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PRO
USA
#1  

There are at least 3 types of Power fans: A) 2 wires (+, -) B) 3 wires (+, -, TACH) C) 4 wires (+, -, TACH, PWM)

A, B types:

For A, B types you can connect a H-bridge https://www.ez-robot.com/Shop/AccessoriesDetails.aspx?prevCat=9&productNumber=14 and you can control the fan with https://synthiam.com/Support/Skills/Movement-Panels/Dual-HBridge-w-PWM?id=16067 control.

it works similar to a continuous servo but is not a continuous servo.

C type: The fan has a embedded micro-controller, and the proper way to drive the fan is to use the PWM pin. Note: Some fan's PWM pin requires a high frequency i.e. 25Khz.  You can try connect the PWM pin to an EZB's digital pin and use the pwm slider: https://synthiam.com/Support/Skills/Pwm/PWM-Slider?id=16047 IF does not work due the frequency (EZB PWM is not 25Khz) you will need an arduino micro-controller  and code some custom firmware to generate the 25Khz frequency.

it works similar to a continuous servo but is not a continuous servo.

PRO
Synthiam
#2  

And one further suggestion is to remove the electronic pcb from a continuous rotation servo and connect it to a regular fan.

that way you use the servo pcb to control the fan speed. And in ARC you’ll just a regular continuous rotation servo control with speed for both directions :)

#3  

Both @PTP and @DJ Sures answers assume you want speed control on the fan.  For a simple on off, you just need a transistor (and potentially a voltage regulator or alternate power source depending on whether the fan can run on the same voltage you are providing to your controller).

Alan

PRO
Synthiam
#4  

Ha ha ya and Alan is right on that observation :). The easiest solution is the most elegant

United Kingdom
#5  

Thanks very much for details of the numerous options. This level of support is amazing!!!!!

PRO
Synthiam
#6  

Let us know how it works out for you