TinyFan - RAMPS Fan Expansion Board
TinyFan is a handy little board that attaches to RAMPS, and allows you to control an extra two fans. TinyFan is ideal for dual-extruder systems, when you've used up all RAMPS’s MOSFETs on your HotEnds but still need to get a few fans up and running.
We designed TinyFan to be as easy to use as possible – an onboard screw-terminal makes it easy to provide power, simply run a short set of wires to the main screw terminals on RAMPS.
TinyFan has two fan outputs – each with an indicator LED and flyback diode for protection when using larger fans. TinyFan can also be used to control LEDs, or even heating elements – we've used TinyFan to power a HotEnd cartridge! Check the specifications for recommended power ratings.
TinyFan plugs directly into the ‘Servos’ header on RAMPS, and any attached fans are controlled by pins D11 and D6. Most printer firmware supports using these pins to control fans – we've got details on modifying Marlin here.
Running a 24V printer? TinyFan can handle it, just make sure your fans can! TinyFan will run on an input from 5V-25V, and because it’s fully PWM-controllable, you can always run your attached fans at any voltage lower than the input – so you can use 12V fans with a 24V supply! Just make sure you limit the PWM value to 50% in firmware, and your fans will run happily!
- 2 PWM Controllable Channels (D6 and D11 on RAMPS)
- Vin: 5-25V
- Max. Current: 3.5A / channel
- Flyback diode on each channel
- Indicator LED for each channel
- Dimensions: 15.5x15.5mm
For more details, including source files and a guide to getting TinyFan up and running, check the Aus3D Wiki.