From Jeremy Cook on the Tindie blog:
LED Arduino Debugging Shield
simply plugs into the I/O female header pins on one side of an Arduino UNO, and allows signals to pass through its own headers while lighting up to indicate what is HIGH and LOW
From Jeremy Cook on the Tindie blog:
simply plugs into the I/O female header pins on one side of an Arduino UNO, and allows signals to pass through its own headers while lighting up to indicate what is HIGH and LOW