ESP32 AGS10 Sensor
Overview
The AGS10 is a gas sensor known for detecting a range of gases, including methane, propane, and hydrogen. Designed with stability and sensitivity, it’s suitable for industrial safety and environmental monitoring. The sensor offers a rapid response time, high sensitivity, and low power consumption, often used in applications like leak detection and air quality monitoring systems.
About AGS10 Sensor
The AGS10 is a compact and highly sensitive gas sensor designed for air quality monitoring and gas detection applications. It can detect various gases, including volatile organic compounds (VOCs), making it useful for indoor air monitoring, industrial safety, and smart home projects.
⚡ Key Features
- High Sensitivity to VOCs – Ideal for air quality monitoring and gas detection.
- Compact & Low Power – Suitable for battery-powered applications.
- Fast Response & Recovery Time – Ensures real-time gas monitoring.
- I²C Communication – Simplifies integration with ESP32 and other microcontrollers.
Where to Buy
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Technical Specifications
Pinout Configuration
The VCC pin is used to supply power to the sensor, and it typically requires 3.3V or 5V (refer to the datasheet for specific voltage requirements). The GND pin is the ground connection and must be connected to the ground of your ESP32.
Wiring with ESP32
Troubleshooting Guide
Common Issues
⚠️ CRC Error on ESP32-S2
Issue: When using the AGS10 sensor with an ESP32-S2 microcontroller, the following error is encountered: The crc check failed. This issue arises despite the sensor functioning correctly on standard ESP32 boards.
Possible causes include the AGS10 sensor's requirement for an I2C bus speed not exceeding 15kHz, which may not be properly configured on the ESP32-S2.
Solution: Ensure that the I2C bus frequency is explicitly set to 15kHz in your configuration. In ESPHome, this can be achieved by specifying frequency: 15kHz in the I2C setup. Additionally, verify that the ESP32-S2 supports the specified I2C frequency and that there are no hardware limitations affecting communication.
🔌 Connection Issues with TCA9548A Multiplexer
Issue: Integrating the AGS10 sensor with a TCA9548A I2C multiplexer in ESPHome results in configuration errors, such as: required key not provided.
Possible causes include incorrect or incomplete configuration settings in the ESPHome YAML file, particularly when defining the multiplexer channels.
Solution: Review the ESPHome configuration to ensure that all required keys and parameters are correctly specified. Each multiplexer channel should be properly defined with the necessary settings. Consulting the ESPHome documentation for guidance on configuring I2C multiplexers can provide clarity.
💻 Compilation Errors with AGS10 Library
Issue: When compiling code that includes the AGS10 sensor library, errors such as: invalid conversion from 'uint8_t' {aka 'unsigned char'} to 'uint8_t*' {aka 'unsigned char*'} occur.
Possible causes include incompatibilities in the AGS10 library when used with certain microcontrollers, such as boards other than the Arduino Uno.
Solution: Consider using a modified version of the AGS10 library that addresses these compatibility issues. For instance, a fork of the library tailored for ESP32 is available and may resolve the compilation errors.
🔧 Incorrect I2C Bus Frequency Configuration
Issue: The AGS10 sensor requires an I2C bus speed not exceeding 15kHz. Failure to configure this can lead to communication errors or sensor malfunction.
Possible causes include the default I2C bus frequency being set higher than the sensor's specifications.
Solution: Explicitly set the I2C bus frequency to 15kHz in your microcontroller's configuration. In ESPHome, this can be done by adding frequency: 15kHz to the I2C configuration section.
Debugging Tips
🔍 Serial Monitor
Use the Serial Monitor to check for error messages and verify the sensor's output. Add debug prints in your code to track the sensor's state.
⚡ Voltage Checks
Use a multimeter to verify voltage levels and check for continuity in your connections. Ensure the power supply is stable and within the sensor's requirements.
Additional Resources
Code Examples
Arduino Example
#include <Wire.h>
#define I2C_ADDRESS 0xXX // Replace with the AGS10 I2C address
#define SDA_PIN 21 // I2C SDA pin for ESP32
#define SCL_PIN 22 // I2C SCL pin for ESP32
void setup() {
Wire.begin(SDA_PIN, SCL_PIN);
Serial.begin(115200);
Serial.println("AGS10 I2C Test");
}
void loop() {
Wire.beginTransmission(I2C_ADDRESS);
Wire.write(0x00); // Example register or command
Wire.endTransmission();
Wire.requestFrom(I2C_ADDRESS, 2);
if (Wire.available() == 2) {
int highByte = Wire.read();
int lowByte = Wire.read();
int sensorValue = (highByte << 8) | lowByte;
Serial.print("Sensor Value: ");
Serial.println(sensorValue);
}
delay(1000);
}ESP-IDF Example
#include <stdio.h>
#include "driver/i2c.h"
#define I2C_MASTER_SCL_IO 22 // GPIO for SCL
#define I2C_MASTER_SDA_IO 21 // GPIO for SDA
#define I2C_MASTER_NUM I2C_NUM_1
#define I2C_MASTER_FREQ_HZ 100000
void app_main() {
i2c_config_t conf;
conf.mode = I2C_MODE_MASTER;
conf.sda_io_num = I2C_MASTER_SDA_IO;
conf.scl_io_num = I2C_MASTER_SCL_IO;
conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
conf.master.clk_speed = I2C_MASTER_FREQ_HZ;
i2c_param_config(I2C_MASTER_NUM, &conf);
i2c_driver_install(I2C_MASTER_NUM, conf.mode, 0, 0, 0);
// Add code to read from AGS10 via I2C
}i2c_param_config() and i2c_driver_install() functions set up the I2C master for communication. You can add commands to communicate with the AGS10 sensor by sending and receiving I2C data after the initialization.ESPHome Example
sensor:
- platform: ags10
tvoc:
name: TVOCPlatformIO Example
platformio.ini
[env:esp32]
platform = espressif32
board = esp32dev
framework = espidf
monitor_speed = 115200PlatformIO Example Code
#include <Wire.h>
#define I2C_ADDRESS 0xXX // Replace with the AGS10 I2C address
#define SDA_PIN 21 // I2C SDA pin for ESP32
#define SCL_PIN 22 // I2C SCL pin for ESP32
void setup() {
Wire.begin(SDA_PIN, SCL_PIN);
Serial.begin(115200);
Serial.println("AGS10 I2C Test");
}
void loop() {
Wire.beginTransmission(I2C_ADDRESS);
Wire.write(0x00); // Example register or command
Wire.endTransmission();
Wire.requestFrom(I2C_ADDRESS, 2);
if (Wire.available() == 2) {
int highByte = Wire.read();
int lowByte = Wire.read();
int sensorValue = (highByte << 8) | lowByte;
Serial.print("Sensor Value: ");
Serial.println(sensorValue);
}
delay(1000);
}platformio.ini file.MicroPython Example
from machine import I2C, Pin
from time import sleep
# Initialize I2C
i2c = I2C(0, scl=Pin(22), sda=Pin(21))
address = 0xXX # Replace with the AGS10 I2C address
while True:
# Write command and read data
i2c.writeto(address, b'\x00') # Example register or command
data = i2c.readfrom(address, 2)
# Combine high and low bytes into a 16-bit value
sensor_value = (data[0] << 8) | data[1]
print(f"Sensor Value: {sensor_value}")
sleep(1)Conclusion
The ESP32 AGS10 Sensor is a powerful Air Quality sensor that offers excellent performance and reliability. With support for multiple development platforms including Arduino, ESP-IDF, ESPHome, PlatformIO, and MicroPython, it's a versatile choice for your IoT projects.
For optimal performance, ensure proper wiring and follow the recommended configuration for your chosen development platform.
Always verify power supply requirements and pin connections before powering up your project to avoid potential damage.
