Olimex ESP32-C6-EVB Development Board User Manual

The ESP32-C6-EVB is a development and evaluation board featuring
4 relays, 4 opto-isolated inputs, and various connectors for
expansion modules and accessories. It is designed for easy
programming and interfacing with different sensors and
peripherals.

Product Usage Instructions:

1. First Time Setup:

To start using the ESP32-C6-EVB, follow these steps:

Connect the USB cable with USB Type C to the board.

Power the board using the 12V DC power adapter through the
power jack.
Use the ESP-PROG external USB-serial adapter to program the
ESP32-C6 or restore its firmware if needed.

2. Board Features:

The ESP32-C6-EVB features:

4 relays with status LEDs (10A/240VAC max)

4 opto-coupler inputs with status LEDs (30V DC max)
Power jack input (8-50)V DC

User LED
UEXT connectors for various accessories

3. Power Supply and Consumption:

The typical power consumption of the ESP32-C6-EVB is under 1W.
When powered by 12V DC, the current consumption is approximately
0.06A.

Frequently Asked Questions (FAQ):

Q: Can I connect additional sensors and peripherals to the
ESP32-C6-EVB?

A: Yes, you can connect various sensors, relays, LCDs, RTC, GSM,
GPS, and more accessories to the UEXT connector on the board.

Q: How do I program the ESP32-C6 on the board?

A: Use the ESP-PROG external USB-serial adapter attached to the
ESP32-C6-EVB for programming or restoring firmware.

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ESP32-C6-EVB
Revision 2.0 June 2024

User Manual
www.olimex.com

Table of Contents
INTRODUCTION……………………………………………………………………………………………………………………………..3 What is ESP32-C6-EVB?……………………………………………………………………………………………………………….3 ESP32-C6-EVB board features……………………………………………………………………………………………………….4 Order codes and links for ESP32-C6-EVB and accessories:………………………………………………………………..5 ESP32-C6 reference documents:……………………………………………………………………………………………………..6
HARDWARE…………………………………………………………………………………………………………………………………….7 ESP32-C6-EVB layout…………………………………………………………………………………………………………………..7 ESP32-C6-EVB schematic……………………………………………………………………………………………………………..8 ESP32-C6-EVB power supply and consumption:…………………………………………………………………………….10 EXT1 connector (GPIO)……………………………………………………………………………………………………………….11 UEXT connectors…………………………………………………………………………………………………………………………12 Relays…………………………………………………………………………………………………………………………………………13 Inputs…………………………………………………………………………………………………………………………………………13 User LED and button BUT1………………………………………………………………………………………………………….13 ESP32-PROG header……………………………………………………………………………………………………………………14 Jumper 3.3V_E1………………………………………………………………………………………………………………………….14
SOFTWARE……………………………………………………………………………………………………………………………………15 First time start up or how to program the board……………………………………………………………………………….15 Olimex tested firmware and examples…………………………………………………………………………………………….15
DOCUMENT REVISION…………………………………………………………………………………………………………………16
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INTRODUCTION
What is ESP32-C6-EVB?
ESP32-C6-EVB is a WIFI-enabled and Bluetooth-enabled development board that also has free GPIOs, analog, and digital inputs and outputs on boxed connector and more. ESP32-C6-EVB uses ESP32-C6, Espressif’s first Wi-Fi 6 (IEEE 802.11ax) module. It integrates 2.4 GHz Wi-Fi 6, Bluetooth 5 (LE), and the 802.15.4 low-rate wireless personal area network (LR-WPAN). ESP32-C6-EVB is perfect for stand-alone usage but can also be attached to any existing hardware project to augment it with with 2.4GHz Wi-Fi 6 and Bluetooth LE 5.3 capabilities. ESP32-C6-EVB requires only a USB cable for programming and powering; the board is equipped with USB type C connector, the type of cable used for charging most mobile phones. ESP32-C6-EVB is an Open Source Hardware project, all CAD source files are available at our GitHub repositories. Files are released under CERN Open Hardware License Version 2 strongly reciprocal and allows users to learn, study, edit, modify, manufacture, and sell same, or derivative products based on these designs. The only requirements is to open source their work under the same license. The software environment for code development is free. There are a number of different software environments that can be used for the board. Espressif chips and modules are very popular, with excellent chip documentation. The community around ESP chips is huge. This greatly eases both hardware and software development. ESP32-C6-EVB is RoHS, REACH, CE, and UKCA compliant.
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ESP32-C6-EVB board features
ESP32-C6-EVB is Open Source Hardware design with the following features: · ESP32-C6-WROOM-1-N4 module with 32-bit RISC-V single-core microprocessor, up to 160 MHz, Flash: 4MB, ROM: 320 KB, HP SRAM: 512 KB, LP SRAM: 16 KB · USB-C connector for powering, programming, and JTAG debugging · Power jack for optional external power (8-50)V DC · Four Relays: 10A/240VAC · Four opto-isolated inputs for DC voltage up to 30VDC · Two UEXT connectors (0.1″ step one and JST one) · Extension GPIO connector · Reset button · User button · Wide range of power supply: 8-50VDC · Programming connector suitable for ESP-PROG · Four mount holes · Four rubber pads included
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Order codes and links for ESP32-C6-EVB and accessories:

ESP32-C6-EVB
CABLE-USB-A-C-1M SY0612E
ESP-PROG
CABLE-IDC10-15cm JW-200×10-FM JW-200×10 JW-200×10-FF UEXT modules

ESP32-C6 development and evaluation board with 4 relays, 4 opto-isolated inputs, and more.
USB cable with USB type C and USB type A connectors, 1 meter
12V DC power adapter for external powering, compatible with the power jack of ESP32-C6-EVB; notice that it comes with European-style socket plug, if you are located in UK or USB consider PWR-EU-EK or PWR-EU-US adapter
External USB-serial adapter that can be attached to ESP32-C6-EVB and used to program the ESP32-C6, or restore its firmware
10-pin female-female UEXT cable
10 pieces female-male jumper wires for breadboarding
10 pieces male-male jumper wires for breadboarding
10 pieces female-female jumper wires for breadboarding
Different sensors, relays, LCDs, RTC, GSM, GPS etc accessories which can be connected to the UEXT connector

ESP32-C6 reference documents:
– ESP32-C6-WROOM-1U-N4 (the module used in ESP32-C6-EVB) datasheet: https://www.espressif.com/sites/default/files/documentation/esp32-c6-wroom-1_wroom-1u_datasheet_en.pdf – ESP32-C6 series (the chip in ESP32-C6-WROOM-1U-N4 and, respectively, in ESP32-C6-EVB) datasheet: https://www.espressif.com/sites/default/files/documentation/esp32-c6_datasheet_en.pdf – Getting started with ESP32-C6 and ESP-IDF software environment: https://docs.espressif.com/projects/esp-idf/en/latest/esp32c6/get-started/ – Getting started with ESP32-C6 and ESP32 package for Arduino IDE and PlatformIO software environments: https://docs.espressif.com/projects/arduino-esp32/en/latest/getting_started.html
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HARDWARE ESP32-C6-EVB layout

Power-good LED

4 x Relays with connectors and status LEDs (10A/240VAC max)

Reset button RST1

Power jack input (8-50)V DC

EXT1 header

Boot/User button BUT1

4 x Opto-coupler inputs with connectors and status LEDs (30V DC max)

User LED

UEXT1 connector 0.1″ step

USB type C for power and programming

UEXT2 connector (JST)

ESP-PROG1 header

ESP32-C6-EVB schematic
The latest ESP32-C6-EVB schematic is available on the next page. You can also download PDF export from GitHub here All design sources are available also at GitHub here
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ESP32-C6-EVB power supply and consumption:
ESP32-C6-EVB can be powered by 3 sources: · USB-C connector; · Power jack connector; · EXT1.pin1 (+5V) note that this wire is connected to the 5V of the USB so when you power ESP32C6-EVB from EXT1.pin1 you should not have USB cable attached at the same time!!!
The typical power consumption is under 1W. Current consumption of ESP32-C6-EVB is approximately 0.06A when powered by 12V DC (applied to the power jack).
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EXT1 connector (GPIO)
EXT1 pin #1 is +5V pin; it is usually used as output you can also power the board from this pins BUT ONLY IF the USB-C is not connected! It must be regulated 5V power supply, applying more than 5V will damage the board; EXT1 pin #2 is +3.3V DC output, it is not recommended to be used as input since you can’t fully power the board with 3.3V DC (relays require 5V DC); EXT1 pin #3, EXT1 pin #10 are GND pins, the board has common ground; EXT1 pin #4 is ESP_EN also known as reset; EXT1 pin #5 is GPIO0, which a free pin; EXT1 pin #6 is GPIO8USER_LED1 wired to GPIO8, notice that the user LED is on the same wire EXT1 pin #7 is GPIO9BUT1 wired to GPIO9, notice that the button is on the same wire EXT1 pin #8 and EXT1 pin #9 are GPIO16U0TXD and GPIO16U0RXD they can be used for attaching external USB-serial converter (like ESP-PROG, USB-SERIAL-CABLE-M, or BB-CH340T) to debug the board; same pins are also routed to the ESP-PROG1 header. All GPIOs operate at +3.3V levels. This means you should not connect signals with voltage higher than 3.3V to these ports as this will damage the board.
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UEXT connectors
UEXT connector stands for Universal EXTension connector and contains +3.3V output and GND power wires, and I2C, SPI, UART data signals. All signals are at 3.3V levels. ESP32-C6-EVB has two UEXT connectors UEXT1 and UEXT2, they have the same signals just different connector. UEXT1 uses 0.1″ 2.54mm step 2-row boxed plastic connector. UEXT2 uses the smallest pUEXT which is 1.0mm single row JST connector. Excerpts for UEXT1 and UEXT2 connectors can be seen below:
Olimex has developed number of extension MODULES compatible with connector UEXT1. There are temperature, humidity, pressure, magnetic field, light sensors. Modules with LCDs, extra GPIOs, LED matrices, relays, Bluetooth, GSM, GPS, RFID, RTC, EKG, etc. If you decide to use UEXT2 you might need adapter for the connector pUEXT. Expect adapter boards and wires for the JST UEXT2 connector.
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Relays
The board has 4 electro-mechanical relays for analog output, each relay has own status LED. Relay connectors have Normal open, Normal closed, and Common contacts. Relay REL1 is connected to GPIO10 Relay REL2 to GPIO11 Relay REL3 goes to GPIO22 Relay REL4 to GPIO23
Inputs
The board has 4 optocouplers for analog input and each input has own status LED. The inputs have + and printed under the connector make sure to first check the polarity or you might damage the board. Opto OPT1 is connected to GPIO1 Opto OPT2 goes to GPIO2 Opto OPT3 is routed to GPIO3 Opto OPT4 is connected to GPIO15
User LED and button BUT1
The board has user LED and a button that can be used as boot button but also can be used as user button after initial boot sequence. LED is connected to GPIO8 Button BUT1 is connected to GPIO9
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ESP32-PROG header
Used to program the board with external serial-USB programmer like (like ESP-PROG)
Jumper 3.3V_E1
ESP32-C6-EVB has a single SMT jumpers on-board. SMT jumpers are pads that can be separated (open) or soldered together (closed) to alter the hardware connections of the board and alter the behavior. The SMT jumpers require basic soldering tools and experience, to separate them you need to cut between the pads and to close them you need to solder the pads together. SMT jumpers can also be used for measuring and testing purposes. Typically you don’t need to change the positions of the jumpers to use the board. It is not recommended to alter the SMT jumpers unless you know exactly how they alter the board. 3.3V_E1 enable 3.3V input on pin #5 of ESP-PROG1 connector risky to leave 3.3V on the ESP-PROG1 connector, this might lead to short-circuit, if the board is already powered and you attach ESP-PROG. Default state: Open (no 3.3V on pin #5 of ESP-PROG1 connector).
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SOFTWARE
First time start up or how to program the board
The first time setup is pretty straight-forward and the general approach is the following:
1) Install compatible software on your computer (your computer should meet the requirements of the software); the official and recommended software is ESP-IDF; but you can also use ESP32 package for Arduino IDE
2) Attach the ESP32-C6-EVB to the computer via USB cable, the cable needs to have USB type C connector at one end and usually USB type A at the other to fit your computer; a lot of devices use similar cables so you might already have such cable at home;
3) Force the board in upload/bootloader mode manually: – Press and hold button BUT1 – Press and release button RST1 – Release button BUT1;
4) Download code. If you are unhappy with the default demos. Maybe check our ESP-IDF demo software for the relays, user LED, button Olimex ESP32-C6-EVB demo code and there is some extra info about it here in this text file;
5) After download is complete you might need to reboot the board to have the user code execute. Future downloads would require entering upload/bootloader mode again (refer to 3).
Olimex tested firmware and examples
These can be found in the repository here: https://github.com/OLIMEX/ESP32-C6-EVB
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DOCUMENT REVISION
Revision 2.0 June 2024 – minor improvements – added links to ESP32 package for Arduino Revision 1.0 August 2023 – initial release
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Documents / Resources

Olimex ESP32-C6-EVB Development Board [pdf] User Manual
ESP32-C6-EVB Development Board, ESP32-C6-EVB, Development Board, Board

References

User Manual

Olimex ESP32-C6-EVB Development Board User Manual

ESP32-C6-EVB Development Board

Specifications:

Product Information: