3wire 5v fan integration?

ESPHome
1

Im trying to integrate this 5v 3wire fan. My guess is its PWM controlled for speed. but cannot get it working.

I’ve tried the output as a ledc, as below. Connected + and - to a constant 5V supply and connected the yellow wire to GPIO19. But the fan just runs very slowly.

Any ideas?

Taken straight from the ESPhome wiki.

output:
  - platform: ledc
    pin: GPIO19
    id: gpio_19

# Example usage in a light
light:
  - platform: monochromatic
    output: gpio_19
    name: "Kitchen Light"

The fan

20230827_115251
20230827_1152511920×909 66 KB

2

Third wire is usually a tachometer which measures RPM

You will need four wire version to control with PWM

I am not an expert with small fans. My next project

3

Yea I read that too,

Ok sweet i’m not too fussed about it anyway just would have been nice to integrate it if I could.

4

You can integrate but you will either need a relay for it to be on OR a module that allows control over 5v supply if you need to adjust RPM

5

Hello,
i want to say that even with 3 wires it should work and you could be able to control fa, speed, this is a part of my esphome config.

captive_portal:

sensor:

 - platform: homeassistant
   entity_id: sensor.system_monitor_processor_temperature
   id: server_temp
   accuracy_decimals: 1
   on_value_range: 

     - below:  38.0
       then:
             - logger.log: "Set fan level 33 over 30C"
             - output.set_level:
                 id: rack_fan_speed
                 level: 0%
     
     
     - above: 38.0
       below:  40.0
       then:
             - logger.log: "Set fan level 50 over 40C"
             - output.set_level:
                 id: rack_fan_speed
                 level: 50%
     

     - above: 50.0
       then:
             - logger.log: "Set fan level 100 over 50C"
             - output.set_level:
                 id: rack_fan_speed
                 level: 100%                                                                                                                                                                                                    

output:
                                                                                                                                                                 
 - platform: esp8266_pwm
   id: rack_fan_speed
   pin: 4                                                                                                                                                            
   frequency: "30000 Hz"                                                                                                                                                         
   min_power: 1%
   max_power: 100%


fan:
 - platform: speed
   output: rack_fan_speed
   name: "Override Enable"
   id: rack_fan_toggle
   on_turn_on:
    - output.set_level:
         id: rack_fan_speed
         level: !lambda |-
            return id(fan_speed_override).state/100.0;
   on_turn_off:
     - logger.log: "Power of Fan turned OFF"
     - delay: 1s
     - output.set_level:
         id: rack_fan_speed
         level: !lambda |-
           if (id(server_temp).raw_state > 50){
             return 1;}
           else if (id(server_temp).raw_state > 40){
             return 0.66;}
           else if (id(server_temp).raw_state > 30){
             return 0.33;}
           else
             return 0;
 
number:
 - platform: template
   name: "Fan Speed Override"
   id: fan_speed_override
   internal: false
   max_value: 100.0
   min_value: 0.0
   step: 33.3
   optimistic: true
   mode: slider
   on_value:
     then:
       if:
         condition:
           fan.is_on: rack_fan_toggle
         then:
         - output.set_level:
             id: rack_fan_speed
             level: !lambda "return x/100;"

web_server:
 port: 100