Door Activated LED Lighting using Hall Effect Sensors

Step 5 Moving from Arduino to AVR

The next step is to take our circuit and code from an arduino and transfer them to a standalone AVR chip. The reason I'm using an Attiny85 is because its the smallest AVR I have and I only needed 2 pins.
The fuses are set to an 8Mhz internal RC timer since timing isn't critical. Once done with the code, go right ahead and solder the circuit together.

Below is the code I used for the AVR. If you aren't familiar with AVR programming, most of what you need can be found here:http://iamsuhasm.wordpress.com/tutsproj/avr-gcc-tutorial/ and the tutorials here: http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewforum&f=11&sid=f899212b86e2e0de2b660c0999f95fd7

#include <avr/io.h>
#include <util/delay.h>
#include <avr/sfr_defs.h>
#define lights PB0
#define magSense PB1

void initPorts();

int main(void)
{
volatile uint16_t val; // variable for reading the pin status
//volatile uint16_t lightMode = 0; // variable to keep the light's state
initPorts();
while(1){
val = bit_is_set(PINB, magSense); // read input value and store it in val
if (val) // make sure we got a 1
PORTB |= (1 << lights);
else
PORTB &= ~(1 << lights);
}
return 0;
}

void initPorts(){
PORTB = 0b000010; // enable pull up on sensor pin
DDRB = 0b000001; // set PB0 as output and rest as input
}