ardupilot/ArduPlane/sensors.pde

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// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
// Sensors are not available in HIL_MODE_ATTITUDE
#if HIL_MODE != HIL_MODE_ATTITUDE
void ReadSCP1000(void) {}
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void init_barometer(void)
{
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int flashcount;
long ground_pressure = 0;
int ground_temperature;
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#if HIL_MODE == HIL_MODE_SENSORS
hil.update(); // look for inbound hil packets for initialization
#endif
while(ground_pressure == 0){
barometer.Read(); // Get initial data from absolute pressure sensor
ground_pressure = barometer.Press;
ground_temperature = barometer.Temp;
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delay(20);
//Serial.printf("barometer.Press %ld\n", barometer.Press);
}
for(int i = 0; i < 30; i++){ // We take some readings...
#if HIL_MODE == HIL_MODE_SENSORS
hil.update(); // look for inbound hil packets
#endif
barometer.Read(); // Get initial data from absolute pressure sensor
ground_pressure = (ground_pressure * 9l + barometer.Press) / 10l;
ground_temperature = (ground_temperature * 9 + barometer.Temp) / 10;
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delay(20);
if(flashcount == 5) {
digitalWrite(C_LED_PIN, LOW);
digitalWrite(A_LED_PIN, HIGH);
digitalWrite(B_LED_PIN, LOW);
}
if(flashcount >= 10) {
flashcount = 0;
digitalWrite(C_LED_PIN, HIGH);
digitalWrite(A_LED_PIN, LOW);
digitalWrite(B_LED_PIN, HIGH);
}
flashcount++;
}
g.ground_pressure.set_and_save(ground_pressure);
g.ground_temperature.set_and_save(ground_temperature / 10.0f);
abs_pressure = ground_pressure;
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Serial.printf_P(PSTR("abs_pressure %ld\n"), abs_pressure);
SendDebugln_P("barometer calibration complete.");
}
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long read_barometer(void)
{
float x, scaling, temp;
barometer.Read(); // Get new data from absolute pressure sensor
//abs_pressure = (abs_pressure + barometer.Press) >> 1; // Small filtering
abs_pressure = ((float)abs_pressure * .7) + ((float)barometer.Press * .3); // large filtering
scaling = (float)g.ground_pressure / (float)abs_pressure;
temp = ((float)g.ground_temperature) + 273.15f;
x = log(scaling) * temp * 29271.267f;
return (x / 10);
}
// in M/S * 100
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void read_airspeed(void)
{
#if GPS_PROTOCOL != GPS_PROTOCOL_IMU // Xplane will supply the airspeed
airspeed_raw = ((float)adc.Ch(AIRSPEED_CH) * .25) + (airspeed_raw * .75);
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airspeed_pressure = max(((int)airspeed_raw - airspeed_offset), 0);
airspeed = sqrt((float)airspeed_pressure * g.airspeed_ratio) * 100;
#endif
calc_airspeed_errors();
}
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void zero_airspeed(void)
{
airspeed_raw = (float)adc.Ch(AIRSPEED_CH);
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for(int c = 0; c < 50; c++){
delay(20);
airspeed_raw = (airspeed_raw * .90) + ((float)adc.Ch(AIRSPEED_CH) * .10);
}
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airspeed_offset = airspeed_raw;
}
#endif // HIL_MODE != HIL_MODE_ATTITUDE
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void read_battery(void)
{
battery_voltage1 = BATTERY_VOLTAGE(analogRead(BATTERY_PIN1)) * .1 + battery_voltage1 * .9;
battery_voltage2 = BATTERY_VOLTAGE(analogRead(BATTERY_PIN2)) * .1 + battery_voltage2 * .9;
battery_voltage3 = BATTERY_VOLTAGE(analogRead(BATTERY_PIN3)) * .1 + battery_voltage3 * .9;
battery_voltage4 = BATTERY_VOLTAGE(analogRead(BATTERY_PIN4)) * .1 + battery_voltage4 * .9;
if(g.battery_monitoring == 1)
battery_voltage = battery_voltage3; // set total battery voltage, for telemetry stream
if(g.battery_monitoring == 2)
battery_voltage = battery_voltage4;
if(g.battery_monitoring == 3 || g.battery_monitoring == 4)
battery_voltage = battery_voltage1;
if(g.battery_monitoring == 4) {
current_amps = CURRENT_AMPS(analogRead(CURRENT_PIN_1)) * .1 + current_amps * .9; //reads power sensor current pin
current_total += current_amps * (float)delta_ms_medium_loop * 0.000278;
}
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#if BATTERY_EVENT == 1
if(battery_voltage < LOW_VOLTAGE) low_battery_event();
if(g.battery_monitoring == 4 && current_total > g.pack_capacity) low_battery_event();
#endif
}