Fordi/button.ino

## button.ino

// the number of the pushbutton pin
const int buttonPin = PB0;
// the number of the LED pin
const int ledPin =  PB1;

int ledState = 0;
int buttonState = 0;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT);
}

void loop() {
  // Read the button
  int btn = digitalRead(buttonPin);
  // when button state has changed and is pressed
  if (btn != buttonState && btn == HIGH) {
    // toggle the logical LED state
    if (ledState == HIGH) {
      ledState = LOW;
    } else {
      ledState = HIGH;
    }
    // and make the logical real
    digitalWrite(ledPin, ledState);
  }
  buttonState = btn;
}

## instructions.md

      
    Raw
  

              instructions.md
            
          
    Parts list

Tools:

One-time


Tiny AVR programmer: https://www.sparkfun.com/products/11801
Soldering iron
(optional, but recommended) Wire strippers

Consumable


Solder
Hook-up wire

Parts


ATTiny85: https://www.sparkfun.com/products/9378
LED Tactile button, red: https://www.sparkfun.com/products/10442
12mm Coin Cell Breakout Board: https://www.adafruit.com/product/1868
12mm coin cell: https://www.sparkfun.com/products/337
100Ω resistors: https://www.sparkfun.com/products/13761
10kΩ resistors: https://www.sparkfun.com/products/14491

Set-up


Install Arduino IDE - https://www.arduino.cc/en/Main/Software
Install USBTinyISP drivers - https://cdn.sparkfun.com/datasheets/Dev/AVR/usbtinyisp_libusb_1.2.6.0.zip
Install ATTiny board definitions - http://highlowtech.org/?p=1695

Programming


Open button.ino in Arduino IDE
Insert ATTiny85 into Tiny AVR programmer
Click "Upload" button, or Sketch/Upload

Assembly

Note: I'm a flake.  When in doubt, follow the schematic.

Find a good place for the parts in your wand/sword/whatever
Wire a positive battery terminal ATTiny's VCC
Wire a negative terminal to ATTiny's GND
Solder-tie a short lead on the button to the long lead on the button not marked with '+', then wire the bundle to GND
Wire the other short lead on the same side of the button to ATTiny pin 5 (PB0, bottom-right), and to a 10kΩ resistor
Wire the other side of the resistor to the positive battery terminal
Wire the long lead marked '+' to one side of the 100Ω resistor
Wire the resistor to ATTiny pin 6 (PB1, just above pin 5)

More information


ATTiny85 Datasheet: https://www.mouser.com/ds/2/268/Atmel-2586-AVR-8-bit-Microcontroller-ATtiny25-ATti-1066528.pdf
LED Pushbutton

datasheet: https://www.sparkfun.com/datasheets/Components/General/TSL12121.pdf
drawing: https://www.sparkfun.com/datasheets/Components/General/TSD1265.png


## schematic.png

      
    Raw
  

              schematic.png

	// the number of the pushbutton pin
	const int buttonPin = PB0;
	// the number of the LED pin
	const int ledPin = PB1;

	int ledState = 0;
	int buttonState = 0;

	void setup() {
	pinMode(ledPin, OUTPUT);
	pinMode(buttonPin, INPUT);
	}

	void loop() {
	// Read the button
	int btn = digitalRead(buttonPin);
	// when button state has changed and is pressed
	if (btn != buttonState && btn == HIGH) {
	// toggle the logical LED state
	if (ledState == HIGH) {
	ledState = LOW;
	} else {
	ledState = HIGH;
	}
	// and make the logical real
	digitalWrite(ledPin, ledState);
	}
	buttonState = btn;
	}