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Permalink Reply by Renato Aranghelovici on April 1, 2013 at 11:04pm

If by level you mean voltage, they are not important in this case.

If you mean logic, i.e. reversal of high - low voltage values for logical 0/1, then these are already reversed in jD-IO.

So, you don't need a max !

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Permalink Reply by Mike Machado on April 3, 2013 at 5:34pm

Frankly, I dont know exactly what they mean by level. But I do know you can't talk to an RS232 port by connecting TTL Tx/Rx pins to it. I don't know the exact details, but my understanding is that voltage is different and LOW/HIGH in RS232 are negative and positive voltage, where TTL is 0 and either +3.3 or +5v.

For what its worth, I connected up an Arduino UNO, with its pin 0/1 (tx/rx) to the telemetry tx/rx pins coming from my APM 2.5 and pin 5 up to my FRSky D8R-XP's 'RX' port, along with its GND ports connected from APM telemetry, to UNO and to D8R-XP GND, and powered the Uno from the APM telem +5v. I then loaded the jD_IOBoard_FrSkyMAVLink sketch onto the Uno (pulled from jdrones google code svn repo). 

I have a FLD-02 LCD connected to the back of my DJT module and never got any telemetry other than the stock RSSI that shows up from the receiver.

I tried switching Uno<->APM tx/rx pins just in case something was backwards. I did enable some of the debugging #defines in the code and opened serial monitor at speed 57600 to make sure the sketch was actually running, and it was, because I saw all the EEPROM debug messages.

I was pretty sure this setup would have replicated what the jD-IOBoard was doing, but perhaps I missed something. I am hoping my real jD-IOBoard actually works when it gets here :)

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