ESP32-C61 Pinout

Overview

The ESP32-C61 launched after this site’s existing photo and diagram library was put together, so there’s no product photo or illustrated pinout diagram here yet, only verified spec and GPIO tables sourced directly from the official datasheet. Despite being a very recent chip, the datasheet is already a released, non-preliminary v1.1, not a draft.

No 802.15.4 radio on this chip, so Thread and Zigbee aren’t possible here: that needs an ESP32-C6 or C5 instead. It’s easy to assume otherwise since the name looks similar to the C6, but this is a plain Wi-Fi 6 + Bluetooth part, not a Thread/Zigbee one.

Getting started

Board support for such a new chip can lag behind the official Arduino/ESP-IDF releases, check your installed ESP32 board package version supports the C61 before assuming a problem is your wiring.

Hello World: blink an LED

The microcontroller equivalent of “Hello World”: GPIO24 toggles once a second, shown here in two different environments. Wire an LED (with a resistor) to GPIO24, a plain general-purpose pin with no other job on this chip.

#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"

#define LED_PIN GPIO_NUM_24

void app_main(void)
{
    gpio_reset_pin(LED_PIN);
    gpio_set_direction(LED_PIN, GPIO_MODE_OUTPUT);

    while (1) {
        gpio_set_level(LED_PIN, 1);
        vTaskDelay(pdMS_TO_TICKS(1000));
        gpio_set_level(LED_PIN, 0);
        vTaskDelay(pdMS_TO_TICKS(1000));
    }
}

#define LED_PIN 24

void setup() {
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  digitalWrite(LED_PIN, HIGH);
  delay(1000);
  digitalWrite(LED_PIN, LOW);
  delay(1000);
}

ESP-IDF: build and flash with idf.py build flash monitor. Arduino IDE: install ESP32 board support first, see “Getting started” above.

Specifications

Official Espressif specifications for the ESP32-C61 chip and the ESP32-C61-WROOM-1 module.

No illustrated pinout diagram yet, this chip is too new for this site’s asset library. The module itself has the same footprint as the WROOM-32D and the C6-WROOM-1: 18 by 25.5 by 3.1 mm.

GPIO quick reference

This is the full chip-level pin list. A specific WROOM-1 board may not break out every one of these to a header pin.

Flashing pins (UART0)

Used by a USB-to-serial adapter (or the onboard one) to upload firmware.

Safety notes