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Playing with my Arduino (Board) - October 31st, 2011

Electromagnet Layout

Breadboard and Arduino Electromagnet Layout

The Code:

const int SWITCH = 9; //pin for the MOSFET
const int BUTTON = 7; //pin for the Button
const int LED = 13; //pin for the LED
int val = 0; //used to store state of input pin
int old_val = 0; //used to store previous value of val
int state = 0; //1 = LED off and 0 = LED on

void setup()
{
pinMode(SWITCH, OUTPUT); //Map output to MOSFET
pinMode(BUTTON, INPUT); //Map input to Button
pinMode(LED, OUTPUT); //Map output to LED
Serial.begin(300); //Initiate a data connection between the board and a computer
}

void loop()
{
val = digitalRead(BUTTON); //Read input value of Button and store it

//check for change in value
if ((val == HIGH) && (old_val == LOW)) {
state = 1 - state;
delay(10);
}

old_val = val; //store the old value
if (state == 1) {
Serial.println("OFF"); //send off message back to the computer
digitalWrite(SWITCH, LOW); //turn off flow of electricity to magnet
digitalWrite(LED, LOW); //turn off LED
} else {
Serial.println("ON"); //send on message back to the computer
digitalWrite(SWITCH, HIGH); //turn on flow of electricity to magnet
digitalWrite(LED, HIGH); //turn on LED
}
}

Wait!  Although Arduino may sound like Italian slang for a part of the human body I assure you I’ve been occupying myself in other ways.

You may have heard of the Maker Movement and the wonderful interactive projects prototyped using these versatile little boards.  Well, I finally jumped on board myself.  If you look at the schematics to the right you will see the layout of my very first original project.  About a month ago I was experimenting with home-made electromagnets and posted this video on Youtube.  This weekend I integrated the electromagnet with Arduino controller.  I’ve put together a video demonstration below showing it in action.

If I haven’t plugged it enough in the video, I really got a lot out of Massimo Banzi’s “Getting Started with Arduino” book. I believe it to be a must-read for any noob using these controller boards. The illustrations and examples are very simple to follow. I also referenced the Arduino web site: arduino.cc in the video.




1 Comment

  • Hi,
    Really Thanks for sharing with us your project :)
    I’m a student from Singapore.Now I’m doing a magnetic art work. And found your blog it’s really very helpful.
    Is it possible to give me more details about it? like what kind of register should be used ? Because I follow your board design.But it didn’t work :(
    Hope to receive your reply ! and thanks for taking time to read my ‘comment’.


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