ESP32 ENS160 Digital Metal-Oxide Multi-Gas Sensor

Code Examples

Below you can find code examples of ENS160 Digital Metal-Oxide Multi-Gas Sensor with ESP32 in several frameworks:

• Arduino IDE
• ESP-IDF
• ESPHome
• PlatformIO
• MicroPython

ESP32 ENS160 Arduino IDE Code Example

Example in Arduino IDE

Fill in your main Arduino IDE sketch file with the following code to use the ENS160 Digital Metal-Oxide Multi-Gas Sensor:

#include <Wire.h>
#include "ScioSense_ENS160.h"

ScioSense_ENS160 ens160(ENS160_I2CADDR_1); // I²C address 0x53

void setup() {
    Serial.begin(115200);
    Wire.begin();
    if (!ens160.begin()) {
        Serial.println("Failed to initialize ENS160 sensor!");
        while (1);
    }
}

void loop() {
    ens160.readData();
    Serial.print("eCO2: ");
    Serial.print(ens160.geteCO2());
    Serial.print(" ppm, TVOC: ");
    Serial.print(ens160.getTVOC());
    Serial.print(" ppb, AQI: ");
    Serial.println(ens160.getAQI());
    delay(1000);
}

This Arduino sketch interfaces with the ENS160 sensor over I²C. It initializes the sensor using the ScioSense_ENS160 library with the I²C address set to 0x53. In the setup() function, the sensor is initialized, and an error message is displayed if initialization fails. The loop() function reads eCO₂, TVOC, and AQI data from the sensor every second and prints the values to the Serial Monitor.

Connect your ESP32 to your computer via a USB cable, Ensure the correct Board and Port are selected under Tools, Click the "Upload" button in the Arduino IDE to compile and upload the code to your ESP32.

ESP32 ENS160 ESP-IDF Code Example

Example in Espressif IoT Framework (ESP-IDF)

If you're using ESP-IDF to work with the ENS160 Digital Metal-Oxide Multi-Gas Sensor, here's how you can set it up and read data from the sensor. Fill in this code in the main ESP-IDF file:

#include <stdio.h>
#include "driver/i2c.h"
#include "ens160.h"

#define I2C_MASTER_SCL_IO 22
#define I2C_MASTER_SDA_IO 21
#define I2C_MASTER_NUM I2C_NUM_0
#define I2C_MASTER_FREQ_HZ 100000

void app_main(void) {
    i2c_config_t i2c_config = {
        .mode = I2C_MODE_MASTER,
        .sda_io_num = I2C_MASTER_SDA_IO,
        .scl_io_num = I2C_MASTER_SCL_IO,
        .sda_pullup_en = GPIO_PULLUP_ENABLE,
        .scl_pullup_en = GPIO_PULLUP_ENABLE,
        .master.clk_speed = I2C_MASTER_FREQ_HZ
    };
    i2c_param_config(I2C_MASTER_NUM, &i2c_config);
    i2c_driver_install(I2C_MASTER_NUM, I2C_MODE_MASTER, 0, 0, 0);

    ens160_t sensor;
    ens160_init(&sensor, I2C_MASTER_NUM, ENS160_I2C_ADDRESS_1);

    printf("Initializing ENS160\n");
    if (ens160_start(&sensor) != ENS160_OK) {
        printf("Failed to start ENS160 sensor\n");
        return;
    }

    while (1) {
        uint16_t eco2, tvoc;
        uint8_t aqi;
        if (ens160_read_data(&sensor, &eco2, &tvoc, &aqi) == ENS160_OK) {
            printf("eCO2: %d ppm, TVOC: %d ppb, AQI: %d\n", eco2, tvoc, aqi);
        } else {
            printf("Error reading data from ENS160\n");
        }
        vTaskDelay(pdMS_TO_TICKS(1000));
    }
}

This ESP-IDF example interfaces with the ENS160 sensor over I²C using SDA (GPIO21) and SCL (GPIO22). The I²C bus is initialized with the appropriate configuration, and the ENS160 is configured to start data acquisition. In the main loop, eCO₂, TVOC, and AQI values are read every second and printed to the console. Any errors during communication are handled with error messages.

Update the I2C pins (I2C_MASTER_SDA_IO and I2C_MASTER_SCL_IO) to match your ESP32 hardware setup, Use idf.py build to compile the project, Use idf.py flash to upload the code to your ESP32.

ESP32 ENS160 ESPHome Code Example

Example in ESPHome (Home Assistant)

Fill in this configuration in your ESPHome YAML configuration file (example.yml) to integrate the ENS160 Digital Metal-Oxide Multi-Gas Sensor

i2c:
  sda: GPIO21
  scl: GPIO22

sensor:
  - platform: ens160
    eco2:
      name: "eCO2"
    tvoc:
      name: "TVOC"
    aqi:
      name: "Air Quality Index"
    address: 0x53
    update_interval: 1s

The ESPHome configuration sets up I²C communication with the ENS160 sensor using SDA (GPIO21) and SCL (GPIO22). The sensor platform fetches eCO₂, TVOC, and AQI data at 1-second intervals. The data is displayed as named sensors: 'eCO2', 'TVOC', and 'Air Quality Index'. The I²C address is set to 0x53.

Upload this code to your ESP32 using the ESPHome dashboard or the esphome run command.

ESP32 ENS160 PlatformIO Code Example

Example in PlatformIO Framework

For PlatformIO, make sure to configure the platformio.ini file with the appropriate environment and libraries, and then proceed with the code.

Configure platformio.ini

First, your platformio.ini should look like below. You might need to include some libraries as shown. Make sure to change the board to your ESP32:

[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200

ESP32 ENS160 PlatformIO Example Code

Write this code in your PlatformIO project under the src/main.cpp file to use the ENS160 Digital Metal-Oxide Multi-Gas Sensor:

#include <Wire.h>
#include "ScioSense_ENS160.h"

ScioSense_ENS160 ens160(ENS160_I2CADDR_1); // I²C address 0x53

void setup() {
    Serial.begin(115200);
    Wire.begin(21, 22); // SDA: GPIO21, SCL: GPIO22
    if (!ens160.begin()) {
        Serial.println("Failed to initialize ENS160 sensor!");
        while (1);
    }
}

void loop() {
    ens160.readData();
    Serial.print("eCO2: ");
    Serial.print(ens160.geteCO2());
    Serial.print(" ppm, TVOC: ");
    Serial.print(ens160.getTVOC());
    Serial.print(" ppb, AQI: ");
    Serial.println(ens160.getAQI());
    delay(1000);
}

This PlatformIO example interfaces with the ENS160 sensor using SDA (GPIO21) and SCL (GPIO22). The sensor is initialized with the I²C address set to 0x53. eCO₂, TVOC, and AQI values are retrieved in the loop() and printed to the Serial Monitor every second.

Upload the code to your ESP32 using the PlatformIO "Upload" button in your IDE or the pio run --target upload command.

ESP32 ENS160 MicroPython Code Example

Example in Micro Python Framework

Fill in this script in your MicroPython main.py file (main.py) to integrate the ENS160 Digital Metal-Oxide Multi-Gas Sensor with your ESP32.

from machine import I2C, Pin
import time

# ENS160 I2C address
ENS160_ADDR = 0x53

# Register addresses
DATA_ECO2 = 0x22
DATA_TVOC = 0x24
DATA_AQI = 0x26

# Initialize I2C
i2c = I2C(0, scl=Pin(22), sda=Pin(21))

# Function to read 16-bit register
def read_register(addr, reg):
    data = i2c.readfrom_mem(addr, reg, 2)
    return (data[0] << 8) | data[1]

while True:
    eco2 = read_register(ENS160_ADDR, DATA_ECO2)
    tvoc = read_register(ENS160_ADDR, DATA_TVOC)
    aqi = i2c.readfrom_mem(ENS160_ADDR, DATA_AQI, 1)[0]

    print(f"eCO2: {eco2} ppm, TVOC: {tvoc} ppb, AQI: {aqi}")
    time.sleep(1)

This MicroPython script interfaces with the ENS160 sensor over I²C using SDA (GPIO21) and SCL (GPIO22). It reads eCO₂, TVOC, and AQI data by accessing the corresponding registers. The read_register() function retrieves 16-bit data from the sensor. The main loop continuously fetches and prints the sensor values every second.

Upload this code to your ESP32 using a MicroPython-compatible IDE, such as Thonny, uPyCraft, or tools like ampy.