The LDR must be soldered in a way that it can comfortably see ambient light through the Fresnel lens. To be frank, using a microcontroller is probably overkill for most motion detector safety light ...

This solar tracker system uses the Arduino UNO board, a servomotor ... In the setup() function we set the pins were the LDR are connected as INPUTs and position the servo motor at 90° then wait for a ...