I shouldn’t even need it but I had some issues pop up that I thought this isolation may be able to fix it but after testing level shifters and opti-isolators they are making no difference.
I just picked these up at a local Fry’s because they were quick and easy to get for testing.
I have an oscilloscope out now trying to figure out what exactly is causing problems.
I basically have 2 pieces of equipment one with a 3.3v UART port being read by RX pin on the Photon and another 4.5v UART port that is being read on pin D2 on the Photon using Software Serial.
When the 3.3v device is connected the Photon receives the data always without issues. When the Software Serial device is connected by it’s self it works just fine at 19200 baud.
When I plug in both devices at the same time the device on Software Serial stops receiving data while the 3.3v UART device on the RX port keeps on working.
There is a lot going on with this setup with 24v to 5v converters and other equipment so just trying to figure it all out one by one.