Tidal Clock

A gift, so no burden of Wi-Fi setup or charging. It must just work. It runs real tide, moon and sun calculations on-device and lives for years on two AAs.

Office Display

A quick build: ESP32-C3, SCD41 and a 4.2" e-paper. Plots CO₂, humidity and temperature, shows moon phase, weather and the next train home.

Comms Platform

A miniaturised PCB with Wi-Fi, Bluetooth and LTE for remote data logging. Runs from solar or USB through a proper BMS, cheap enough to leave in the field.