The NDIR C8 is a non-dispersive infrared (NDIR) sensor designed for measuring carbon dioxide (CO2) concentrations in various environments. It operates by detecting the specific infrared wavelengths absorbed by CO2 molecules, ensuring accurate and reliable readings. This sensor is widely used in applications such as air quality monitoring, HVAC systems, industrial safety, and greenhouse management. Its robust design and high sensitivity make it suitable for both indoor and outdoor environments.
This circuit is designed for CO2 monitoring and wireless data transmission. It uses an Arduino Pro Mini to read CO2 levels from a SenseAir S8 CO2 sensor and transmit the data via a LoRa Ra-02 SX1278 module. A step-up boost power converter is used to adjust the voltage for the Arduino and sensor, powered by an 18650 battery.
Open Project in Cirkit Designer
This IoT indoor air quality monitoring circuit uses an ESP32 microcontroller to read data from a DHT22 temperature and humidity sensor, an MQ-7 carbon monoxide sensor, and a PM2.5 air quality sensor. The collected data is displayed on a 128x64 OLED display, and an RGB LED and PWM fan are controlled based on the air quality readings to indicate and manage air quality levels.
Open Project in Cirkit Designer
This circuit is designed to monitor CO2 levels in an environment using a SenseAir S8 CO2 sensor, with an ESP-8266 microcontroller handling data processing and communication. The ESP-8266 controls three LEDs (red, yellow, green) and a buzzer as indicators of CO2 concentration levels, and it is programmed to send CO2 data to a ThingSpeak server for remote monitoring. A push switch is connected to the reset pin of the ESP-8266 for manual resetting of the microcontroller.
Open Project in Cirkit Designer
This circuit features an ESP32 microcontroller interfaced with a 0.96" OLED display and an ME2-CO carbon monoxide sensor. The ESP32 reads data from the CO sensor and displays the information on the OLED screen, providing a compact solution for monitoring CO levels.
Open Project in Cirkit DesignerBelow are the key technical details and pin configuration for the NDIR C8 CO2 sensor:
| Parameter | Value |
|---|---|
| Measurement Range | 0 - 5000 ppm (parts per million) |
| Accuracy | ±50 ppm or ±3% of reading |
| Operating Voltage | 4.5V - 5.5V |
| Operating Current | < 50 mA |
| Communication Interface | UART (TTL level) |
| Warm-Up Time | < 3 minutes |
| Operating Temperature | -10°C to 50°C |
| Operating Humidity | 0% - 95% RH (non-condensing) |
| Dimensions | 33 mm x 20 mm x 9 mm |
| Pin Number | Pin Name | Description |
|---|---|---|
| 1 | VCC | Power supply input (4.5V - 5.5V) |
| 2 | GND | Ground connection |
| 3 | TXD | UART Transmit pin (data output) |
| 4 | RXD | UART Receive pin (data input) |
VCC pin to a 5V power source and the GND pin to the ground of your circuit.TXD and RXD pins to establish UART communication with a microcontroller or computer. Ensure the UART voltage levels are compatible (TTL level).TXD pin. Use a microcontroller to read and process this data.Below is an example of how to connect and use the NDIR C8 CO2 sensor with an Arduino UNO:
| NDIR C8 Pin | Arduino UNO Pin |
|---|---|
| VCC | 5V |
| GND | GND |
| TXD | RX (Pin 0) |
| RXD | TX (Pin 1) |
#include <SoftwareSerial.h>
// Define RX and TX pins for SoftwareSerial
SoftwareSerial mySerial(10, 11); // RX = Pin 10, TX = Pin 11
void setup() {
Serial.begin(9600); // Initialize Serial Monitor
mySerial.begin(9600); // Initialize SoftwareSerial for NDIR C8
Serial.println("NDIR C8 CO2 Sensor Initialized");
}
void loop() {
if (mySerial.available()) {
// Read data from the sensor
String co2Data = "";
while (mySerial.available()) {
char c = mySerial.read();
co2Data += c;
}
// Print the received CO2 data to the Serial Monitor
Serial.println("CO2 Concentration: " + co2Data + " ppm");
}
delay(1000); // Wait 1 second before the next reading
}
SoftwareSerial if the Arduino's hardware UART pins (0 and 1) are already in use.No Data Output:
Inaccurate Readings:
Sensor Not Responding:
Interference from Other Devices:
Q: Can the NDIR C8 measure CO2 concentrations above 5000 ppm?
A: No, the sensor's maximum measurement range is 5000 ppm. For higher concentrations, consider using a sensor with a wider range.
Q: How often should I calibrate the sensor?
A: Calibration frequency depends on the application. For critical applications, calibrate every 6-12 months.
Q: Can I use the NDIR C8 outdoors?
A: Yes, but ensure the sensor is protected from direct exposure to water and extreme temperatures.
Q: What is the lifespan of the NDIR C8 sensor?
A: The sensor typically has a lifespan of 5-10 years, depending on usage and environmental conditions.