# Sonoff Dual R3

> ESP32-based dual-relay WiFi smart switch with per-channel power monitoring, roller shutter mode, and 2×10A outputs. Ideal for motorized blinds with Tasmota shutter calibration and position tracking.

## Quick Facts

- **Brand:** Sonoff
- **Board Type:** relay-module
- **Price:** ~$14.9
- **Product Readiness:** consumer
- **CPU:** ESP32
- **CPU Architecture:** Xtensa LX6
- **CPU Cores:** 2
- **RAM:** 520KB SRAM
- **Flash:** 4MB
- **Power:** 100-240V AC
- **Operating Voltage:** 3.3V
- **Antenna:** built-in PCB antenna

## Connectivity

- **Wifi:** 802.11 b/g/n
- **Bluetooth:** BLE 4.2

## Open Source

- **Firmware:** No
- **Schematics:** No
- **PCB Layout:** No

## Compatible Firmware

eWeLink, tasmota

## Use Cases

- roller-blind-control
- shutter-control
- dual-light-control
- motor-control
- power-monitoring
- home-automation

## Components

- **ESP32** (Microcontroller): Dual-core Xtensa LX6 microcontroller at 240MHz with integrated WiFi 802.11 b/g/n and Bluetooth 4.2 — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32_datasheet_en.pdf&ref=openhardware.directory&product=sonoff-dual-r3&source=md-export)
- **2x 10A Relay** (Relay): Two independent single-pole relays each rated at 10A/240V AC, with interlock mode for motor direction control — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fitead.cc%2Fproduct%2Fsonoff-dualr3%2F&ref=openhardware.directory&product=sonoff-dual-r3&source=md-export)
- **CSE7761** (Sensor): Dual-channel single-phase energy measurement chip providing per-channel voltage, current, and active power readings — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fitead.cc%2Fproduct%2Fsonoff-dualr3%2F&ref=openhardware.directory&product=sonoff-dual-r3&source=md-export)

## Protocols

- **WiFi 802.11 b/g/n**
- **Bluetooth 4.2**
- **MQTT**
- **UART**

## Description

# 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

## Where to Buy

- [Buy for $14.9](https://openhardware.directory/r?to=https%3A%2F%2Fitead.cc%2Fproduct%2Fsonoff-dualr3%2F&ref=openhardware.directory&product=sonoff-dual-r3&source=md-export)

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Fitead.cc%2Fproduct%2Fsonoff-dualr3%2F&ref=openhardware.directory&product=sonoff-dual-r3&source=md-export)
- [wiki](https://openhardware.directory/r?to=https%3A%2F%2Ftemplates.blakadder.com%2Fsonoff_DUALR3.html&ref=openhardware.directory&product=sonoff-dual-r3&source=md-export)
- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Farendst%2FTasmota&ref=openhardware.directory&product=sonoff-dual-r3&source=md-export)

## Tags

`esp32`, `wifi`, `tasmota`, `dual-relay`, `shutter-control`, `roller-blind`, `power-monitoring`, `home-automation`, `sonoff`, `motor-control`

## Images

![Sonoff Dual R3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/sonoff-dual-r3/062e47af4f77.png)
![Sonoff Dual R3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/sonoff-dual-r3/55ef3b22cafe.jpg)
![Sonoff Dual R3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/sonoff-dual-r3/fe11b94058ab.jpg)
![Sonoff Dual R3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/sonoff-dual-r3/3a03d2e1ea72.jpg)
![Sonoff Dual R3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/sonoff-dual-r3/8286647d8ec7.jpg)

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