# Olimex ESP32-C6-EVB

> Open-source hardware evaluation board with ESP32-C6, 4 mains-rated relays, 4 opto-isolated inputs, and WiFi 6/Thread/Zigbee/Matter connectivity for home and industrial automation.

## Quick Facts

- **Brand:** Olimex
- **Board Type:** dev-board
- **Price:** ~$14
- **Product Readiness:** consumer
- **CPU:** RISC-V single-core @ 160MHz
- **CPU Architecture:** RISC-V RV32IMAC
- **CPU Cores:** 1
- **RAM:** 512KB HP SRAM + 16KB LP SRAM
- **Flash:** 4MB
- **USB:** USB-C (power + JTAG)
- **Power:** USB-C or 8-50V DC jack
- **Operating Voltage:** 3.3V
- **Operating Temp:** -40°C to +85°C
- **Dimensions:** 100 × 70mm
- **Antenna:** Built-in PCB antenna

## Connectivity

- **Wifi:** 802.11ax (WiFi 6)
- **Bluetooth:** BLE 5.0
- **Thread:** Thread 1.3
- **Zigbee:** Zigbee 3.0
- **Matter:** Matter over Thread

## Open Source

- **Firmware:** Yes
- **Schematics:** Yes
- **PCB Layout:** Yes

## Compatible Firmware

arduino, esp-idf, esphome, tasmota

## Use Cases

- smart-home
- home-automation
- smart-plug
- smart-switch
- industrial-automation
- matter-smart-home
- matter-smart-home

## Components

- **ESP32-C6-WROOM-1-N4** (mcu): Espressif ESP32-C6-WROOM-1-N4 module with RISC-V @ 160MHz, 4MB flash, WiFi 6, BLE 5, and IEEE 802.15.4 for Thread/Zigbee/Matter. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32-c6-wroom-1_wroom-1u_datasheet_en.pdf&ref=openhardware.directory&product=olimex-esp32-c6-evb&source=md-export)
- **relay** (relay): Four electromechanical relays rated 10A at 240VAC for switching mains-voltage loads. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FOLIMEX%2FESP32-C6-EVB&ref=openhardware.directory&product=olimex-esp32-c6-evb&source=md-export)

## Protocols

- **UEXT**: 
- **I2C**: 
- **SPI**: 
- **UART**: 

## GPIO Map

| Pin | Name | Type | Functions |
|-----|------|------|-----------|
| RELAY1 | Relay 1 control | — | digital-output |
| RELAY2 | Relay 2 control | — | digital-output |
| RELAY3 | Relay 3 control | — | digital-output |
| RELAY4 | Relay 4 control | — | digital-output |
| IN1 | Opto-isolated input 1 | — | digital-input |
| IN2 | Opto-isolated input 2 | — | digital-input |
| IN3 | Opto-isolated input 3 | — | digital-input |
| IN4 | Opto-isolated input 4 | — | digital-input |

## Available Software

- **[arduino]()** (open-source)
- **[ESP-IDF]()** (open-source)
- **[esphome]()** (open-source)

## Description

## Overview

The Olimex ESP32-C6-EVB is a CERN Open Hardware certified evaluation board designed for home automation and industrial control applications. Built around the Espressif ESP32-C6-WROOM-1-N4 module, it combines WiFi 6, BLE 5, Zigbee, Thread, and Matter connectivity with four mains-rated electromechanical relays and four opto-isolated digital inputs on a single board.

The four relays are rated for 10A at 240VAC, making them suitable for switching lighting circuits, heating elements, motors, and other household or industrial loads directly. The four opto-isolated inputs accept voltages up to 30VDC, providing safe interfacing to external sensors, switches, or PLC outputs without risk to the main board.

Powered by the ESP32-C6 RISC-V SoC running at up to 160MHz with 4MB flash and 512KB SRAM, the board supports programming via ESP-IDF and Arduino IDE. The USB-C port doubles as a JTAG debug interface. An 8–50V DC power jack allows powering the board directly from industrial power supplies or 12V/24V systems.

Full hardware design files — schematics, KiCad sources, and Gerbers — are available on GitHub under OSHW certification (UID BG0000116), making this one of the few truly open-source hardware relay boards with Matter support.

## Where to Buy

- [Olimex](https://openhardware.directory/r?to=https%3A%2F%2Fwww.olimex.com%2FProducts%2FIoT%2FESP32-C6%2FESP32-C6-EVB%2F&ref=openhardware.directory&product=olimex-esp32-c6-evb&source=md-export) — 12.95

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Fwww.olimex.com%2FProducts%2FIoT%2FESP32-C6%2FESP32-C6-EVB%2Fopen-source-hardware&ref=openhardware.directory&product=olimex-esp32-c6-evb&source=md-export)
- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FOLIMEX%2FESP32-C6-EVB&ref=openhardware.directory&product=olimex-esp32-c6-evb&source=md-export)

## Tags

`matter`, `thread`, `zigbee`, `wifi6`, `esp32-c6`, `relay`, `industrial`, `open-hardware`, `cern-ohl`, `home-automation`

## Images

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