Quantity   Component name
1 × STM32F042G6U6 ARM Cortex-M0 Microcontroller with USB interface 32kB flash in UFQFPN-28 package
1 × NCP115AMX330TCG 3.3V fixed LDO in 1x1mm XDFN-4 package
4 × 1541201NC3060 IR phototransistor 940nm in 1206 package, height 1.85mm