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Add calibration code

touch-sensor
Savanni D'Gerinel 2023-07-12 22:32:53 -04:00
parent ed3c2a3c86
commit 0971859f46
1 changed files with 39 additions and 8 deletions
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47
touch-sensor/main.c
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@ -14,6 +14,18 @@ uint32_t read_capacitance(dio_t *dio) {
return i;
}
uint32_t calibrate(dio_t *dio) {
uint32_t max = 0;
for (uint8_t i = 0; i < 100; i++) {
uint8_t cap = read_capacitance(dio);
max = cap > max ? cap : max;
_delay_ms(10);
}
return max;
}
int main(void) {
dio_t sensor = (dio_t){ .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 0 };
display_t display = {
@ -28,10 +40,6 @@ int main(void) {
display_enable(&display);
display_clear(&display);
display_set_location(&display, 0, 0);
display_write_message(&display, "Ready");
// calibration
//
// 100 times:
@ -51,12 +59,35 @@ int main(void) {
MCUCR |= _BV(PUD);
uint8_t calibration_countdown = 0;
uint32_t calibration = 0;
bool touch = false;
while (1) {
if (calibration_countdown == 0 && !touch) {
calibration = calibrate(&sensor);
calibration_countdown = 100;
char msg[20];
snprintf(msg, 20, "calib: %6ld", calibration);
display_set_location(&display, 0, 0);
display_write_message(&display, msg);
}
uint32_t cap = read_capacitance(&sensor);
char msg[20];
snprintf(msg, 20, "cap: %5ld", cap);
display_set_location(&display, 1, 0);
display_write_message(&display, msg);
if (cap > calibration) {
display_set_location(&display, 1, 0);
display_write_message(&display, "touch!");
touch = true;
} else if (touch) {
display_set_location(&display, 1, 0);
display_write_message(&display, " ");
touch = false;
}
if (calibration_countdown > 0) {
calibration_countdown--;
}
_delay_ms(100);
}