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#define TX_PULSE 100 //(100uS) TX Pulse width of 100uS
#define PULSE_1_DELAY 10 //( 20uS) Delay before Main Sample Pulse 10-60uS
#define PULSE_1 45 //( 45uS) Sample 1 Pulse Duration 45uS
#define PULSE_2_DELAY 90 //( 90uS) Delay between Pulse 1 and Pulse 2 90uS (increase this!)
#define PULSE_2 45 //( 45uS) Sample 2 Pulse Duration 45uS
#define WAIT_PERIOD 1300 //(1.3ms) delay till next sequence
#define BCT 3600
#define BAT_LOW 1.50
#define CONTRAST_PIN 9 //15
int bcount = 0;
unsigned int duty_count = 0;
unsigned long loop_timer_start = 0;
unsigned long loop_timer_end = 0;
int adjust = 0;
int contrast = 65;
int xcol = 3;
int xrow = 2;
char key;
char menu_line_1a[] = " Menu [A]";
char menu_line_1b[] = " Contrast (D)";
char menu_line_1c[] = " Timing Menu (B)";
char menu_line_1d[] = " Exit Menu (*)";
int clean = 0;
int repaint = 0;
byte con[8] = {
0b00100,
0b01110,
0b11111,
0b00000,
0b00000,
0b11111,
0b01110,
0b00100
};
LiquidCrystal lcd(8,7,6,5,4,3);
void setup ()
{
pinMode (A0, OUTPUT);
pinMode (A1, OUTPUT);
pinMode (A2, OUTPUT);
pinMode (A5, INPUT);
digitalWrite (A0, LOW);
digitalWrite (A1, LOW);
digitalWrite (A2, LOW);
pinMode(CONTRAST_PIN, OUTPUT);
analogWrite (CONTRAST_PIN, contrast);
lcd.createChar(1, con);
lcd.begin(20, 4);
lcd.setCursor(0, 0);
delay(500);
lcdstart();
Serial.begin(9600);
}
void loop ()
{
if(bcount++ > BCT) check_battery();
pulses();
duty_count++;
if(duty_count == 1) loop_timer_start = micros();
// control pulses per second //
if(duty_count == 625)
{
duty_count = 0;
}
if(duty_count == 1) loop_timer_end = micros();
adjust = loop_timer_end - loop_timer_start;
delayMicroseconds (WAIT_PERIOD - adjust);
}
void pulses ()
{
cli () ;
PINC = 0x01;
delayMicroseconds(TX_PULSE);
PINC = 0x01;
delayMicroseconds(PULSE_1_DELAY);
PINC = 0x02;
delayMicroseconds(PULSE_1) ;
PINC = 0x02;
delayMicroseconds(PULSE_2_DELAY);
PINC = 0x04;
delayMicroseconds(PULSE_2);
PINC = 0x04;
sei () ;
}
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