Products
Shipping-focused hardware solutions: proven boards and complete systems you can deploy faster.
ESPHome AUX AC PCBA
Extension IoT board for AUX air conditioner control via ESPHome
The 3104-01 is a compact, production-grade board that brings your AUX air conditioner into Home Assistant - no soldering or firmware work needed. Built around an ESP32-S3-WROOM-1, it integrates a TPS562203 switch-mode power supply so it runs directly from the AC unit's internal bus (4.8 V to 17 V). A reverse-polarity protection diode guards the board down to -30 V. The board ships pre-flashed with the ESPHome AUX AC component and creates a Wi-Fi hotspot on first boot so you can enter your network credentials right away. Once connected, the device appears automatically in Home Assistant and exposes indoor/outdoor/compressor temperatures, operating mode, fan speed, swing, and presets. The PCB is 25 x 46 mm, two layers, black matte soldermask, single-side population - sized to fit inside or alongside the AC indoor unit.
Highlights
- Ships pre-flashed — connects to Home Assistant out of the box
- ESP32-S3-WROOM-1: Wi-Fi + BLE, OTA firmware updates supported
- TPS562203 SMPS runs directly from AC internal bus (4.8 V – 17 V)
Greenhouse Controller
Solar-powered greenhouse monitoring and control on a 12 V lead-acid battery
An ESP32-S3 greenhouse controller that charges a 12 V lead-acid battery from a solar panel (MPPT), switches pumps and grow LEDs, measures soil moisture and its own energy use, and integrates with Home Assistant through ESPHome. Built from Circuit Issues KiCad design blocks; the board is being redesigned and prototypes follow.
Highlights
- ESP32-S3 wireless core (Wi-Fi + BLE)
- Solar MPPT charging of a 12 V lead-acid battery (BQ24650)
- Buck converter for the logic rail from the 12 V battery