You can use the DHT22 (or AM2302) humidity/temperature sensor and the Arduino UNO board to read data and print it out to the serial monitor ... #include "DHT.h" #define DHTPIN 2 // what pin we're ...

This goes through an OR gate and an inverter to drive pin 13 of my Arduino (the LED built into the board). The net effect is the LED will blink unless you turn the virtual switch on the MyOpenLab ...

Rugged circuits’ boards, Controllinos and those Canaduinos mentioned below have protections for the I/Os, but they also cost a lot more. You can check the schematics (block diagrams for ...