Sonoff Dual R3

Sonoff Dual R3

The Sonoff Dual R3 is a dual-channel smart relay with integrated power monitoring. Based on the ESP32, it's one of the most popular devices for Tasmota motorized blind/shutter control thanks to its dual-relay interlock capability and power measurement.

Key Features

• ESP32 dual-core at 240MHz with WiFi and Bluetooth
• Two independent relays — 10A/240V each (can be interlocked)
• Power monitoring via CSE7761 chip — per-channel voltage, current, power
• Motor mode — built-in interlock for AC motor control (blinds/shutters)
• Two switch inputs — for physical wall switches (toggle or momentary)
• 100-240V AC input (neutral required)

Tasmota Compatibility

• Flash via serial header (GND, TX, RX, 3V3, GPIO0)
• Use tasmota32 binary
• Power monitoring via CSE7761 driver
• Shutter mode with SetOption80 1 for motorized blinds
• Position calibration via Tasmota commands or Google Sheets tool

Shutter/Blind Control

The Dual R3 is the go-to Sonoff device for roller blind automation:

1. SetOption80 1 — Enable shutter support
2. ShutterRelay1 1 — Assign relay pair
3. ShutterOpenDuration1 15 — Set open time in seconds
4. ShutterCloseDuration1 15 — Set close time
5. Control via MQTT: cmnd/topic/ShutterPosition1 50 (50% open)
6. Physical buttons via rules for open/stop/close

Wiring for Roller Blind Motor

• L → Common terminal
• Relay 1 → Motor UP wire
• Relay 2 → Motor DOWN wire
• S1/S2 → Physical up/down buttons
• N → Neutral