A few things that might help someone starting out with i2c for JF and Teletype. 1. Breadboard female jumper wires (20cm) worked for me. You need 3 wires to go between each module to connect gnd, sca and scl respectively. 2. Make sure that gnd on teletype connects to gnd on JF and likewise for SCA and SCL. Tip: assign a color to each and reuse across modules. Ex, blue wire for gnd, red for sca, green for scl. 3. If you haven’t updated the firmware on JF since middle of 2018, now would be a good time. There is a f/w version that fixed the non-responsive i2c port on my JF. 4. To test your connection works, run this command on your teletype - JF.TR 1 1 in sound or shape mode. The led above identity should blink once. Hope this helps.
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