/products/arduino/b/blog/posts/the-c-was-not-connected-to-my-arduino-hardware-how-to-solve-this-issueArduino code byte relayPin[4] = {2,7,8,10}; //D2 -> RELAY1//D7 -> RELAY2//D8 -> RELAY3//D10 -> RELAY4 void setup(){ for(int i = 0; i < 4; i++) pinMode(relayPin[i],OUTPUT);} // an sample to switc...en-USTelligent Community 12