Attention!

This instructable belongs to a huge project. This is just one part of it. In case you found this page first, please visit the main project https://www.instructables.com/id/GalileoHome/

We named our project Smartilator, a name composed of smart and ventilator. We constructed three different models, with different design and also different circuitry. Two of them are lighted with LEDs. We can manage the ventilators through an app named Frontend. Depending on the temperature of the room they can switch automatic according to the preset value on the app.

Step 1: Hardware

Common for all models:

Intel Galileo board
1 power supply for the motors
Resistances

Basic model:

Mosfet type: BS170
Motor type: Sharkoon system fan

Model 3000:

MOSFET type: IRFD110
Motor type: Sharkoon system fan
4 LEDs type: White LED

Model Retro:

MOSFET type: IRLZ34N
Motor type: Twister Storm 12cm (UCTS12A)
8 LEDs type: White LED

Step 2: Software

OpenSCAD
Arduino

Step 3: Mode of Operation

The so-called PWM (pulse width modulation) regulates the voltage that the pin puts onto the gate of the MOSFET Thereby the MOSFET regulates the flowing current of the circuit. The motors receive electricity only when the MOSFET permits. Both MOSFET and motor don’t behave lineal but in this range it's a close enough approximation so that further computation isn't needed.

The power magnitude is updated once there’s a new value in the channel “Smartilator”. The power magnitude tolerates values from 0 to 100%. Taking into account that the motors start up with different levels, every ventilator has a different lower limit.