Quantity   Component name
1 × nRF51822 module I buy pre-built modules on aliexpress.com (more in the project details).
1 × LIS35DE accelerometer Optional. Not needed if nR51822 module already contains accelerometer (more in the project details)
1 × BC850 NPN transistor for transistor switch module RF, IF, RFID, ZigBee Semiconductors and ICs / Transistors and FETs
1 × TMG3993 ambient light sensor light sensor used in head light