I have connected 3 UNOs and 1 Mega 2560, each to a different COM port, separately programmable. Top image shows 2 connected, bottom shows 4.
Project tutorial by Zigster
Two setups for Knight Rider circuit.
Why you can blank, void setup()
Arduino Stepper Motor Barometer with additional displays for last 3 & 6 hour pressure changes.
Project tutorial by Brett Oliver
Find the distance from one point to another faster!
Project tutorial by Saaket Poray
Current Source DAC AD5420 and Arduino UNO
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