127 lines
2.8 KiB
Arduino
127 lines
2.8 KiB
Arduino
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//Make sure to install the library
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#include <QTRSensors.h>
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QTRSensors qtr;
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const uint8_t SensorCount = 8;
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uint16_t sensorValues[SensorCount];
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float Kp = 0.07; //set up the constants value
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float Ki = 0.001;
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float Kd = 0.6;
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int P;
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int I;
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int D;
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int lastError = 0;
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boolean onoff = false;
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//Increasing the maxspeed can damage the motors - at a value of 255 the 6V motors will receive 7,4 V
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const uint8_t maxspeeda = 150;
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const uint8_t maxspeedb = 150;
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const uint8_t basespeeda = 100;
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const uint8_t basespeedb = 100;
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//Set up the drive motor carrier pins
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int mode = 8;
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int aphase = 6;
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int aenbl = 9;
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int bphase = 5;
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int benbl = 3;
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//Set up the buttons pins
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int buttoncalibrate = 17; //pin A3
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int buttonstart = 2;
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void setup() {
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Serial.begin(9600);
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qtr.setTypeRC();
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//Set up the sensor array pins
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qtr.setSensorPins((const uint8_t[]) {
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10, 11, 12, 14, 15, 16, 18, 19
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}, SensorCount);
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qtr.setEmitterPin(7);//LEDON PIN
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pinMode(mode, OUTPUT);
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pinMode(aphase, OUTPUT);
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pinMode(aenbl, OUTPUT);
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pinMode(bphase, OUTPUT);
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pinMode(benbl, OUTPUT);
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digitalWrite(mode, HIGH);
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delay(500);
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pinMode(LED_BUILTIN, OUTPUT);
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boolean Ok = false;
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while (Ok == false) { //the loop won't start until the robot is calibrated
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if (digitalRead(buttoncalibrate) == HIGH) {
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calibration(); //calibrate the robot for 10 seconds
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Ok = true;
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}
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}
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forward_brake(0, 0);
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}
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void calibration() {
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digitalWrite(LED_BUILTIN, HIGH);
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for (uint16_t i = 0; i < 400; i++)
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{
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qtr.calibrate();
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}
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digitalWrite(LED_BUILTIN, LOW);
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}
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void loop() {
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if (digitalRead(buttonstart) == HIGH) {
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onoff = ! onoff;
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if (onoff = true) {
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delay(1000);//a delay when the robot starts
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}
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else {
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delay(50);
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}
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}
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if (onoff == true) {
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PID_control();
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Serial.print(">>>>>PID-control");
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}
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else {
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forward_brake(0, 0);
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Serial.print(">>>>>forward-brake");
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}
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}
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void forward_brake(int posa, int posb) {
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//set the appropriate values for aphase and bphase so that the robot goes straight
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digitalWrite(aphase, HIGH);
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digitalWrite(bphase, HIGH);
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analogWrite(aenbl, posa);
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analogWrite(benbl, posb);
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}
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void PID_control() {
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uint16_t position = qtr.readLineBlack(sensorValues);
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int error = 3500 - position;
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P = error;
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I = I + error;
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D = error - lastError;
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lastError = error;
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int motorspeed = P * Kp + I * Ki + D * Kd;
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int motorspeeda = basespeeda + motorspeed;
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int motorspeedb = basespeedb - motorspeed;
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if (motorspeeda > maxspeeda) {
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motorspeeda = maxspeeda;
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}
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if (motorspeedb > maxspeedb) {
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motorspeedb = maxspeedb;
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}
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if (motorspeeda < 0) {
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motorspeeda = 0;
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}
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if (motorspeedb < 0) {
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motorspeedb = 0;
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}
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Serial.print(motorspeeda);Serial.print(" ");Serial.println(motorspeedb);
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Serial.print(position);
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forward_brake(motorspeeda, motorspeedb);
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}
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