Radio Controlled BMMCC

Hey

I have a Flysky FS-i6 which is basically a 6 channel radio control transmitter and receiver using PWM to control servos and it also has switches...

I am trying to get the BMMCC to start/stop by assigned Channel 6 to one of the on/off switches and then in the BMMCC assigning SERVO1 to Rec/stop and then plugging the servo1 cable to the correct channel on the receiver.. Red being ground and white being the signal...

It doesn't work!!
Well it did once but doesn't stop when I switched it off....

Is this possible?
It's supposed to work right?
Is there anything else I need to know or do?

Cheers
Mat


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I do not think Red is the ground. Most radios with servos, have three wires, red is +VDC for servo power, Blsck is ground and white the servo control signal.

https://www.blackmagicdesign.com/uk/products/blackmagicmicrocinemacamera/expansion

you would think but no...

Ah, got you. I seemed to have missed this one I was not sure of the BM pin out, which is why, I led with "radios systems" in general. Since they are not connected to real servos, BM just used the signal and ground wires.

In the Micro camera make sure you have selected the correct PWM channel you are using to be Record Start/Stop. Try assigning different PWM channels to Record Stsrt/Stop,to be sure you have the right one.
I had Phil's original One Little Goat, which worked by shorting the PWM bus wires momentarily to start record and again to stop record. I do not think you want to leave them shorted together.
Cheers

PWM is pulse width modulation. It uses the duration of the pulses to control functions. PWM isn't just a switch so you certainly don't want to leave it shorted to ground.


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Any ideas how they set this up then??

I think I have worked out what I need to do...

I need to build a small switching circuit using the change in voltage which is higher than 0.7V which will trigger a NPN transistor switch to go from off to on... Using a relay this will short the SIGNAL and GROUND - the two pins coming out of the expansion cable supplied with the BMMCC - it will start recording and stop when I turn the switch off..

I will test this tomorrow when I pop to Maplin and buy some electronic bits...

I will post up here my solution...

it depends how your transmitter and receiver are set up.

does shorting the cable coming out of the camera start / stop recording? if it does then your plan might work.

however you can probably configure the controller to send the signal you need without building any circuit.

it depends how your transmitter and receiver are set up.

does shorting the cable coming out of the camera start / stop recording? if it does then your plan might work.

however you can probably configure the controller to send the signal you need without building any circuit.

If u short the SIGNAL to GROUND then it starts recording. Then when you unshort it it stops recording...

Can I configure the transmitter to so that then?
I'll look that up...


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Can't find any info so I will create my circuit and feedback...