# Shelly Plus 1

> ESP32-C3 based WiFi/BLE smart relay module with 16A switching capacity, dry contact input, and compact DIN-rail or in-wall form factor. Flashable with Tasmota or ESPHome for local smart home control.

## Quick Facts

- **Brand:** Shelly
- **Board Type:** relay-module
- **Price:** ~$11.99
- **Product Readiness:** consumer
- **CPU:** ESP32-C3
- **CPU Architecture:** RISC-V
- **CPU Cores:** 1
- **RAM:** 400KB SRAM
- **Flash:** 4MB
- **Power:** 100-240V AC or 12V DC
- **Operating Voltage:** 3.3V
- **Antenna:** built-in PCB antenna

## Connectivity

- **Wifi:** 802.11 b/g/n
- **Bluetooth:** BLE 5.0

## Open Source

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

## Certifications

CE, UL

## Compatible Firmware

Shelly OS, tasmota, esphome

## Use Cases

- home-automation
- smart-switch
- light-control
- garage-door
- irrigation

## Components

- **ESP32-C3** (Microcontroller): Single-core 32-bit RISC-V microcontroller at 160MHz with integrated WiFi 802.11 b/g/n and Bluetooth 5.0 LE — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32-c3_datasheet_en.pdf&ref=openhardware.directory&product=shelly-plus-1&source=md-export)
- **16A Relay** (Relay): Single-pole single-throw relay rated for 16A at 240V AC, suitable for switching most household loads including lights and small appliances — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.shelly.com%2Fen%2Fproducts%2Fshop%2Fshelly-plus-1&ref=openhardware.directory&product=shelly-plus-1&source=md-export)
- **AC-DC Converter** (Power Supply): Built-in power supply supporting 100-240V AC or 12V DC input, providing regulated 3.3V to the ESP32-C3 module — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.shelly.com%2Fen%2Fproducts%2Fshop%2Fshelly-plus-1&ref=openhardware.directory&product=shelly-plus-1&source=md-export)

## Protocols

- **WiFi 802.11 b/g/n**
- **Bluetooth 5.0 LE**
- **MQTT**
- **HTTP REST API**

## Description

# Shelly Plus 1

The Shelly Plus 1 is a compact WiFi smart relay module designed for in-wall or DIN-rail installation. Based on the ESP32-C3, it offers WiFi and Bluetooth connectivity with a 16A relay output, making it one of the most popular devices for Tasmota-based home automation.

## Key Features

- **ESP32-C3** RISC-V single-core at 160MHz with WiFi and BLE 5.0
- **16A/240V relay** — enough for most household loads
- **Dry contact input** — connect physical switches (momentary or toggle)
- **Compact form factor** — fits behind wall switches or on DIN rail
- **100-240V AC** or **12V DC** power input
- **Screw terminals** for easy wiring

## Tasmota Compatibility

- Flash via serial header (requires soldering to test pads) or via mgos-to-tasmota OTA method
- Template: `{"NAME":"Shelly Plus 1","GPIO":[0,0,0,0,192,0,0,0,0,0,0,0,0,0,0,0,0,0,0,224,0,576],"FLAG":0,"BASE":1}`
- Full relay control, switch input, and LED status via Tasmota

## Wiring Options

### As a Light Switch
- L (Line) → Switch input terminal
- Load wire → Relay output
- N (Neutral) required

### As a Dry Contact Relay
- 12V DC power input
- Relay output as potential-free dry contact
- Switch input for external trigger

## Use Cases

- Smart light switching (with existing wall switch retained)
- Garage door control
- Irrigation valve control
- Boiler/heater switching

## Where to Buy

- [Buy for $11.99](https://openhardware.directory/r?to=https%3A%2F%2Fwww.shelly.com%2Fen%2Fproducts%2Fshop%2Fshelly-plus-1&ref=openhardware.directory&product=shelly-plus-1&source=md-export)

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Fwww.shelly.com%2Fen%2Fproducts%2Fshop%2Fshelly-plus-1&ref=openhardware.directory&product=shelly-plus-1&source=md-export)
- [wiki](https://openhardware.directory/r?to=https%3A%2F%2Ftemplates.blakadder.com%2Fshelly_plus_1.html&ref=openhardware.directory&product=shelly-plus-1&source=md-export)
- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Farendst%2FTasmota&ref=openhardware.directory&product=shelly-plus-1&source=md-export)

## Tags

`esp32-c3`, `wifi`, `bluetooth`, `tasmota`, `esphome`, `relay`, `smart-switch`, `home-automation`, `shelly`, `din-rail`

## Images

![Shelly Plus 1](https://nbg1.your-objectstorage.com/openhardware-directory/entities/shelly-plus-1/a9eb39e4520b.png)
![Shelly Plus 1](https://nbg1.your-objectstorage.com/openhardware-directory/entities/shelly-plus-1/53b031faf890.jpg)
![Shelly Plus 1](https://nbg1.your-objectstorage.com/openhardware-directory/entities/shelly-plus-1/55fa8cf99c7c.jpg)
![Shelly Plus 1](https://nbg1.your-objectstorage.com/openhardware-directory/entities/shelly-plus-1/c8d5e99ec2bb.jpg)
![Shelly Plus 1](https://nbg1.your-objectstorage.com/openhardware-directory/entities/shelly-plus-1/d688e56bea03.png)
![Shelly Plus 1](https://nbg1.your-objectstorage.com/openhardware-directory/entities/shelly-plus-1/306d22f36737.jpg)

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