Browse over 10,000 Electronics Projects using the Page Numbering provided at the bottom of each Page.

Fan speed controller

Fan speed controller

This proto implementation has components installed for two sensors, controlling two groups of fans. The switch is just for safety backup: if something would break or not function as intended the switch provides full fan speed independent of other circuit operation.
After some bad experiences with commercial fan speed controllers in the PCs in my home, I decided it would be easy to build a better one myself. Indeed, after a few evenings, I obtained these results….

  • Three temperature sensors are supported, each controlling the speed of a (group of) fan(s).
  • A small potmeter for each sensor allows to choose the actual temperature above which the fan starts running. Higher temperatures cause a linear increase in fan speed.
  • When the measured temperature decreases, the actual fan speed is decreased only very slowly (taking several minutes), to avoid control instability.
  • An additional potmeter provides a minimum fan speed, independent of temperature.
  • The circuit is built with very few components, thanks to a low-cost PIC 16F676 microcontroller. This controller takes care of A/D conversion of the analog inputs, proper signal filtering, and the creation of PWM output signals to drive the fans. The PWM driving of the fans is a fast on/off switching with variable duty cycle, so the output transistors will remain cool even when driving many fans.
  • A bicolor LED gives a visual temperature indication by gradually changing color from green to red.

Visit Here for more.

 

More Articles to Read

Single-Sided USB Charger
Single-Sided USB Charger
A FPGA controlled RGB LED MATRIX for Incredible Effects – the Hardware
A FPGA controlled RGB LED MATRIX for Incredible Effects – the Hardware
Using Nanotimers to Reduce IoT System Power Consumption by an Order of Magnitude
Using Nanotimers to Reduce IoT System Power Consumption by an Order of Magnitude
Replace a microwave’s beeping with the Windows XP startup sound
Replace a microwave’s beeping with the Windows XP startup sound
A DIY Laser Scanning Microscope
A DIY Laser Scanning Microscope
Reverse-engineering the surprisingly advanced ALU of the 8008 microprocessor
Reverse-engineering the surprisingly advanced ALU of the 8008 microprocessor
ESP8266 LED lighting: QuinLED v2.6 PCB
ESP8266 LED lighting: QuinLED v2.6 PCB
Switching LVDS Graphics in a Laptop Computer
Switching LVDS Graphics in a Laptop Computer
Teleknitting: TV-based string art
Teleknitting: TV-based string art
DIY Bubble Machine
DIY Bubble Machine
Start your day with Nerf target practice!
Start your day with Nerf target practice!
Teardown of a Peaktech 6225A
Teardown of a Peaktech 6225A

Top




Shares