HomeMaster MiniPLC – An ESP32 DIN-rail PLC controller for Home Assistant

The HomeMaster MiniPLC is an ESP32 PLC controller in a compact DIN-rail form factor with ESPHome pre-installed for Home Assistant integration, and designed for residential and light industrial automation. The device features relay outputs, four isolated 24V digital inputs, 0–10V analog inputs, one 0–10V analog output, PT100/PT1000 RTD channels, 1-Wire buses, and an RS-485 Modbus RTU interface. It also includes a 128 × 64 OLED display, four buttons, 12 LEDs, a buzzer, RTC, microSD slot, and optional 10/100Mbps Ethernet, with support for 24 V DC or 85–265 V AC power. HomeMaster MiniPLC specifications: Wireless Module  – ESP32-WROOM-32D-N16 (soldered on the backside of the PCB) SoC –  ESP32 dual-core wireless microcontroller CPU – Dual-core Xtensa 32-bit microprocessor @ 240MHz Memory –  520KB internal SRAM Storage – 16 MB flash Wireless – Wi-Fi 802.11b/g/n, and Bluetooth (4.2 and BLE) External Wi-Fi antenna (SMA) Storage – MicroSD card slot Display – 128 × 64 [...]

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