DHT22 Sensor Setup on ESP32
Thought
To read each FlexiForce as a resistive voltage divider you’ll need:
- Five 10 kΩ pull-down resistors (one per sensor)
- Five 3-pin connectors (VCC/SIG/GND) to hook up each FlexiForce
- Wire each connector’s SIG pin to a unique ESP32 ADC net
I suggest using these ADC-capable pins already in your schematic:
Table
| Sensor # | ADC Pin | Net Designator |
|---|---|---|
| 1 | IO32 | Net 18 |
| 2 | IO33 | Net 19 |
| 3 | IO34 | Net 10 |
| 4 | IO35 | Net 17 |
| 5 | IO36 | Net 7 |
For each sensor:
- Add a 3-pin terminal block (e.g. J3…J7)
- Tie pin 1 → +3V3, pin 2 → ADC net, pin 3 → GND
- Add a 10 kΩ resistor (e.g. R25…R29) between the ADC net and GND
Does that layout work for you? If so I can add those five connectors and pulldowns now.
The layout works for me. Please add the five connectors with 10kΩ pull-downs for each ADC net.
Thought
I can add those five connectors (J3–J7) and the 10 kΩ pull-down resistors (R25–R29) tied to your specified ADC nets now.
Thought
Next you’ll add one 4.7 kΩ pull-up resistor per DHT22 data line. Here’s how:
- Select a 4.7 kΩ SMD resistor (e.g. 0603, 1% or 5% tolerance).
- For each GPIO (IO4, IO16, IO17, IO21, IO22):
- Place a resistor (e.g. R20…R24)
- Connect one end to the +3V3 net
- Connect the other end to the corresponding data net ([GPIO4], [GPIO16], [GPIO17], [GPIO21], [GPIO22])
- Verify all pull-ups tie back to your +3.3 V regulator and that each DATA line has its own resistor.
Would you like me to add and wire these five pull-up resistors in your schematic now?
Proceed with pull-ups
Confirm pull-up setup
Accept pull-up addition
Yes, please add the five 4.7kΩ pull-ups using 0603 SMD resistors tied to the +3.3V net.
