DIY CD Spot Welder - Part 1

I want to make a CD spot welder for battery packs or other stuff that cannot be soldered.

Jan 23, 2019

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Devices & Components

Arduino Micro

100W Mosfet

LSP-1403

RGB Backlight LCD - 16x2

Perf+ 2

Resistor 220 ohm

Pushbutton switch 12mm

Rotary potentiometer (generic)

Resistor 100k ohm

Supercap 50F

Hardware & Tools

Soldering iron (generic)

Software & Tools

Arduino IDE

Project description

Code

CD_spot_welder_Serial.ino

c_cpp

I fixed all problems, but it's not cleaned up. The full code comes with part 2.

1int MOSFETpin = 3;
2int footswitchorbutton = 2;
3
4int dlay = 0;
5unsigned  long timetilnext;
6unsigned long locksec;
7int oneafterlocked;
8int prevdlay;
9int  prevlock;
10
11void setup() {
12  pinMode(MOSFETpin,OUTPUT);
13  pinMode(footswitchorbutton,INPUT_PULLUP);
14  pinMode(A5,INPUT);
15  Serial.begin(9600);
16  timetilnext = millis();
17  locksec  = 0;
18}
19
20void loop() {
21  
22  if(millis() <= timetilnext){
23    locksec  = (timetilnext-millis())/1000;
24    if(locksec != prevlock){
25    Serial.print("locked  for:");
26    Serial.print(locksec);
27    Serial.println("s");
28    prevlock  = locksec;
29    }
30    oneafterlocked = 1;
31  }
32  
33  
34  dlay = map(analogRead(A5),0,1023,1,15);
35  dlay = dlay*10;
36  
37  if(millis() >= timetilnext){
38
39  if(dlay != prevdlay  || oneafterlocked == 1){
40  Serial.print("Pulse:");
41  Serial.print(dlay);
42  Serial.println("ms");
43  oneafterlocked = 0;
44  prevdlay = dlay;
45  }
46  if(digitalRead(footswitchorbutton) == LOW){
47    digitalWrite(MOSFETpin,HIGH);
48    delay(dlay);
49    digitalWrite(MOSFETpin,LOW);
50    timetilnext = 5000+millis();
51  }
52  }
53  
54}
55

int MOSFETpin = 3;
int footswitchorbutton = 2;

int dlay = 0;
unsigned  long timetilnext;
unsigned long locksec;
int oneafterlocked;
int prevdlay;
int  prevlock;

void setup() {
  pinMode(MOSFETpin,OUTPUT);
  pinMode(footswitchorbutton,INPUT_PULLUP);
  pinMode(A5,INPUT);
  Serial.begin(9600);
  timetilnext = millis();
  locksec  = 0;
}

void loop() {
  
  if(millis() <= timetilnext){
    locksec  = (timetilnext-millis())/1000;
    if(locksec != prevlock){
    Serial.print("locked  for:");
    Serial.print(locksec);
    Serial.println("s");
    prevlock  = locksec;
    }
    oneafterlocked = 1;
  }
  
  
  dlay = map(analogRead(A5),0,1023,1,15);
  dlay = dlay*10;
  
  if(millis() >= timetilnext){

  if(dlay != prevdlay  || oneafterlocked == 1){
  Serial.print("Pulse:");
  Serial.print(dlay);
  Serial.println("ms");
  oneafterlocked = 0;
  prevdlay = dlay;
  }
  if(digitalRead(footswitchorbutton) == LOW){
    digitalWrite(MOSFETpin,HIGH);
    delay(dlay);
    digitalWrite(MOSFETpin,LOW);
    timetilnext = 5000+millis();
  }
  }
  
}

CD_spot_welder_Serial.ino

c_cpp

I fixed all problems, but it's not cleaned up. The full code comes with part 2.

1int MOSFETpin = 3;
2int footswitchorbutton = 2;
3
4int dlay = 0;
5unsigned   long timetilnext;
6unsigned long locksec;
7int oneafterlocked;
8int prevdlay;
9int   prevlock;
10
11void setup() {
12  pinMode(MOSFETpin,OUTPUT);
13  pinMode(footswitchorbutton,INPUT_PULLUP);
14   pinMode(A5,INPUT);
15  Serial.begin(9600);
16  timetilnext = millis();
17  locksec   = 0;
18}
19
20void loop() {
21  
22  if(millis() <= timetilnext){
23    locksec   = (timetilnext-millis())/1000;
24    if(locksec != prevlock){
25    Serial.print("locked   for:");
26    Serial.print(locksec);
27    Serial.println("s");
28    prevlock   = locksec;
29    }
30    oneafterlocked = 1;
31  }
32  
33  
34  dlay = map(analogRead(A5),0,1023,1,15);
35   dlay = dlay*10;
36  
37  if(millis() >= timetilnext){
38
39  if(dlay != prevdlay   || oneafterlocked == 1){
40  Serial.print("Pulse:");
41  Serial.print(dlay);
42   Serial.println("ms");
43  oneafterlocked = 0;
44  prevdlay = dlay;
45  }
46   if(digitalRead(footswitchorbutton) == LOW){
47    digitalWrite(MOSFETpin,HIGH);
48     delay(dlay);
49    digitalWrite(MOSFETpin,LOW);
50    timetilnext = 5000+millis();
51   }
52  }
53  
54}
55

int MOSFETpin = 3;
int footswitchorbutton = 2;

int dlay = 0;
unsigned   long timetilnext;
unsigned long locksec;
int oneafterlocked;
int prevdlay;
int   prevlock;

void setup() {
  pinMode(MOSFETpin,OUTPUT);
  pinMode(footswitchorbutton,INPUT_PULLUP);
   pinMode(A5,INPUT);
  Serial.begin(9600);
  timetilnext = millis();
  locksec   = 0;
}

void loop() {
  
  if(millis() <= timetilnext){
    locksec   = (timetilnext-millis())/1000;
    if(locksec != prevlock){
    Serial.print("locked   for:");
    Serial.print(locksec);
    Serial.println("s");
    prevlock   = locksec;
    }
    oneafterlocked = 1;
  }
  
  
  dlay = map(analogRead(A5),0,1023,1,15);
   dlay = dlay*10;
  
  if(millis() >= timetilnext){

  if(dlay != prevdlay   || oneafterlocked == 1){
  Serial.print("Pulse:");
  Serial.print(dlay);
   Serial.println("ms");
  oneafterlocked = 0;
  prevdlay = dlay;
  }
   if(digitalRead(footswitchorbutton) == LOW){
    digitalWrite(MOSFETpin,HIGH);
     delay(dlay);
    digitalWrite(MOSFETpin,LOW);
    timetilnext = 5000+millis();
   }
  }
  
}

Downloadable files

The scematic

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