out pulses of different lengths (between 1ms and 2ms), while the FlyCamOne2 needs a simple short to start recording. Some electronics will be needed to convert between these two.
After some googling, I found the CurveRC FCO2 I/F which does exactly that. But there are some downsides:
- It consumes a lot of power (10mA on 5V)
- Isn’t cheap (£10, plus international shipping, at the time of this post)
- I don’t get to enjoy myself figuring out how to do this myself
The CurveRC print seems to be build around an Atmel Tiny25 microcontroller, which is an 8bit RISC processor with 2K of build-in flash. Using a microprocessor makes the design fairly simple since nearly everything can be done in software. However, it must be clocked at reasonable speed to do something useful. This explains the fairly high power consumption.
So I decided I could do “better”.
Continue reading ‘Convert PPM signal to digital’ »