Circuit Documentation
Summary
This circuit involves an Arduino UNO microcontroller interfaced with three gas sensors: MQ-2, MQ135, and MQ-9 Breakout. The sensors are connected to the Arduino to measure various gas concentrations and provide analog outputs to the microcontroller for processing.
Component List
Arduino UNO
- Description: A microcontroller board based on the ATmega328P.
- Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0
MQ-2
- Description: A gas sensor that detects LPG, i-butane, propane, methane, alcohol, Hydrogen, and smoke.
- Pins: GND, VCC, ANALOG, Digital
MQ135
- Description: A gas sensor that detects NH3, NOx, alcohol, Benzene, smoke, and CO2.
- Pins: VCC, GND, A0, D0
MQ-9 Breakout
- Description: A gas sensor that detects CO and flammable gases.
- Pins: VCC, GND, DO, AO
Comment
- Description: A placeholder for comments or notes in the circuit.
- Pins: None
Wiring Details
Arduino UNO
- 3.3V: Connected to VCC of MQ-9 Breakout and MQ135
- GND: Connected to GND of MQ-2, MQ-9 Breakout, and MQ135
- A0: Connected to A0 of MQ135
- A1: Connected to ANALOG of MQ-2
- A2: Connected to AO of MQ-9 Breakout
MQ-2
- GND: Connected to GND of Arduino UNO
- VCC: Not connected
- ANALOG: Connected to A1 of Arduino UNO
- Digital: Not connected
MQ135
- VCC: Connected to 3.3V of Arduino UNO
- GND: Connected to GND of Arduino UNO
- A0: Connected to A0 of Arduino UNO
- D0: Not connected
MQ-9 Breakout
- VCC: Connected to 3.3V of Arduino UNO
- GND: Connected to GND of Arduino UNO
- DO: Not connected
- AO: Connected to A2 of Arduino UNO
Documented Code
Arduino UNO Code
void setup() {
// put your setup code here, to run once:
}
void loop() {
// put your main code here, to run repeatedly:
}
This code is a basic template for the Arduino UNO. The setup() function is where you initialize your sensors and other components, and the loop() function is where you will read the sensor values and process them.
This documentation provides a comprehensive overview of the circuit, including a summary, detailed component list, wiring details, and the initial code for the Arduino UNO.