Added IR distance code

build.sh

@@ -1,4 +1,15 @@
-avr-gcc -Os -DF_CPU=16000000L -DBAUD=9600UL -mmcu=atmega328p main.c -o main.o
-avr-objcopy -O ihex main.o main.hex
-avrdude -v -patmega328p -carduino -P/dev/ttyUSB0 -b57600 -D -Uflash:w:main.hex:i
- rm main.o main.hex
+
+if [ $# -eq 0 ]
+    then
+        file=main.c
+    else
+        file=$1
+fi
+
+ofile=$(echo $file | sed "s/\.c/\.o/")
+hexfile=$(echo $file | sed "s/\.c/\.hex/")
+
+avr-gcc -Os -DF_CPU=16000000L -DBAUD=9600UL -mmcu=atmega328p $file -o $ofile 
+avr-objcopy -O ihex $ofile $hexfile
+avrdude -v -patmega328p -carduino -P/dev/ttyUSB0 -b57600 -D -Uflash:w:$hexfile:i
+rm $ofile $hexfile

main.c

@@ -3,8 +3,8 @@
 #include <stdio.h>
 #include <stdarg.h>
 #include <util/setbaud.h>
-#define LED PORTB5
-#define WIRE PORTB0
+#define LED PORTD2
+#define WIRE PORTD3
 
 
 void uart_init() {
@@ -39,23 +39,23 @@ int main(void) {
     
     uart_init();
 
-    DDRB |= (1 << LED);
-    DDRB |= (1 << WIRE);
+	DDRC &= ~(1<<0); // Input
+	PORTC |= (1<<0); // Enable Internal Pull Up (Setting it to HIGH)
+
+    DDRD |= (1 << WIRE);
+
     for(;;){
             
-
         uart_putstr("hello\n");
-        
-        _delay_ms(100);
-        
-        PORTB |= (1 << LED);
-        PORTB |= (1 << WIRE);
-        
-        _delay_ms(100);
-        
-        PORTB &= (0 << LED);
-        PORTB &= (0 << WIRE);
+        _delay_ms(900);
+        PORTD |= (1 << WIRE);
+        _delay_ms(900);
+        PORTD &= (0 << WIRE);
     
+        uint8_t port_value = 0;
+        port_value = PINC & (1 << 0);
+        uart_putchar((char)port_value);
+        uart_putstr("\n");
     }
 
 }

main2.c

@@ -0,0 +1,118 @@
+#include <avr/io.h>
+#include <stdint.h>
+#include <util/delay.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <util/setbaud.h>
+
+#define LED             PORTB5
+#define RELAY           PORTB0 
+
+uint16_t adc_read(uint8_t adcx);
+void uart_init();
+void uart_putchar(char c);
+void uart_putstr(char *data);
+
+int main(void) {
+
+    uart_init();
+	
+    /* Enable the ADC */
+	ADCSRA |= _BV(ADEN);
+
+	/* Set the LED pin as an output. */
+    DDRB |= _BV(LED);
+    DDRB |= _BV(RELAY);
+
+    const int ring_buf_size = 20;
+    uint16_t ring_buf[ring_buf_size];
+    int index = 0;
+
+    float average = 10;
+    const int threshold = 50;
+
+    for (;;_delay_ms(200)) {
+
+        uint16_t pin_value = adc_read(0);
+
+        if (index > ring_buf_size)
+            index = 0;
+        ring_buf[index] = pin_value;
+        index++;
+
+        average = 0;
+        for (int i = 0; i < ring_buf_size; i++){
+            average += ring_buf[i];
+        }
+        average /= ring_buf_size;
+
+        // Print the value to serial
+        char buff[10];
+        itoa(pin_value, buff, 10);
+        uart_putstr(buff);
+        uart_putstr("\n");
+
+        itoa(average, buff, 10);
+        uart_putstr(buff);
+        uart_putstr("\n");
+
+//        PORTD |= (1 << WIRE);
+//        PORTD &= (0 << WIRE);
+
+        if (abs(pin_value - average) > threshold)
+			PORTB |= _BV(LED);
+		else
+			PORTB &= ~_BV(LED);
+        
+    }
+}
+
+uint16_t adc_read(uint8_t adcx) {
+	/* adcx is the analog pin we want to use.  ADMUX's first few bits are
+	 * the binary representations of the numbers of the pins so we can
+	 * just 'OR' the pin's number with ADMUX to select that pin.
+	 * We first zero the four bits by setting ADMUX equal to its higher
+	 * four bits. */
+    ADMUX = _BV(REFS0) | adcx;
+	/* This starts the conversion. */
+	ADCSRA |= _BV(ADSC);
+
+	/* This is an idle loop that just wait around until the conversion
+	 * is finished.  It constantly checks ADCSRA's ADSC bit, which we just
+	 * set above, to see if it is still set.  This bit is automatically
+	 * reset (zeroed) when the conversion is ready so if we do this in
+	 * a loop the loop will just go until the conversion is ready. */
+	while ( (ADCSRA & _BV(ADSC)) );
+
+	/* Finally, we return the converted value to the calling function. */
+	return ADC;
+}
+
+void uart_init() {
+    // Upper and lower bytes of the calculated prescaler value for baud.
+    UBRR0H = UBRRH_VALUE;
+    UBRR0L = UBRRL_VALUE;
+
+    // Configure data frame size to 8-bits.
+    UCSR0C = _BV(UCSZ01) | _BV(UCSZ00);
+
+    // Configure to enable transmitter.
+    UCSR0B = _BV(TXEN0);
+}
+
+void uart_putchar(char c) {
+    // Wait until the register to write to is free.
+    loop_until_bit_is_set(UCSR0A, UDRE0);
+
+    // Write the byte to the register.
+    UDR0 = c;
+}
+
+void uart_putstr(char *data) {
+    // Loop until end of string writing char by char.
+    while(*data){
+      uart_putchar(*data++);
+    }
+}