The order of the shield stacking is the following (from bottom to top), Arduino Mega, SmartThings shield and RS232 shield. Make sure that the SmartThings shield serial port selection switch is set to ...

The Arduino Mega's PWM pins are digital output pins located on D2 to D13 and D44 to D46, coming to a total of 15. While they function as normal digital pins that can switch a component either ...

As a result, the connection between the Arduino Mega and the transceiver MCP2003, for both Master and Slave, should be uncrossed: Tx to Tx and Rx to Rx. Fig. 1. The actual data transfer is done on ...