• Raspberry pi 4 4B GPIO Expansion Board Heatsink Kit with PWM Controllable Cooling Fan DC 5V

    Raspberry pi 4 4B GPIO Expansion Board Heatsink Kit with PWM Controllable Cooling Fan DC 5V

    Price:   $7.99

    • 0 Units in Stock
    • Manufactured by: Treedix

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    (complete orders today,deliverd around 21/09/2021)

    1.This is a multifunctional heat dissipation expansion board specially developed for Raspberry Pi, which is light and easy to install. The fan has very low noise and it only runs when you need it.
    2.Using the principle of PWM pulse signal to realize signal output. When the temperature reaches 40°, the cooling fan will automatically rotate to protect the Raspberry Pi and extend its life.
    3.The pin identification is clear, and the GPIO function is fully displayed.
    On-board large-size cooling fan, good heat dissipation ,strong wind power make the Raspberry Pi run more stable and no worrying about overheating and noise problems. No wiring, you can also extend the Raspberry Pi 40pin connector,you can connector, you can connect other devices.
    4.Specially designed for Raspberry Pi, it is perfectly compatible with Raspberry Pi 4 and 4B, does not occupy any Raspberry Pi pins, and does not occupy the space of the heat sink.

    User Guide:
    1.Using the Script
    First of all we'll need to access our system via SSH or open a terminal to install the GPIO access library for the Raspberry Pi:
      cd /tmp
      wget https://project-downloads.drogon.net/wiringpi-latest.deb
      sudo dpkg -i wiringpi-latest.deb

    Wait for the download to to install wiringpi:
      sudo dpkg -i wiringpi-latest.deb

    Check Gpio:
      gpio -v

    2.Then we create a text document on the home directory and copy the content of fan.sh:
      cd ~
      nano fan.sh

    Paste the script and save it with CTRL+X. When we exit the editor, we'll give the script execution permissions with:
      sudo chmod +x fan.sh

    Now the script is ready to be used. But we'll need run it manually every time the computer is started. To solve this we'll use a Linux daemon called Cron:
      crontab -e

    Paste the next line at the end of the file where there is no #:

      @reboot /bin/bash /home/pi/fan.sh > /dev/null 2>&1

    Save it with CTRL+X and exit.
    Now the script is scheduled. To execute it we need to restart and it'll start running in the background.
      sudo reboot

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