ESP32/ESPHome SDI12/Modbus Sensor Hub

SDI12

BoM - SDI12:

• Dr. Liu's SDI12 adapter
• ESP32 or similar
• Bidirectional I2C Logic Level Converter (LLC) 5v-3.3v
• SDI12 sensor, like Metergroup Teros12, Acclima TDR-315N, etc

Build Scheme:

Install and configure

1. Open ESPHome dashboard and follow the steps to connect a new device.
2. Access your Home Assistant config files and upload the file sdi12/uart_read_line_sensor.h to config/esphome.
3. Update the device with sdi12/sensor_reader.yaml.

Modbus/RS485

BoM - Modbus/RS485:

• ESP32 or similar
• TTL to RS485 (MAX485) bidirectional module for Arduino
• RS485 sensor, like ComWinTop climate sensors

Build Scheme

Single sensor:

Multiple sensors:

Install and configure

1. Open ESPHome dashboard and follow the steps to connect a new device.
2. Update the device with:
   1. For single sensors: rs485/modbus-sensor-reader.yaml.
   2. For multiple sensors: rs485/modbus-sensor-reader-multi.yaml.