I've noticed that when I'm sending serial data to my computer's serial monitor, the tx light only lights up when the serial monitor is open. When I close the monitor, it seems to stop sending data. Is this a normal thing?
The reason I ask is because I'm really trying to send data from my esplora to an uno, and I notice that despite (1) having the grounds of both arduinos connected and (2) connecting the esplora's tx pin (reset_lcd) to the uno's rx pin (pin 0) and the esplora's rx pin (dc_lcd) to the uno's tx pin (pin 1), the tx light on the esplora and the rx pin on the uno don't light up at all.
What could be the problem?
What could be the problem?
.... why do you think that there is a problem? .... you also said nothing about the actual data transfer between the Esplora and the Uno – jsotola Oct 5 '18 at 3:53