DIY Soldering Iron Control for 862D+

Did your somewhat expensive ($50) soldering iron just die? Well then fix it with another one!

Oct 17, 2018

•

10161 views

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8 respects

Components and supplies

irf540n n-channel mosfet

5v linear regulator

Resistor 330 ohm

.96 inch Oled

Normal Flyback Diode.

Arduino Nano R3

pin headers(male)

Tools and machines

Soldering iron (generic)

8mm drill bit /w drill

Project description

Code

The Code

c_cpp

Paste into editor and upload. Only works with designed schematic.

1#include <Wire.h>
2#include <Adafruit_SSD1306.h>
3#include <Adafruit_GFX.h>
4
5#define  OLED_ADDR   0x3C
6Adafruit_SSD1306 display(-1);
7
8int settemp = 590; //manual  set variables
9
10int output = 0;
11int temp = 0;
12String inputString = "";
13boolean  rap = false;
14boolean stringComplete = false;
15int t = 0;
16int mappedpower  = 0;
17byte powermultiply = 0;
18long counter = 0;
19int temp2 = 0;
20byte outputoffset  = 0;
21byte scaleread = 0;
22
23void setup() {
24  Serial.begin(9600);
25  pinMode(12,  OUTPUT);
26  digitalWrite(12, LOW);
27  display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
28  display.clearDisplay();
29  display.display();
30  rapid();
31}
32
33void  loop() {
34  pid();
35  display.clearDisplay();
36  updatebar();
37  updatetext();
38  display.display();
39}
40
41void rapid() { //Controls the soldering iron by  rapidly heating it up in the beginning.
42  if (rap == false) {
43    digitalWrite(12,  HIGH);
44    output = 255;
45    do {
46      temp = analogRead(0);
47      Serial.print("rapid");
48      Serial.println(temp);
49      display.clearDisplay();
50      updatebar();
51      updatetext();
52      display.display();
53    } while (temp - settemp >  1);
54    digitalWrite(12, LOW);
55    rap = true;
56  }
57}
58
59void pid()  { //Controls the soldering with slow active power heating.
60  temp = analogRead(0);  //Temp averager
61  temp2 = temp;
62  delay(50);
63  temp = analogRead(0);
64  temp = temp + temp2;
65  temp = temp / 2;
66
67  zeroscale; //activate no soldering  iron checker
68  temp = temp + outputoffset;
69
70  output = temp - settemp;
71  output = output + powermultiply;
72  output = output * 4;
73
74  if (output  < 0) {
75    output = 0;
76  }
77  if (output > 255) {
78    output = 255;
79  }
80  counter = counter + 1;
81  if (counter > 10) {
82    counter = 0;
83    if (temp > settemp + 3) {
84      powermultiply = powermultiply + 1;
85    }
86    if (temp < settemp - 3 && powermultiply > 0) {
87      powermultiply = powermultiply  - 1;
88    }
89  }
90  Serial.print(powermultiply);
91  Serial.print(", ");
92  Serial.print(temp);
93  Serial.print(", ");
94  Serial.println(output);
95  analogWrite(12, output);
96}
97
98void updatebar() { //Updates Powerbar on  OLED display
99  mappedpower = map(output, 0, 255, 0, 127) - 10;
100  display.fillRect(0,  0, mappedpower, 8, WHITE);
101  display.fillRoundRect(mappedpower - 5, 0, 20, 8,  3, WHITE);
102}
103
104void updatetext() {//Update text on Oled display
105  display.setCursor(0,  9);
106  display.setTextColor(WHITE);
107  display.setTextSize(1);
108  display.print("Set  Temp: ");
109  display.print(settemp);
110  display.setCursor(0, 20);
111  display.print("Temp:  ");
112  display.print(temp);
113}
114
115void zeroscale() { //If soldering iron  is unplugged, adjust the input pin value to zero it out
116  if (output < 200) {
117    display.clearDisplay();
118
119    display.setCursor(0, 9);
120    display.setTextColor(WHITE);
121    display.setTextSize(1);
122    display.print("No soldering iron, or defective");
123    display.setCursor(0, 15);
124    display.print("iron.");
125    display.setCursor(0,  20);
126    display.print("Testing in 5 seconds.");
127
128    display.display();
129    delay(5000);
130
131    if (output < 200) {
132      outputoffset = temp;
133    }
134    display.clearDisplay();
135
136    display.setCursor(0, 9);
137    display.setTextColor(WHITE);
138    display.setTextSize(1);
139    display.print("Output offset set.");
140    display.setCursor(0,  20);
141    display.print("Please plug in the iron.");
142
143    display.display();
144    do {
145      scaleread = analogRead(0);
146    } while (scaleread < 200);
147
148  }
149}
150

#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>

#define  OLED_ADDR   0x3C
Adafruit_SSD1306 display(-1);

int settemp = 590; //manual  set variables

int output = 0;
int temp = 0;
String inputString = "";
boolean  rap = false;
boolean stringComplete = false;
int t = 0;
int mappedpower  = 0;
byte powermultiply = 0;
long counter = 0;
int temp2 = 0;
byte outputoffset  = 0;
byte scaleread = 0;

void setup() {
  Serial.begin(9600);
  pinMode(12,  OUTPUT);
  digitalWrite(12, LOW);
  display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
  display.clearDisplay();
  display.display();
  rapid();
}

void  loop() {
  pid();
  display.clearDisplay();
  updatebar();
  updatetext();
  display.display();
}

void rapid() { //Controls the soldering iron by  rapidly heating it up in the beginning.
  if (rap == false) {
    digitalWrite(12,  HIGH);
    output = 255;
    do {
      temp = analogRead(0);
      Serial.print("rapid");
      Serial.println(temp);
      display.clearDisplay();
      updatebar();
      updatetext();
      display.display();
    } while (temp - settemp >  1);
    digitalWrite(12, LOW);
    rap = true;
  }
}

void pid()  { //Controls the soldering with slow active power heating.
  temp = analogRead(0);  //Temp averager
  temp2 = temp;
  delay(50);
  temp = analogRead(0);
  temp = temp + temp2;
  temp = temp / 2;

  zeroscale; //activate no soldering  iron checker
  temp = temp + outputoffset;

  output = temp - settemp;
  output = output + powermultiply;
  output = output * 4;

  if (output  < 0) {
    output = 0;
  }
  if (output > 255) {
    output = 255;
  }
  counter = counter + 1;
  if (counter > 10) {
    counter = 0;
    if (temp > settemp + 3) {
      powermultiply = powermultiply + 1;
    }
    if (temp < settemp - 3 && powermultiply > 0) {
      powermultiply = powermultiply  - 1;
    }
  }
  Serial.print(powermultiply);
  Serial.print(", ");
  Serial.print(temp);
  Serial.print(", ");
  Serial.println(output);
  analogWrite(12, output);
}

void updatebar() { //Updates Powerbar on  OLED display
  mappedpower = map(output, 0, 255, 0, 127) - 10;
  display.fillRect(0,  0, mappedpower, 8, WHITE);
  display.fillRoundRect(mappedpower - 5, 0, 20, 8,  3, WHITE);
}

void updatetext() {//Update text on Oled display
  display.setCursor(0,  9);
  display.setTextColor(WHITE);
  display.setTextSize(1);
  display.print("Set  Temp: ");
  display.print(settemp);
  display.setCursor(0, 20);
  display.print("Temp:  ");
  display.print(temp);
}

void zeroscale() { //If soldering iron  is unplugged, adjust the input pin value to zero it out
  if (output < 200) {
    display.clearDisplay();

    display.setCursor(0, 9);
    display.setTextColor(WHITE);
    display.setTextSize(1);
    display.print("No soldering iron, or defective");
    display.setCursor(0, 15);
    display.print("iron.");
    display.setCursor(0,  20);
    display.print("Testing in 5 seconds.");

    display.display();
    delay(5000);

    if (output < 200) {
      outputoffset = temp;
    }
    display.clearDisplay();

    display.setCursor(0, 9);
    display.setTextColor(WHITE);
    display.setTextSize(1);
    display.print("Output offset set.");
    display.setCursor(0,  20);
    display.print("Please plug in the iron.");

    display.display();
    do {
      scaleread = analogRead(0);
    } while (scaleread < 200);

  }
}

Code Updated 10/21/2019

c_cpp

Paste in IDE and upload. Only works with shematic.

1#include <Wire.h>
2#include <Adafruit_SSD1306.h>
3#include <Adafruit_GFX.h>
4
5#define  OLED_ADDR   0x3C
6Adafruit_SSD1306 display(-1);
7
8int settemp = 590; //manual  set variables
9
10int output = 0;
11int temp = 0;
12String inputString = "";
13boolean  rap = false;
14boolean stringComplete = false;
15int t = 0;
16int mappedpower  = 0;
17byte powermultiply = 0;
18long counter = 0;
19int temp2 = 0;
20byte outputoffset  = 0;
21byte scaleread = 0;
22
23void setup() {
24  Serial.begin(9600);
25  pinMode(12,  OUTPUT);
26  digitalWrite(12, LOW);
27  display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
28  display.clearDisplay();
29  display.display();
30  rapid();
31}
32
33void  loop() {
34  pid();
35  display.clearDisplay();
36  updatebar();
37  updatetext();
38  display.display();
39}
40
41void rapid() { //Controls the soldering iron by  rapidly heating it up in the beginning.
42  if (rap == false) {
43    digitalWrite(12,  HIGH);
44    output = 255;
45    do {
46      temp = analogRead(0);
47      Serial.print("rapid");
48      Serial.println(temp);
49      display.clearDisplay();
50      updatebar();
51      updatetext();
52      display.display();
53    } while (temp - settemp >  1);
54    digitalWrite(12, LOW);
55    rap = true;
56  }
57}
58
59void pid()  { //Controls the soldering with slow active power heating.
60  temp = analogRead(0);  //Temp averager
61  temp2 = temp;
62  delay(50);
63  temp = analogRead(0);
64  temp = temp + temp2;
65  temp = temp / 2;
66
67  zeroscale(); //activate no  soldering iron checker
68  temp = temp + outputoffset;
69
70  output = temp -  settemp;
71  output = output + powermultiply;
72  output = output * 4;
73
74  if (output < 0) {
75    output = 0;
76  }
77  if (output > 255) {
78    output  = 255;
79  }
80  counter = counter + 1;
81  if (counter > 10) {
82    counter  = 0;
83    if (temp > settemp + 3) {
84      powermultiply = powermultiply + 1;
85    }
86    if (temp < settemp - 3 && powermultiply > 0) {
87      powermultiply  = powermultiply - 1;
88    }
89  }
90  Serial.print(powermultiply);
91  Serial.print(",  ");
92  Serial.print(temp);
93  Serial.print(", ");
94  Serial.println(output);
95  analogWrite(12, output);
96}
97
98void updatebar() { //Updates Powerbar on  OLED display
99  mappedpower = map(output, 0, 255, 0, 127) - 10;
100  display.fillRect(0,  0, mappedpower, 8, WHITE);
101  display.fillRoundRect(mappedpower - 5, 0, 20, 8,  3, WHITE);
102}
103
104void updatetext() {//Update text on Oled display
105  display.setCursor(0,  9);
106  display.setTextColor(WHITE);
107  display.setTextSize(1);
108  display.print("Set  Temp: ");
109  display.print(settemp);
110  display.setCursor(0, 20);
111  display.print("Temp:  ");
112  display.print(temp);
113}
114
115void zeroscale() { //If soldering iron  is unplugged, adjust the input pin value to zero it out
116  if (temp < 200) {
117    display.clearDisplay();
118
119    display.setCursor(0, 20);
120    display.setTextColor(WHITE);
121    display.setTextSize(1);
122    display.print("No soldering iron.");
123    display.display();
124    delay(10000);
125    
126    display.setCursor(0, 0);
127    display.print("Testing  in 5 seconds.");
128
129    display.display();
130    delay(5000);
131
132    if  (temp < 200) {
133      outputoffset = temp;
134    }
135    display.clearDisplay();
136
137    display.setCursor(0, 20);
138    display.setTextColor(WHITE);
139    display.setTextSize(1);
140    display.print("Output offset set.");
141    display.setCursor(0, 0);
142    display.print("Connect  the iron.");
143
144    display.display();
145    do {
146      scaleread = analogRead(0);
147    } while (scaleread < 200);
148
149  }
150}
151

#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>

#define  OLED_ADDR   0x3C
Adafruit_SSD1306 display(-1);

int settemp = 590; //manual  set variables

int output = 0;
int temp = 0;
String inputString = "";
boolean  rap = false;
boolean stringComplete = false;
int t = 0;
int mappedpower  = 0;
byte powermultiply = 0;
long counter = 0;
int temp2 = 0;
byte outputoffset  = 0;
byte scaleread = 0;

void setup() {
  Serial.begin(9600);
  pinMode(12,  OUTPUT);
  digitalWrite(12, LOW);
  display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
  display.clearDisplay();
  display.display();
  rapid();
}

void  loop() {
  pid();
  display.clearDisplay();
  updatebar();
  updatetext();
  display.display();
}

void rapid() { //Controls the soldering iron by  rapidly heating it up in the beginning.
  if (rap == false) {
    digitalWrite(12,  HIGH);
    output = 255;
    do {
      temp = analogRead(0);
      Serial.print("rapid");
      Serial.println(temp);
      display.clearDisplay();
      updatebar();
      updatetext();
      display.display();
    } while (temp - settemp >  1);
    digitalWrite(12, LOW);
    rap = true;
  }
}

void pid()  { //Controls the soldering with slow active power heating.
  temp = analogRead(0);  //Temp averager
  temp2 = temp;
  delay(50);
  temp = analogRead(0);
  temp = temp + temp2;
  temp = temp / 2;

  zeroscale(); //activate no  soldering iron checker
  temp = temp + outputoffset;

  output = temp -  settemp;
  output = output + powermultiply;
  output = output * 4;

  if (output < 0) {
    output = 0;
  }
  if (output > 255) {
    output  = 255;
  }
  counter = counter + 1;
  if (counter > 10) {
    counter  = 0;
    if (temp > settemp + 3) {
      powermultiply = powermultiply + 1;
    }
    if (temp < settemp - 3 && powermultiply > 0) {
      powermultiply  = powermultiply - 1;
    }
  }
  Serial.print(powermultiply);
  Serial.print(",  ");
  Serial.print(temp);
  Serial.print(", ");
  Serial.println(output);
  analogWrite(12, output);
}

void updatebar() { //Updates Powerbar on  OLED display
  mappedpower = map(output, 0, 255, 0, 127) - 10;
  display.fillRect(0,  0, mappedpower, 8, WHITE);
  display.fillRoundRect(mappedpower - 5, 0, 20, 8,  3, WHITE);
}

void updatetext() {//Update text on Oled display
  display.setCursor(0,  9);
  display.setTextColor(WHITE);
  display.setTextSize(1);
  display.print("Set  Temp: ");
  display.print(settemp);
  display.setCursor(0, 20);
  display.print("Temp:  ");
  display.print(temp);
}

void zeroscale() { //If soldering iron  is unplugged, adjust the input pin value to zero it out
  if (temp < 200) {
    display.clearDisplay();

    display.setCursor(0, 20);
    display.setTextColor(WHITE);
    display.setTextSize(1);
    display.print("No soldering iron.");
    display.display();
    delay(10000);
    
    display.setCursor(0, 0);
    display.print("Testing  in 5 seconds.");

    display.display();
    delay(5000);

    if  (temp < 200) {
      outputoffset = temp;
    }
    display.clearDisplay();

    display.setCursor(0, 20);
    display.setTextColor(WHITE);
    display.setTextSize(1);
    display.print("Output offset set.");
    display.setCursor(0, 0);
    display.print("Connect  the iron.");

    display.display();
    do {
      scaleread = analogRead(0);
    } while (scaleread < 200);

  }
}

Control Code

c_cpp

Paste this into the arduino and upload. This only works with the circuit provided

1int output = 0;
2int temp = 0;
3int settemp = 630;
4String inputString  = "";         // a string to hold incoming data
5boolean rap = false;
6boolean  stringComplete = false;  // whether the string is complete
7int t = 0;
8
9void  setup() {
10  Serial.begin(9600);
11  inputString.reserve(200);
12  pinMode(6,  OUTPUT);
13  digitalWrite(6, LOW);
14}
15
16void loop() {
17  serialEvent();
18  if (stringComplete) {
19    Serial.println(inputString);
20    t = inputString.toInt();
21    //settemp = t //sets the set temp to the serial input
22    inputString = "";
23    stringComplete = false;
24  }
25  rapid();
26  pid();
27}
28
29void rapid()  { //Controls the soldering iron by rapidly heating it up in the beginning.
30  if  (rap == false) {
31    digitalWrite(6, HIGH);
32    do {
33      temp = analogRead(0);
34      Serial.print("rapid");
35      Serial.println(temp);
36    } while (temp  - settemp > 10);
37    digitalWrite(6, LOW);
38    rap = true;
39  }
40}
41
42void  pid() { //Controls the soldering with slow active power heating.
43  temp = analogRead(0);
44  output = temp - settemp;
45  if (output < 0) {
46    output = 0;
47  }
48  if (output > 255) {
49    output = 255;
50  }
51  Serial.print("pid");
52  Serial.print(temp);
53  Serial.print(", ");
54  Serial.println(output);
55  analogWrite(6, output);
56}
57
58void serialEvent() {  //Serial communication  that can be used to update settemp
59  while (Serial.available()) {
60    char  inChar = (char)Serial.read();
61    inputString += inChar;
62    if (inChar ==  '\n') {
63      stringComplete = true;
64    }
65  }
66}
67
68

int output = 0;
int temp = 0;
int settemp = 630;
String inputString  = "";         // a string to hold incoming data
boolean rap = false;
boolean  stringComplete = false;  // whether the string is complete
int t = 0;

void  setup() {
  Serial.begin(9600);
  inputString.reserve(200);
  pinMode(6,  OUTPUT);
  digitalWrite(6, LOW);
}

void loop() {
  serialEvent();
  if (stringComplete) {
    Serial.println(inputString);
    t = inputString.toInt();
    //settemp = t //sets the set temp to the serial input
    inputString = "";
    stringComplete = false;
  }
  rapid();
  pid();
}

void rapid()  { //Controls the soldering iron by rapidly heating it up in the beginning.
  if  (rap == false) {
    digitalWrite(6, HIGH);
    do {
      temp = analogRead(0);
      Serial.print("rapid");
      Serial.println(temp);
    } while (temp  - settemp > 10);
    digitalWrite(6, LOW);
    rap = true;
  }
}

void  pid() { //Controls the soldering with slow active power heating.
  temp = analogRead(0);
  output = temp - settemp;
  if (output < 0) {
    output = 0;
  }
  if (output > 255) {
    output = 255;
  }
  Serial.print("pid");
  Serial.print(temp);
  Serial.print(", ");
  Serial.println(output);
  analogWrite(6, output);
}

void serialEvent() {  //Serial communication  that can be used to update settemp
  while (Serial.available()) {
    char  inChar = (char)Serial.read();
    inputString += inChar;
    if (inChar ==  '\n') {
      stringComplete = true;
    }
  }
}

Code Updated 10/21/2019

c_cpp

Paste in IDE and upload. Only works with shematic.

1#include <Wire.h>
2#include <Adafruit_SSD1306.h>
3#include <Adafruit_GFX.h>
4
5#define   OLED_ADDR   0x3C
6Adafruit_SSD1306 display(-1);
7
8int settemp = 590; //manual   set variables
9
10int output = 0;
11int temp = 0;
12String inputString = "";
13boolean   rap = false;
14boolean stringComplete = false;
15int t = 0;
16int mappedpower   = 0;
17byte powermultiply = 0;
18long counter = 0;
19int temp2 = 0;
20byte outputoffset   = 0;
21byte scaleread = 0;
22
23void setup() {
24  Serial.begin(9600);
25  pinMode(12,   OUTPUT);
26  digitalWrite(12, LOW);
27  display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
28   display.clearDisplay();
29  display.display();
30  rapid();
31}
32
33void   loop() {
34  pid();
35  display.clearDisplay();
36  updatebar();
37  updatetext();
38   display.display();
39}
40
41void rapid() { //Controls the soldering iron by   rapidly heating it up in the beginning.
42  if (rap == false) {
43    digitalWrite(12,   HIGH);
44    output = 255;
45    do {
46      temp = analogRead(0);
47      Serial.print("rapid");
48       Serial.println(temp);
49      display.clearDisplay();
50      updatebar();
51       updatetext();
52      display.display();
53    } while (temp - settemp >   1);
54    digitalWrite(12, LOW);
55    rap = true;
56  }
57}
58
59void pid()   { //Controls the soldering with slow active power heating.
60  temp = analogRead(0);   //Temp averager
61  temp2 = temp;
62  delay(50);
63  temp = analogRead(0);
64   temp = temp + temp2;
65  temp = temp / 2;
66
67  zeroscale(); //activate no   soldering iron checker
68  temp = temp + outputoffset;
69
70  output = temp -   settemp;
71  output = output + powermultiply;
72  output = output * 4;
73
74   if (output < 0) {
75    output = 0;
76  }
77  if (output > 255) {
78    output   = 255;
79  }
80  counter = counter + 1;
81  if (counter > 10) {
82    counter   = 0;
83    if (temp > settemp + 3) {
84      powermultiply = powermultiply + 1;
85     }
86    if (temp < settemp - 3 && powermultiply > 0) {
87      powermultiply   = powermultiply - 1;
88    }
89  }
90  Serial.print(powermultiply);
91  Serial.print(",   ");
92  Serial.print(temp);
93  Serial.print(", ");
94  Serial.println(output);
95   analogWrite(12, output);
96}
97
98void updatebar() { //Updates Powerbar on   OLED display
99  mappedpower = map(output, 0, 255, 0, 127) - 10;
100  display.fillRect(0,   0, mappedpower, 8, WHITE);
101  display.fillRoundRect(mappedpower - 5, 0, 20, 8,   3, WHITE);
102}
103
104void updatetext() {//Update text on Oled display
105  display.setCursor(0,   9);
106  display.setTextColor(WHITE);
107  display.setTextSize(1);
108  display.print("Set   Temp: ");
109  display.print(settemp);
110  display.setCursor(0, 20);
111  display.print("Temp:   ");
112  display.print(temp);
113}
114
115void zeroscale() { //If soldering iron   is unplugged, adjust the input pin value to zero it out
116  if (temp < 200) {
117     display.clearDisplay();
118
119    display.setCursor(0, 20);
120    display.setTextColor(WHITE);
121     display.setTextSize(1);
122    display.print("No soldering iron.");
123    display.display();
124     delay(10000);
125    
126    display.setCursor(0, 0);
127    display.print("Testing   in 5 seconds.");
128
129    display.display();
130    delay(5000);
131
132    if   (temp < 200) {
133      outputoffset = temp;
134    }
135    display.clearDisplay();
136
137     display.setCursor(0, 20);
138    display.setTextColor(WHITE);
139    display.setTextSize(1);
140     display.print("Output offset set.");
141    display.setCursor(0, 0);
142    display.print("Connect   the iron.");
143
144    display.display();
145    do {
146      scaleread = analogRead(0);
147     } while (scaleread < 200);
148
149  }
150}
151

#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>

#define   OLED_ADDR   0x3C
Adafruit_SSD1306 display(-1);

int settemp = 590; //manual   set variables

int output = 0;
int temp = 0;
String inputString = "";
boolean   rap = false;
boolean stringComplete = false;
int t = 0;
int mappedpower   = 0;
byte powermultiply = 0;
long counter = 0;
int temp2 = 0;
byte outputoffset   = 0;
byte scaleread = 0;

void setup() {
  Serial.begin(9600);
  pinMode(12,   OUTPUT);
  digitalWrite(12, LOW);
  display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
   display.clearDisplay();
  display.display();
  rapid();
}

void   loop() {
  pid();
  display.clearDisplay();
  updatebar();
  updatetext();
   display.display();
}

void rapid() { //Controls the soldering iron by   rapidly heating it up in the beginning.
  if (rap == false) {
    digitalWrite(12,   HIGH);
    output = 255;
    do {
      temp = analogRead(0);
      Serial.print("rapid");
       Serial.println(temp);
      display.clearDisplay();
      updatebar();
       updatetext();
      display.display();
    } while (temp - settemp >   1);
    digitalWrite(12, LOW);
    rap = true;
  }
}

void pid()   { //Controls the soldering with slow active power heating.
  temp = analogRead(0);   //Temp averager
  temp2 = temp;
  delay(50);
  temp = analogRead(0);
   temp = temp + temp2;
  temp = temp / 2;

  zeroscale(); //activate no   soldering iron checker
  temp = temp + outputoffset;

  output = temp -   settemp;
  output = output + powermultiply;
  output = output * 4;

   if (output < 0) {
    output = 0;
  }
  if (output > 255) {
    output   = 255;
  }
  counter = counter + 1;
  if (counter > 10) {
    counter   = 0;
    if (temp > settemp + 3) {
      powermultiply = powermultiply + 1;
     }
    if (temp < settemp - 3 && powermultiply > 0) {
      powermultiply   = powermultiply - 1;
    }
  }
  Serial.print(powermultiply);
  Serial.print(",   ");
  Serial.print(temp);
  Serial.print(", ");
  Serial.println(output);
   analogWrite(12, output);
}

void updatebar() { //Updates Powerbar on   OLED display
  mappedpower = map(output, 0, 255, 0, 127) - 10;
  display.fillRect(0,   0, mappedpower, 8, WHITE);
  display.fillRoundRect(mappedpower - 5, 0, 20, 8,   3, WHITE);
}

void updatetext() {//Update text on Oled display
  display.setCursor(0,   9);
  display.setTextColor(WHITE);
  display.setTextSize(1);
  display.print("Set   Temp: ");
  display.print(settemp);
  display.setCursor(0, 20);
  display.print("Temp:   ");
  display.print(temp);
}

void zeroscale() { //If soldering iron   is unplugged, adjust the input pin value to zero it out
  if (temp < 200) {
     display.clearDisplay();

    display.setCursor(0, 20);
    display.setTextColor(WHITE);
     display.setTextSize(1);
    display.print("No soldering iron.");
    display.display();
     delay(10000);
    
    display.setCursor(0, 0);
    display.print("Testing   in 5 seconds.");

    display.display();
    delay(5000);

    if   (temp < 200) {
      outputoffset = temp;
    }
    display.clearDisplay();

     display.setCursor(0, 20);
    display.setTextColor(WHITE);
    display.setTextSize(1);
     display.print("Output offset set.");
    display.setCursor(0, 0);
    display.print("Connect   the iron.");

    display.display();
    do {
      scaleread = analogRead(0);
     } while (scaleread < 200);

  }
}

Control Code

c_cpp

Paste this into the arduino and upload. This only works with the circuit provided

1int output = 0;
2int temp = 0;
3int settemp = 630;
4String inputString
5  = "";         // a string to hold incoming data
6boolean rap = false;
7boolean
8  stringComplete = false;  // whether the string is complete
9int t = 0;
10
11void
12  setup() {
13  Serial.begin(9600);
14  inputString.reserve(200);
15  pinMode(6,
16  OUTPUT);
17  digitalWrite(6, LOW);
18}
19
20void loop() {
21  serialEvent();
22
23  if (stringComplete) {
24    Serial.println(inputString);
25    t = inputString.toInt();
26
27    //settemp = t //sets the set temp to the serial input
28    inputString = "";
29
30    stringComplete = false;
31  }
32  rapid();
33  pid();
34}
35
36void rapid()
37  { //Controls the soldering iron by rapidly heating it up in the beginning.
38  if
39  (rap == false) {
40    digitalWrite(6, HIGH);
41    do {
42      temp = analogRead(0);
43
44      Serial.print("rapid");
45      Serial.println(temp);
46    } while (temp
47  - settemp > 10);
48    digitalWrite(6, LOW);
49    rap = true;
50  }
51}
52
53void
54  pid() { //Controls the soldering with slow active power heating.
55  temp = analogRead(0);
56
57  output = temp - settemp;
58  if (output < 0) {
59    output = 0;
60  }
61
62  if (output > 255) {
63    output = 255;
64  }
65  Serial.print("pid");
66
67  Serial.print(temp);
68  Serial.print(", ");
69  Serial.println(output);
70
71  analogWrite(6, output);
72}
73
74void serialEvent() {  //Serial communication
75  that can be used to update settemp
76  while (Serial.available()) {
77    char
78  inChar = (char)Serial.read();
79    inputString += inChar;
80    if (inChar ==
81  '\
82') {
83      stringComplete = true;
84    }
85  }
86}
87
88

int output = 0;
int temp = 0;
int settemp = 630;
String inputString
  = "";         // a string to hold incoming data
boolean rap = false;
boolean
  stringComplete = false;  // whether the string is complete
int t = 0;

void
  setup() {
  Serial.begin(9600);
  inputString.reserve(200);
  pinMode(6,
  OUTPUT);
  digitalWrite(6, LOW);
}

void loop() {
  serialEvent();

  if (stringComplete) {
    Serial.println(inputString);
    t = inputString.toInt();

    //settemp = t //sets the set temp to the serial input
    inputString = "";

    stringComplete = false;
  }
  rapid();
  pid();
}

void rapid()
  { //Controls the soldering iron by rapidly heating it up in the beginning.
  if
  (rap == false) {
    digitalWrite(6, HIGH);
    do {
      temp = analogRead(0);

      Serial.print("rapid");
      Serial.println(temp);
    } while (temp
  - settemp > 10);
    digitalWrite(6, LOW);
    rap = true;
  }
}

void
  pid() { //Controls the soldering with slow active power heating.
  temp = analogRead(0);

  output = temp - settemp;
  if (output < 0) {
    output = 0;
  }

  if (output > 255) {
    output = 255;
  }
  Serial.print("pid");

  Serial.print(temp);
  Serial.print(", ");
  Serial.println(output);

  analogWrite(6, output);
}

void serialEvent() {  //Serial communication
  that can be used to update settemp
  while (Serial.available()) {
    char
  inChar = (char)Serial.read();
    inputString += inChar;
    if (inChar ==
  '\
') {
      stringComplete = true;
    }
  }
}

Downloadable files

Control Circut

Use this schematic to create a circuit for the iron

Control Circut

Use this schematic to create a circuit for the iron

Control Circut

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