Introduction: Controlling Your High-voltage Fan With an Touchscreen and Arduino MEGA!

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In this article we will control your high-voltaged Fan with an 2.8 inch TFT Touchscreen (Elecrow & Seeed) and Arduino Mega!
We implement a few relays and tranistors to switch high voltages with low currents. I have a particular type of fan with 3 phases with everyone his own speed. Read the tutorial below or watch the youtube video.

Step 1: Project Materials You Need

1x Arduino MEGA
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1x 2.8 inch TFT touchscreen
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3x 12V Relays
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3x Relay socket
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3x Protection diode
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3x BC237B Transistor
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3x 27K ohm resistor

Some wires
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Any type a Fan with 3 different speed levels.

Step 2: Wiring Diagram

Click here for the wiring diagram


Assamble the Touchscreen on your Arduino mega

Connections:

Arduino 12V - 12V breadboard
Arduino GND - 0V breadboard
Arduino pin 40 - resistor 2 27K ohm
Arduino pin 41 - resistor 3 27K ohm
Arduino pin 42 - resistor 1 27k ohm
Resistor 1 - BC237B (Basis) "NORMAL"
Resistor 2 - BC237B (Basis) "SLOW"
Resistor 3 - BC237B (Basis) "FAST"
BC237B (Emitter)"NORMAL" - 0V breadboard
BC237B (Emitter) "SLOW" - 0V breadboard
BC237B (Emitter)"FAST" - 0V breadboard
Relay 1 A1 - 12V breadboard
Relay 1 A2 - BC237B (Collector) "SLOW"
Relay 2 A1 - 12V breadboard
Relay 2 A2 - BC237B (Collector) "NORMAL"
Relay 3 A1 - 12V breadboard
Relay 3 A2 - BC237B (Collector) "FAST"
Relay 1 N.O Common(11) - 230V
Relay 2 N.O Common(11) - 230V
Relay 3 N.O Common(11) - 230V
Relay 1 N.O (14) - "SLOW SPEED" 230V FAN
Relay 2 N.O (14) - "NORMAL SPEED"230V FAN
Relay 3 N.O (14) - "FAST SPEED" 230V FAN
External 12V Supply - 12V breadboard
External 0V Supply - 0V breadboard
External 230V Supply - 230V
External 0V (High voltage) - 0V FAN
External PE - PE FAN

Step 3: Arduino Code

Download the SeeedTouchScreen and TFTv2 library and import them in your arduino software.

Click here for the SeeedTouch library link

Click here for the TFTv2 libarary

Download the Arduino Sketch & upload it to your Arduino.

Attachments

Step 4: Result

We got now 4 different buttons on the touchscreen.

"SLOW"
"NORMAL"
"FAST"
"OFF"

When a button is activated it will turn green and the related relay will be turned on.
It's protected against selecting mutiple speed levels!

Watch the video for the endresult :)

For more information & projects visit www.CreaTechWeb.com

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