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Homemade Soldering Station 2 (AVR)Author
Hercules Trapierakis
January 15, 2012

PAGE 2 of 5 - Schematics


i decided not to put on the same board the controller and triac

The controller board



on X1 you power the board from 7VDC to 15VDC ( + on pin1 )

on X3 you connect the thermocouple pair ( +on pin1 )

X5 is for feature use

you power the led and optocoupler form X6 and X4 ( the two middle pins are ground )


And here is the Triac Board




Resistors and Potentiometers - Controller
R1Resistor 470 Ohm 1/4 Watt 5% Carbon Film 
R2Resistor 470 Ohm 1/4 Watt 5% Carbon Film 
R3Resistor 1 KOhm 1/4 Watt 5% Carbon Film 
R4Resistor 1 KOhm 1/4 Watt 5% Carbon Film 
R5Potentiometer 1 KOhm Linear Rotary 1/2W
R6Potentiometer 1 KOhm Linear Rotary 1/2W
R7Potentiometer 1 KOhm Linear Rotary 1/2W
R8Potentiometer 1 KOhm Linear Rotary 1/2W
R9Potentiometer 1 KOhm Linear Rotary 1/2W
R10Potentiometer 1 KOhm Linear Rotary 1/2W
Capacitors - Controller
C1Electrolytic Capacitor 470 uF 25 Volts
C4Electrolytic Capacitor 220 uF 25 Volts
C3Ceramic Capacitor 0.1 uF 50 Volts
C5Ceramic Capacitor 0.1 uF 50 Volts
C2Ceramic Capacitor 0.1 uF 50 Volts
C6Ceramic Capacitor 0.1 uF 50 Volts
Diodes - Controller
D11N4004 General Purpose Diode Rectifier 
Transistors - Controller
T12N3904 NPN General Purpose Amplifie 
IC's - Controller
IC17805 Positive Voltage Regulator 
IC2ATmega8 Microcontroller 
IC3MAX 6675 Cold-junction compensated K-Thermocouple to digital converter (0°C to +1024°C) 
Other - Controller
LCD 16x2 Character LCD w/ HD44780U1 controller 
Resistors and Potentiometers - Triac
R1Resistor 470 Ohm 1/4 Watt 5% Carbon Film 
R2Resistor 470 Ohm 1/4 Watt 5% Carbon Film 
Transistors - Triac
T12N3904 NPN General Purpose Amplifie 
IC's - Triac
IC1MOC3021 Random Phase Optoisolator TRIAC Driver Output 



Download file
Eagle files of the Controller board ( sch & brd )


Download file
Eagle files of the Triac board ( sch & brd )


Continue reading. Click here to go to the next page >>>.
 OR click here to view the presentation.



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  • At 7 September 2015, 16:51:19 user Berlin_Mitte wrote:   [reply @ Berlin_Mitte]
      • Please provide me source code? thank you.
      Email: Berlin_Mitte1@yahoo.com

  • At 11 July 2013, 7:58:45 user Luigi wrote:   [reply @ Luigi]
      • Pictures detailed are not available.
      Hex file download need explain to describe how are created (IDE AVR STUDIO) to prform corect upload, please.
      Thanks.

  • At 14 March 2013, 17:12:46 user Jay Stillz wrote:   [reply @ Jay Stillz]
      • Do you think its possible to convert a pitbull turbo charger, pibull x3 (http://www.competitionelectronics.com/retired-rc-products.html), into a digital slodering station ??

  • At 23 February 2013, 10:34:29 user Michael wrote:   [reply @ Michael]
      • @Hercules Trapierakis Can you please provide us with the source code? thanks!

  • At 5 September 2012, 20:44:46 user Teo wrote:   [reply @ Teo]
      • Hi, good work!

      Can you post a C code of this solder station?
      Sorry, but i've arduino uno, i have flashed a bottloader into atmel 8, and i want to load the scatch on this chip.
      i can't load hex code with arduino, right?

  • At 7 August 2012, 21:03:18 user Chris wrote:   [reply @ Chris]
      • @Hercules Trapierakis
      Hi - could you please provide me with the source code?
      That knob on the front-panel - is that a potentiometer or rotary encoder?

  • At 6 August 2012, 2:58:59 user metal wrote:   [reply @ metal]
      • Where can I find the source code :(

  • At 28 July 2012, 14:22:53 user Rohit Soni wrote:   [reply @ Rohit Soni]
      • hey hiii... please provide me the source code for this as i m using opamp for thermocouple.... so need to apply some changes to it to work out wid pid... thanks....
      bestbuddyrohit@gmail.com

  • At 11 April 2012, 6:53:57 user Hercules Trapierakis wrote:   [reply @ Hercules Trapierakis]
      • @Pantelis

      use this one: Controller firmware with P = Kp * Error

      the time is selected with R9

  • At 10 April 2012, 19:15:45 user Pantelis wrote:   [reply @ Pantelis]
      • Hello everybody, i made this circuit but i am stacked to the hardest part of the project, i want to programm the avr. I will make this circuit on the breadboard http://electronics-diy.com/avr_programmer.php but i can't understand witch one hex to use,should i place R5-R9, i have understand what PID is ,but i don't know if its a must. If i use these i will have a better accuracy at the pointed temperature i have select?
      Who can i determine the time that the solder iron will shut down?

  • At 24 January 2012, 9:55:08 user herctrap wrote:   [reply @ herctrap]
      • @Kammenos

      no i haven't

      but Yiannis sais that fair easy to make it

  • At 24 January 2012, 9:46:15 user Kammenos wrote:   [reply @ Kammenos]
      • @herctrap have you tried this bungard sur tin?

  • At 23 January 2012, 23:46:53 user herctrap wrote:   [reply @ herctrap]
      • @Kammenos

      http://img515.imageshack.us/img515/9435/120123081420.jpg

      http://img40.imageshack.us/img40/8284/120123081322.jpg

      mine with flx and solder no chemicals

      -----------------------------------

      search for bungard sur tin

  • At 23 January 2012, 10:54:16 user Kammenos wrote:   [reply @ Kammenos]
      • @herctrap Yes we want a video with the tinning method! ;) ;) I have found some chemicals for chemical tinning, but i can only order large quantities since they are hazard liquids

  • At 23 January 2012, 6:30:32 user herctrap wrote:   [reply @ herctrap]
      • @stij

      yes with a lot of flux and solder

      but i have learned to do it better

      [URL=http://img515.imageshack.us/img515/9435/120123081420.jpg][IMG]http://img515.imageshack.us/img515/9435/120123081420.th.jpg[/IMG][/URL]

      [URL=http://img40.imageshack.us/img40/8284/120123081322.jpg][IMG]http://img40.imageshack.us/img40/8284/120123081322.th.jpg[/IMG][/URL]

      if you want i will make a video next time

  • At 22 January 2012, 23:00:59 user Kammenos wrote:   [reply @ Kammenos]
      • @stij i suppose with the soldering iron and solder ???

  • At 22 January 2012, 22:50:27 user stij wrote:   [reply @ stij]
      • how do you tin the pcb board and it is silver?

  • At 18 January 2012, 20:45:17 user herctrap wrote:   [reply @ herctrap]
      • user friendly

      you can set easily the Kp Ki Kd factors

      -------------

      i actually used it as a P controller only
      i didnt use the pots - i programm it from the software

  • At 18 January 2012, 17:19:45 user Kammenos wrote:   [reply @ Kammenos]
      • one question, why you used potentiometers to set PID values and temp values? Any particular reason?

  • At 18 January 2012, 17:15:54 user Kammenos wrote:   [reply @ Kammenos]
      • Let me say that once more: I envy the "auto turn off" function. If i had time to work with my soldering station, i would add it.



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