![]() ![]() When I now enter text from the monitor, the TX light on the MAX232 flashes, but nothing shows up on my Arduino LCD. When I change the IDE port to check on the serial port connected to the RS232 side of the MAX232 (rfid), I see TEST being printed every 500ms, and the RX light on the MAX232 flashes, as expected. When I type in a letter and send it, the LCD gives the numerical value of whatever letter I entered, as expected. Results of the sketch: When I monitor the arduino in serial monitor it shows TX -1 and RX -1, since nothing is happening. I wrote this sketch to test the MAX232 (turns out it has a MAX3232 chip which uses 3.3V, so I connected it to my Arduino's 3.3V supply instead - same results.) #include Īdafruit_RGBLCDShield lcd = Adafruit_RGBLCDShield()
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