RASPBERRY PI FAN CONTROL HOW TO
RASPBERRY PI FAN CONTROL PORTABLE
RASPBERRY PI FAN CONTROL CODE

Some of these pins perform some special functions. But out of 40, only 26 GPIO pins (GPIO2 to GPIO27) can be programmed. There are 40 GPIO output pins in Raspberry Pi 2. We have discussed about PWM in the previous tutorial. PWM (Pulse Width Modulation) is a method used for getting variable voltage out of constant power source. In this tutorial we will Control the Speed of a DC motor using Raspberry Pi and PWM technique. We have discussed LED Blinky, Button Interfacing and PWM generation in previous tutorials. Moreover, you could try to use GPIO to output PMW to control the speed of the fan, ref. We can test whether it is added to the list: sudo service -status-allДЇinally we need to reboot the Raspberry Pi to make the changes effective: sudo rebootДЄfter finish the testing, you can solder things up and put them into the case to make it prettier. # use the following to remove the service Sudo update-rc.d fan defaults 90 # 90 stands for priority, larger the number, later it will be executed

Make it running after reboot: cd /etc/init.d/ Sudo service fan status # check service status Sudo service fan restart # restart the service

Use the following command to control the fan service: sudo service fan start # start the service Then we make it executable: chmod +x /etc/init.d/fan Kill $(ps aux | grep -m 1 'python /home/pi/Scripts/fan.py' | awk '') # Description: Fan controller auto start after boot

RASPBERRY PI FAN CONTROL HOW TO

You can create a bash alias for this execution command, but here I'm going to show you how to add this script as a service to your Raspberry Pi and make it running after every time we reboot.Д¬reate a service file under /etc/init.d called fan, so the file path looks like /etc/init.d/fan, edit the file and paste the following: #!/bin/bash The only problem is we have to execute the command to run it every time we reboot the system. Now the script is working, it will monitor the temperature of the CPU, then turn on/off the fan base on the threshold degrees we set. We can test it by execute python /home/pi/Scripts/fan.py, you can see the log in the terminal. If temp < 48.0: # lower bound to turn off the fan If temp > 55.0: # upper bound to turn on the fan With open('/sys/class/thermal/thermal_zone0/temp', 'r') as f: # define the GPIO to control the transistor's B pin GPIO reference: Notes for Raspberry Pi #!/usr/bin/python If you didn't wire the jumper wires as I did, modify the GPIO accordingly.

RASPBERRY PI FAN CONTROL CODE

We simply use the code for blink a LED from gpiozero package to control the GPIO, documentation. We use Python to control the GPIO, and set the script to run after the Raspberry Pi system boot.ДЇirst, create a Python file in /home/pi/Scripts/, name as fan.py. Here is a good explanation of a transistor's pins: NPN 2N222 Transistor.with schematic tutorial Raspberry Pi Fan Control Wire Actual wire Code Make sure the E is connected to the positive end (anode), B to the GPIO through a 1kО© resistor, C to the GND of the Raspberry Pi. Notice the 3 pins for the transistor from left to right are E, B, C.

few jumper wires (mainly male to male, male to female).

a breadboard for prototyping (not necessary, but recommended).a 1kО© resistor to protect the transistor from overheat.a transistor to work as a electronic switch, I used NPN transistor.a 5V Fan, ideally with a case that has the slots for the fan.You might need the following things other than a Raspberry Pi: In this tutorial, we are going to build a auto start/stop 5V Fan for the Raspberry Pi 4 based on the temperature of CPU. The simplest solution would be adding a fan to cool it down, but it makes no sense to let the fan running all the time. However, the temperature could go pretty high when it is implementing intensive tasks.

RASPBERRY PI FAN CONTROL PORTABLE

This truly makes the Raspberry Pi a workable personal portable computer. The latest Raspberry Pi 4 comes with an option of 4G ram.

Raspberry pi fan control