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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Components and supplies

100W Mosfet

LSP-1403

RGB Backlight LCD - 16x2

Perf+ 2

Arduino Micro

Resistor 220 ohm

Pushbutton switch 12mm

Rotary potentiometer (generic)

Resistor 100k ohm

Supercap 50F

Tools and machines

Soldering iron (generic)

Apps and platforms

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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