The HomeMaster MiniPLC is an ESP32-based DIN-rail PLC controller preloaded with ESPHome for local, cloud-free Home Assistant integration. It packs relay outputs, isolated digital and analog I/O, PT100/PT1000 RTD channels, 1-Wire buses, RS-485 Modbus RTU, an OLED display, RTC, microSD slot, and optional Ethernet, running on 24V DC or 85–265V AC. The hardware is open-source (CERN-OHL-W v2) with MIT-licensed firmware, carries CE certification and Open Home Foundation's 'Made for ESPHome' recognition, and sells on Tindie for $324 with EU-only shipping, alongside companion modules like the MicroPLC and energy meter add-ons.
Questions this post answers
What I/O does the HomeMaster MiniPLC ESP32 DIN-rail controller offer for Home Assistant automation?
It provides 6 SPDT relay outputs (3A/250V AC), 4 isolated 24V digital inputs, 4 0-10V 16-bit analog inputs via ADS1115, one 0-10V 12-bit analog output via MCP4725, 2 PT100/PT1000 RTD channels via MAX31865, 2 1-Wire buses for DS18B20 sensors, and an RS-485 Modbus RTU master port. Compare DIN-rail automation hardware options like this on daily.dev before wiring up a smart-home project.
Does the HomeMaster MiniPLC require a cloud connection to work with Home Assistant?
No, it ships with ESPHome pre-installed and connects directly to Home Assistant over the local network without any cloud service. It uses an encrypted native API, each unit generates its own unique encryption key during setup, and initial configuration is only allowed within a 15-minute window after power-on. Track local-first, privacy-focused smart-home hardware releases like this on daily.dev.
What is the price and shipping availability of the HomeMaster MiniPLC?
The HomeMaster MiniPLC costs $324 plus shipping on Tindie, including the controller, an external Wi-Fi antenna, and a user manual. Shipping is currently limited to the EU, so buyers outside that region cannot order it directly from the store. Follow niche DIY hardware launches like this one on daily.dev when scouting parts for a build.