Quantity   Component name
1 × ESP32 Dev Board Initial pick for a computing core with lots of I/O and spare processing power (32bit dual core) paired with Ultra-Low Power co-processor that can keep things humming under 1 mA
1 × INA219 Breakout Board High-precision power measurement for doing energy harvesting data collection
1 × 128x32 OLED Display Just something to serve as self-contained display, ultimately probably use eInk.
1 × LTC3588 Energy Harvester Breakout Board For harvesting from low-power sources like small solar cells and thermoelectric generators
1 × 40*40mm Thermoelectric Generator
1 × Polycrystalline solar cell Supposedly better in low light than monocrystalline.
1 × Various button breakout boards Input for basic standalone UI plus convenience of solid sub-structure and Integrated pulldown resistors.
1 × Flat cell Li-Ion Battery c. 500mAh Compact energy storage
1 × Various high-power LEDs and heat-sink pads White and Red initially, but IR and UV have variety of uses.
1 × MPU9250 + BMP280 10DOF sensor package Movement, direction finding ... more sensors the better?