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how do I connect U1 and U2?
vissoni

vissoni

@copilot how do I connect U1 and U2?
2y

copilot

To connect the Arduino Nano (U1) and the MQ-3 gas sensor (U2), you'll need to consider the MQ-3's functionality and the Arduino's I/O capabilities. The MQ-3 sensor is designed for detecting alcohol vapor, and it provides both digital and analog outputs. Here, we will focus on a simple analog connection, as it's a common way to interface the MQ-3 with the Arduino Nano for reading alcohol vapor levels.
Given the pins on U2:
  • B1 and B2 are the heater pins that require a supply voltage.
  • VH+ and VH- are used for supplying the heating voltage to the sensor.
  • A1 is the analog output.
  • A2 remains unconnected as it's typically used for adjusting sensitivity, often left unconnected or connected through a variable resistor to ground in some applications.
The MQ-3 requires a 5V supply for heating and for its internal electronics, so here's how you could connect it to the Arduino Nano (U1):
  • Heater Supply: The MQ-3's heater needs to be powered to preheat before it can provide accurate readings. This requires approximately 5V.
    • Connect U2:B1 to U1:+5V (This provides power for the heater).
    • Connect U2:B2 to U1:COM/GND__1 (Ground for the heater).
  • Sensor Power Supply: Besides the heater, the sensor electronics itself also need a 5V supply.
    • Connect U2:VH+ to U1:+5V (Power supply for the sensor electronics).
    • Connect U2:VH- to U1:COM/GND__1 (Ground for the sensor electronics).
  • Reading Sensor Output: The MQ-3's analog output will vary proportionally with the presence of alcohol vapor in the air.
    • Connect U2:A1 to one of the analog input pins on the Arduino Nano, say U1:A0 (to read the analog sensor output).
By connecting the MQ-3 to the Arduino Nano in this manner, you can use the Arduino to read the analog voltage output from the MQ-3 sensor, which reflects the concentration of alcohol vapor in the air. Here is the connection list summarized:
  • Connect U2:B1 to U1:+5V.
  • Connect U2:B2 to U1:COM/GND__1.
  • Connect U2:VH+ to U1:+5V.
  • Connect U2:VH- to U1:COM/GND__1.
  • Connect U2:A1 to U1:A0.
This setup will provide power to both the MQ-3 sensor and its heater, and enable the Arduino Nano to read the concentration of alcohol vapor. It's also advisable to check the datasheet of the MQ-3 sensor for any specifics regarding preheating time and calibration.
2y
1
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