Light Sensor Module is a part of Blockduino Kit. It was design to simplify the wiring connection between microntroller and the module. It have three wire connection which is Signal (S), Vcc (V) and Ground (G). The signal pin should be connected to Arduino analog pin (A0-A7), Vcc to +5v / +3.3v (ESP) and Ground. This Light Sensor Module use LDR, the signal will send (0-5v) to Arduino pin after passing voltage devider circuit.