A beelogger on ESP32 basis, part 6: Test setup: The wind speed sensor (anemometer)

I bought a wind speed sensor from china, it’s a spare part for the “misol” weather stations, just search for “wind speed misol sensor aliexpress” for the product, it was less than 15€.

I unscrewed it to see how it works, technically it’s just a hall sensor.

For my test-setup, I simply cut off the connector and connected the wires directly to GND and GPIO4 and used the internal pull-up resistor:

Adding it to esphome is straight forward and easy. I’m using the pulse counter component, it uses the pulse counter peripheral of the ESP32 and works in standby-modes:

substitutions:
  update_interval: 5s

sensor:
 - platform: pulse_counter
   name: "Wind Speed Counter"
   id: windspeed_pulse_counter
   use_pcnt: true
   count_mode: 
     falling_edge: INCREMENT
     rising_edge: DISABLE
   pin:
     number: GPIO4
     inverted: true
     mode:
       input: true
       pullup: true
   unit_of_measurement: "km/h"
   icon: "mdi:windsock"
   update_interval: ${update_interval}
   filters:
     - multiply: 0.04
     - debounce: 10ms
   total:
     name: "Wind Speed Counter Total Pulses"

The value “0.04” is 2.4kmh/60s (to convert it from esphome’s pulses/min to km/h). The value 2.4km/h is explained here in the datasheets I found in this wiki that seem to match my hardware:
datasheet_1
datasheet_2