ardupilot/libraries/PID/examples/pid/pid.pde

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/*
Example of PID library.
2010 Code by Jason Short. DIYDrones.com
*/
#include <FastSerial.h>
#include <avr/pgmspace.h>
#include <AP_Common.h>
#include <APM_RC.h> // ArduPilot RC Library
#include <PID.h> // ArduPilot Mega RC Library
#include <Arduino_Mega_ISR_Registry.h>
long radio_in;
long radio_trim;
Arduino_Mega_ISR_Registry isr_registry;
#if CONFIG_APM_HARDWARE == APM_HARDWARE_APM2
APM_RC_APM2 APM_RC;
#else
APM_RC_APM1 APM_RC;
#endif
PID pid(AP_Var::k_key_none, NULL);
void setup()
{
Serial.begin(38400);
Serial.println("ArduPilot Mega PID library test");
APM_RC.Init(&isr_registry); // APM Radio initialization
delay(1000);
//rc.trim();
radio_trim = APM_RC.InputCh(0);
pid.kP(1);
pid.kI(0);
pid.kD(0.5);
pid.imax(50);
pid.save_gains();
pid.kP(0);
pid.kI(0);
pid.kD(0);
pid.imax(0);
pid.load_gains();
Serial.printf("P %f I %f D %f imax %f\n", pid.kP(), pid.kI(), pid.kD(), pid.imax());
}
void loop()
{
delay(20);
//rc.read_pwm();
long error = APM_RC.InputCh(0) - radio_trim;
long control = pid.get_pid(error, 20, 1);
Serial.print("control: ");
Serial.println(control,DEC);
}