LinkBack URL
About LinkBacks
سلام
من میخوام دمای یک هیتر 220 ولت رو به صورت pid و با سنسور ds18b20 کنترل کنم.
توی این سایت ( https://electronoobs.com/eng_arduino_tut39.php ) ی پروژه بود ک اومده قسمت 220 رو با ی ترایاک و ی اپتو کوپلر 3020 کنترل میکنه و نقطه 0 برق 220 رو هم با ی پل دیود و ی اپتو 817 به میکرو میده.فقط قسمت خوندن دما اومده از ترموکوپل استفاده کرده ک من تو برنامه به جای ترموکوپل اومدم سنسور رو قرار دادم.مدار برابر شماتیک https://electronoobs.com/images/Ardu...tic_AC_PID.png بسته شده فقط ترموکوپل حذف و سنسور ds 18b20 قرار داده شده.بعد تصحیح کد پروژه من مدار رو بستم برای تست به ترموکوپل 3021 ولتاژ دادم و هیتر گرم شد و مطمعن شدم قسمت 220 و ترایات کاملا درسته، خروجی اپتو 817 رو هم چک کردم داره درست کار میکنه ولی پایه 3 ک حاصل برآیند همه محاسبات و اعمال فرمان به اپتو هست بدون توجه به دمای هیتر و دمای ست پوینت یک سره 100میکروثانیه روشنو خاموش میشه و هیتر اصلا گرم نمیشه.من کدها رو قرار میدم اگه ممکنه راهنمایی بفرمایید
کد اصلی:
کد:/* Max6675 Module ==> Arduino * CS ==> D10 * SO ==> D9 * SCK ==> D13 * Vcc ==> Vcc (5v) * Gnd ==> Gnd */ //LCD config #include "max6675.h" #include <Wire.h> #include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x27,20,4); //sometimes the adress is not 0x27. Change to 0x3f if it dosn't work. /* i2c LCD Module ==> Arduino * SCL ==> A5 * SDA ==> A4 * Vcc ==> Vcc (5v) * Gnd ==> Gnd */ //Inputs and outputs int firing_pin = 3; int increase_pin = 11; int decrease_pin = 12; int zero_cross = 8; int thermoDO = 9; int thermoCS = 10; int thermoCLK = 13; //Start a MAX6675 communication with the selected pins MAX6675 thermocouple(thermoCLK, thermoCS, thermoDO); //Variables int last_CH1_state = 0; bool zero_cross_detected = false; int firing_delay = 7400; ////////////////////////////////////////////////////// int maximum_firing_delay = 7400; /*Later in the code you will se that the maximum delay after the zero detection * is 7400. Why? Well, we know that the 220V AC voltage has a frequency of around 50-60HZ so * the period is between 20ms and 16ms, depending on the country. We control the firing * delay each half period so each 10ms or 8 ms. To amke sure we wont pass thsoe 10ms, I've made tests * and the 7400us or 7.4ms was a good value. Measure your frequency and chande that value later */ ////////////////////////////////////////////////////// unsigned long previousMillis = 0; unsigned long currentMillis = 0; int temp_read_Delay = 500; int real_temperature = 0; int setpoint = 100; bool pressed_1 = false; bool pressed_2 = false; //PID variables float PID_error = 0; float previous_error = 0; float elapsedTime, Time, timePrev; int PID_value = 0; //PID constants int kp = 203; int ki= 7.2; int kd = 1.04; int PID_p = 0; int PID_i = 0; int PID_d = 0; void setup() { //Define the pins pinMode (firing_pin,OUTPUT); pinMode (zero_cross,INPUT); pinMode (increase_pin,INPUT); pinMode (decrease_pin,INPUT); PCICR |= (1 << PCIE0); //enable PCMSK0 scan PCMSK0 |= (1 << PCINT0); //Set pin D8 (zero cross input) trigger an interrupt on state change. PCMSK0 |= (1 << PCINT3); //Set pin D11 (increase button) trigger an interrupt on state change. PCMSK0 |= (1 << PCINT4); //Set pin D12 (decrease button) trigger an interrupt on state change. lcd.init(); //Start the LC communication lcd.backlight(); //Turn on backlight for LCD } void loop() { currentMillis = millis(); //Save the value of time before the loop /* We create this if so we will read the temperature and change values each "temp_read_Delay" * value. Change that value above iv you want. The MAX6675 read is slow. Tha will affect the * PID control. I've tried reading the temp each 100ms but it didn't work. With 500ms worked ok.*/ if(currentMillis - previousMillis >= temp_read_Delay){ previousMillis += temp_read_Delay; //Increase the previous time for next loop real_temperature = thermocouple.readCelsius(); //get the real temperature in Celsius degrees PID_error = setpoint - real_temperature; //Calculate the pid ERROR if(PID_error > 30) //integral constant will only affect errors below 30ºC {PID_i = 0;} PID_p = kp * PID_error; //Calculate the P value PID_i = PID_i + (ki * PID_error); //Calculate the I value timePrev = Time; // the previous time is stored before the actual time read Time = millis(); // actual time read elapsedTime = (Time - timePrev) / 1000; PID_d = kd*((PID_error - previous_error)/elapsedTime); //Calculate the D value PID_value = PID_p + PID_i + PID_d; //Calculate total PID value //We define firing delay range between 0 and 7400. Read above why 7400!!!!!!! if(PID_value < 0) { PID_value = 0; } if(PID_value > 7400) { PID_value = 7400; } //Printe the values on the LCD lcd.clear(); lcd.setCursor(0,0); lcd.print("Set: "); lcd.setCursor(5,0); lcd.print(setpoint); lcd.setCursor(0,1); lcd.print("Real temp: "); lcd.setCursor(11,1); lcd.print(real_temperature); previous_error = PID_error; //Remember to store the previous error. } //If the zero cross interruption was detected we create the 100us firing pulse if (zero_cross_detected) { delayMicroseconds(maximum_firing_delay - PID_value); //This delay controls the power digitalWrite(firing_pin,HIGH); delayMicroseconds(100); digitalWrite(firing_pin,LOW); zero_cross_detected = false; } } //End of void loop // | // | // | // v //See the interruption vector //This is the interruption routine (pind D8(zero cross), D11(increase) and D12(decrease)) //---------------------------------------------- ISR(PCINT0_vect){ ///////////////////////////////////////Input from optocoupler if(PINB & B00000001){ //We make an AND with the state register, We verify if pin D8 is HIGH??? if(last_CH1_state == 0){ //If the last state was 0, then we have a state change... zero_cross_detected = true; //We have detected a state change! We need both falling and rising edges } } else if(last_CH1_state == 1){ //If pin 8 is LOW and the last state was HIGH then we have a state change zero_cross_detected = true; //We haev detected a state change! We need both falling and rising edges. last_CH1_state = 0; //Store the current state into the last state for the next loop } if(PINB & B00100000){ //We make an AND with the state register, We verify if pin D11 is HIGH??? if (!pressed_1) { setpoint = setpoint + 5; //Increase the temperature by 5. Change this with your value if you want. delay(20); pressed_1 = true; } } else if (pressed_1) { pressed_1 = false; } if(PINB & B00010000){ //We make an AND with the state register, We verify if pin D12 is HIGH??? if (!pressed_2) { setpoint = setpoint - 5; //Decrease the temperature by 5. Change this with your value if you want. delay(20); pressed_2 = true; } } else if (pressed_2) { pressed_2 = false; } } //End of interruption vector for pins on port B: D8-D13
پاسخ با نقل قول