Design with Adafruit CCS811 in Cirkit DesignerThe Adafruit CCS811 is an advanced gas sensor designed to detect a wide range of Volatile Organic Compounds (VOCs) and equivalent carbon dioxide (eCO2) levels. This sensor is ideal for monitoring indoor air quality in various environments such as homes, offices, and industrial spaces. The CCS811 is a digital sensor that communicates over an I2C interface, making it easy to integrate with microcontrollers like the Arduino UNO.
This circuit utilizes an ESP32 microcontroller to read from an ACS712 current sensor, a voltage sensor, and a DHT11 temperature and humidity sensor. It displays information on a 16x2 I2C LCD and controls a DC motor through a relay, with a buzzer for audible notifications. The circuit is powered by a 3.7V power source.
Open Project in Cirkit Designer
This circuit is a sensor interface system powered by a 9V battery, featuring an Arduino Mega 2560 microcontroller and an Adafruit DS1841 digital potentiometer. The circuit includes resistors and capacitors for signal conditioning, with the Arduino handling data acquisition and communication via I2C with the DS1841.
Open Project in Cirkit Designer
This circuit is a multi-sensor data acquisition system powered by a 18650 battery and managed by an ESP8266 microcontroller. It includes a load sensor interfaced with an HX711 module for weight measurement, an IR sensor, an ADXL345 accelerometer, a VL53L0X distance sensor, and a Neo 6M GPS module for location tracking. The system is designed for wireless data transmission and is supported by a TP4056 module for battery charging.
Open Project in Cirkit Designer
This circuit appears to be a multi-channel current monitoring system using several ACS712 current sensors to measure the current through different loads, likely bulbs connected to a 220V power source. The current readings from the sensors are digitized by an Adafruit ADS1115 16-bit ADC, which interfaces with an ESP32 microcontroller via I2C communication for further processing or telemetry. A buck converter is used to step down the voltage to power the ESP32 and the sensors, and the system is powered through a 2.1mm DC barrel jack, indicating it is designed for external power supply.
Open Project in Cirkit Designer| Pin Number | Pin Name | Description |
|---|---|---|
| 1 | VDD | Supply Voltage (3.3V to 5V) |
| 2 | GND | Ground |
| 3 | SDA | I2C Data |
| 4 | SCL | I2C Clock |
| 5 | WAKE | Wake Pin (active low) |
| 6 | INT | Interrupt Pin |
| 7 | RST | Reset Pin (active low) |
| 8 | ADDR | I2C Address Select (float or connect to GND) |
#include <Wire.h>
#include <Adafruit_CCS811.h>
Adafruit_CCS811 ccs;
void setup() {
Serial.begin(9600);
Wire.begin();
// Initialize the sensor
if (!ccs.begin()) {
Serial.println("Failed to start sensor! Please check your wiring.");
while (1);
}
// Wait for the sensor to be ready
while (!ccs.available());
}
void loop() {
// Read sensor data when available
if (ccs.available()) {
if (!ccs.readData()) {
Serial.print("CO2: ");
Serial.print(ccs.geteCO2());
Serial.print("ppm, TVOC: ");
Serial.print(ccs.getTVOC());
Serial.println("ppb");
} else {
Serial.println("ERROR!");
// If reading the sensor data failed, print an error message
}
}
delay(500); // Wait for 500 ms before reading again
}
Q: Can the CCS811 sensor measure CO2 directly? A: No, the CCS811 measures eCO2 levels, which are calculated based on detected VOCs and not a direct measurement of CO2.
Q: How long does the sensor need to preheat? A: The sensor should preheat for at least 20 minutes upon first use or after a prolonged period of inactivity.
Q: Is the sensor compatible with 5V logic? A: The sensor can be powered by 5V, but the logic level for I2C communication is 3.3V. Use level shifters if necessary.
Q: Can I use multiple CCS811 sensors on the same I2C bus? A: Yes, but you will need to set different I2C addresses using the ADDR pin for each sensor.