04 AZ‐touch or ArduiTouch
The AZ-touch is great for putting everything together in a nice housing, including a TFT touch display for setting pwm or target temperature. It also has a small prototyping area where you can put all the electronic parts (pullups, RC circuit, wires). You can use both the older 2.4 inch ArduiTouch or the newer 2.8 inch AZ-Touch
Pictures here are taken from the older 2.4 inch ArduiTouch
This is how everything is wired on the prototyping area of the ArduiTouch (AZ-touch is similar)
| number in picture | parts |
|---|---|
| 1 | 3.3V output from ESP32, connected to - VIN of BME280 - pullups for I2C - pullup for fan tacho |
| 2 | GND of ESP32, connected to - GND of BME280 - RC circuit for fan tacho |
| BME280 temperature sensor | |
| 3 | I2C (SCL, SDA) |
| 4 | pullups 3.3k for I2C |
| fan tacho | |
| 5 | tacho pin fan |
| 6 | pullup 10k |
| 7 | RC circuit: 3.3k, 100pF |
| 8 | esp32 input pin |
| rest of fan | |
| 9 | fan PWM |
| 10 | fan 12V |
For testing purposes, you could also use the following setup:
The ArduiTouch/AZ-touch is used for two reasons here:
- to power the fan (12V from ArduiTouch/AZ-touch is taken)
- to have a common GND for the fan and the ESP32. Otherwise you could have problems with setting fan speed via pwm or getting a correct tacho signal.
To power the ESP32, an USB cable is used. You need this anyway for flashing the firmware.