Quantity   Component name
1 × Custom PCB 5x5cm 2layer standard 6mil
1 × 18650 LiFePO4 cell ? mAh, hopefully enough to last a while
1 × STM32L051 Access line ultra-low-power 32-bit MCU Arm ® -based Cortex ® -M0+, 64 KB Flash, 8 KB SRAM, 2 KB EEPROM, ADC
1 × ESP-01 module
1 × BME280 module
1 × BHI750 module
1 × QR30E pump