MQ-9 Sensor Inquiry
Thought for 1 min 30 sec
Here’s the net‐list for your external sensor board. Each net shows the connector pin and all sensor/LED pins that tie to it:
Table
| Net | Connections |
|---|---|
| 5 V | CN1 Pin 1, U1 VCC_heater, U5 VCC, LED1 Anode, LED2 Anode |
| 3.3 V | CN1 Pin 2, U2 VCC, U3 VCC, U4 VCC |
| GND | CN1 Pin 3 & Pin 4, U1 GND, U2 GND, U3 GND, U4 GND, U5 GND, LED1 Cathode, LED2 Cathode |
| SDA | CN1 Pin 5, U2 SDA, U3 SDA |
| SCL | CN1 Pin 6, U2 SCL, U3 SCL |
| MOSI | CN1 Pin 7, U4 MOSI |
| MISO | CN1 Pin 8, U4 MISO |
| SCK | CN1 Pin 9, U4 SCK |
| SS | CN1 Pin 10, U4 NSS/SS |
| TX | CN1 Pin 11, U5 RX |
| RX | CN1 Pin 12, U5 TX |
| EN | CN1 Pin 13, goes to your main‐board MCU enable control |
Let me know if you’d like me to implement these net connections in your Flux schematic.
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0:02
which pin of LED is anode? upper or lower
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