Hi Everyone,
There is a problem with max6675 feedback,i mean on the screen i cant see the temp. simultaneously i need to pust the button and renew it, otherwise i cant see the temp. i dont have any idea why.does anyone help me to fix my problem.
Here is the code''
''#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "max6675.h"
#define COOLDOWN_TIME 60 //60
#define PREHEAT_TIME 60
#define REFLOW_TIME 60
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
int thermoDO = 12;
int thermoCS = 13;
int thermoCLK = 14;
MAX6675 thermocouple(thermoCLK, thermoCS, thermoDO);
const int button = 2;
const int solidstate = 15;
const int poti = A0;
const int temp_preheat = 150;
const int temp_reflow = 241;
int temp_now = 0;
int temp_next = 0;
int temp_poti = 0;
int temp_poti_old = 0;
String state[] = {"OFF", "PREHEAT", "REFLOW", "COOLING"};
int state_now = 0;
int time_count = 0;
int perc = 0;
int offset = 0;
void setup() {
pinMode(button, INPUT);
pinMode(solidstate, OUTPUT);
digitalWrite(solidstate, LOW);
display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
display.clearDisplay();
display.display();
}
long t = millis();
long t_solder = millis();
void loop() {
temp_now = thermocouple.readCelsius();
temp_poti = map(analogRead(poti), 1023, 0, temp_preheat, temp_reflow);
if (temp_poti != temp_poti_old) {
int v = 0;
display.fillScreen(WHITE);
display.setTextColor(BLACK);
display.setTextSize(1);
display.setCursor(X(1, 7), Y(1, 0.1));
display.println("PREHEAT");
display.setTextSize(2);
display.setCursor(X(2, 3), Y(2, 0.5));
while (v < 100) {
temp_poti = map(analogRead(poti), 1023, 0, temp_preheat, temp_reflow);
if (temp_poti > temp_poti_old + 1 || temp_poti < temp_poti_old - 1) {
display.fillScreen(WHITE);
display.setTextSize(2);
display.setCursor(X(1, 19), Y(1, 0.1));
display.println("ERIME SIC.");
display.setTextSize(3);
display.setCursor(X(2, 5), Y(2, 0.5));
display.println(String(temp_poti)+(char)247);
display.display();
temp_poti_old = temp_poti;
v = 0;
}
v++;
delay(20);
}
temp_poti_old = temp_poti;
}
if (millis() > t + 200 || millis() < t) {
PrintScreen(state[state_now], temp_next, temp_now, time_count, perc);
t = millis();
}
if (digitalRead(button) == 0) {
delay(100);
int c = 0;
while (digitalRead(button) == 0) {
c++;
if (c > 150) {
digitalWrite(solidstate, LOW);
state_now = 0;
display.fillScreen(WHITE);
display.setTextColor(BLACK);
display.setTextSize(2);
display.setCursor(X(2, 3), Y(2, 0.5));
display.println("OFF");
display.display();
while (digitalRead(button) == 0) delay(1);
return;
}
delay(10);
}
t_solder = millis();
perc = 0,
state_now++;
if (state_now == 0) temp_next = 0;
else if (state_now == 1) temp_next = temp_preheat;
else if (state_now == 2) temp_next = temp_poti;
else if (state_now == 3) temp_next = 0;
else if (state_now == 4) {
state_now = 0;
temp_next = 0;
}
}
if (state_now == 1) { //PREHEAT
regulate_temp(temp_now, temp_next);
perc = int((float(temp_now) / float(temp_next)) * 100.00);
}
else if (state_now == 2) { //REFLOW
regulate_temp(temp_now, temp_next);
perc = int((float(temp_now) / float(temp_next)) * 100.00);
if (perc >= 100) {
state_now = 3;
t_solder = millis();
perc = 0;
temp_next = 0;
}
}
else if (state_now == 3) { //COOLING
digitalWrite(solidstate, LOW);
time_count = int((t_solder + COOLDOWN_TIME * 1000 - millis()) / 1000);
if (time_count <= 0) {
state_now = 0;
}
}
else {
digitalWrite(solidstate, LOW);
time_count = 0;
}
delay(30);
}
void regulate_temp(int temp, int should) {
if (should <= temp - offset) {
digitalWrite(solidstate, LOW);
}
else if (should > temp + offset) {
digitalWrite(solidstate, HIGH);
}
}
void PrintScreen(String state, int soll_temp, int ist_temp, int tim, int percentage) {
display.clearDisplay();
display.setTextColor(WHITE);
display.setTextSize(1);
display.setCursor(0, 0);
display.println(state);
display.setCursor(95, 0);
String str = String(soll_temp)+(char)247+"C";
display.println(str);
if (tim != 0) {
display.setCursor(0, 50);
str = String(tim) + " sec";
display.println(str);
}
if (percentage != 0) {
display.setCursor(80, 50);
str = String(percentage) + " %";
display.println(str);
}
display.setTextSize(2.5);
display.setCursor(35, 22);
str = String(ist_temp) + (char)247 + "C";
display.println(str);
display.display();
}
int X(int textgroesse, int n) {
//gibt die X koordinate aus, damit text mit n zeichen mittig ist
return (0.5 * (display.width() - textgroesse * (6 * n - 1)));
}//end int X
int Y(int textgroesse, float f) {
//gibt die Y koordinate aus, damit text mittig ist
return (f * display.height() - (textgroesse * 4));
}//end int Y
''