Published July 28, 2021 © GPL3+

Infrared sensing automatic fan

Use Pico and Grove make an auto-sensing fan, when you wave your hand you can control the servo and the fan to turn at the same time.

BeginnerFull instructions provided30 minutes1,470

Things used in this project

Hardware components

Raspberry Pi Pico

Seeed Studio Grove Shield for Pi Pico

Seeed Studio Grove Servo

Seeed Studio Grove - Mini Fan v1.1

Seeed Studio Grove - mini PIR motion sensor

Software apps and online services

Thonny

Story

This is a simple project to get started with Pico and Grove, using MicroPytho to control both PWM signals and high and low level signals.

Step 1. Connect Grove servo to analog pin 1 of Base Shield.
Step 2. Connect Grove Mini fan to port D16 of Base Shield.
Step 3. Connect Grove Mini pir motion sensor to port D18 of Base Shield.
Step 4. Plug Grove Shield for Pi Pico into Pi Pico.
Step 5. Connect Pi Pico to PC through a USB cable.

Then copy the code to the Thonny IDE.

Now please click the green button to run the demo code. Then you can get the grove mini fan and grove servo run When you hands swiping past the pir sensor as below.

code

from machine import Pin,ADC,PWM
from time import sleep
import utime
 
miniFun = Pin(16, Pin.OUT)  
miniPir = Pin(18, Pin.IN)  
 
pwm_Servo=PWM(Pin(27))
pwm_Servo.freq(500)
Servo_Val =0  
 
while True:
 
    if  miniPir.value() == 1 :
        miniFun.value(1)
 
        while  Servo_Val<65535:
            Servo_Val=Servo_Val+50
            utime.sleep_ms(1)
            pwm_Servo.duty_u16(Servo_Val)
        while Servo_Val>0: 
            Servo_Val=Servo_Val-50
            utime.sleep_ms(1)
            pwm_Servo.duty_u16(Servo_Val)
 
    else :
        miniFun.value(0)
 
        pwm_Servo.duty_u16(0)