Soldering iron driver update

Arhi continues to develop the universal soldering iron driver. This is a rendering of the third generation PCB.

The soldering iron driver can use soldering pencils with K-type or PTC type temperature sensors like Solomon, Hakko, and Weller, to name a few…

Generation 3 has a reworked analog section. It that now fully supports PTC type irons. A few more buttons are added, as well as a temperature probe to help with temperature control tuning.

We are impressed with his design, and can’t wait to build our version to experiment with.

Via the forum.

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  1. btw, the 3 gray cubes with 3 pins sticking out of them – those are actually pot’s :D
    The 2 pin sil receptacles should actually be jumpers
    red cube is USB-B trough hole connector (I hate small ones)
    green cubes are terminal connector (5mm pitch, I use the ones with screws to hold wires tight)

    PCB ain’t very nice but should work properly, all power traces are nice and fat… I’m waiting for ITead to send boards so I can do a final test with the analog section (worked perfectly on proto board, let’s see if I transferred that correctly to pcb :D )

    Using all smd (pic, dcdc, opto’s, fet, triac) and smaller edge connectors this could even be routed on 5x5cm board but I intentionally used some PTH’s that I have in drawers in order to lower the stock of trough hole parts I own :D, also not sure 5x5cm would allow for fat traces, we are pushing over 2A into the heater.

    1. I will get 8, I need 4 and I already have 3 dibs so you can have one just send me your address and I’ll ship you one when they arrive from ITead (that will probably be in ~3 weeks as it takes long time for stuff to come here from PRC).

      GERBER/EXCELLON files are on forum so anyone can make them too, I also entered them in ITead’s “open pcb” pool so you maybe get them from itead if you enter your pcb’s into openpcb there too :)

      Anyhow, the firmware development for the 18F version has not even started yet (I’m kinda pressed for time) so waiting for boards should be ok. Also, I don’t recommend anyone order any boards before I actually test this design. The previous design worked perfectly with TC but had serious issues with RTD… after I test this design I’ll post updates (and maybe add small changes to the board) so then it will be safe to go for it :D

  2. Arhi, I remember reading somewhere you would no longer use PIC’s and focus more on AVR’s. Yet this design, while awesome, still features a PIC. Any particular reason, or have you changed your political view in the meantime? :)

    1. It’s mainly because the mcu in this project is less important then the signal conditioning part (firmware here is very simple). Second reason is that I have a stock of trough hole pic’s (you see on my pcb that pic is trough hole :D ) that I want to use up. That’s why gen1/2 are with 16F690 and gen2 is with 18f2550

      Now wrt AVR’s. I’m not switching any of my 8bit mcu work from microchip. I do tend not to use 8bit mcu’s but I still have number of 16F690’s 18F4550 and 18F2550 in stock .. For the bit more complex products I moved to 32bit mcu’s and that’s where I completely stopped work on the pic32mx and moved to STM32 and AVR32 … and all my 16bit work I moved from Microchip to TI (not that TI is much more open the Microchip but ..)…

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