Dangerous Soldering Iron driver V1.5(based on Arhi's gen3)

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Re: Dangerous Soldering Iron driver V1.5(based on Arhi's gen

Postby arhi » Tue Jan 17, 2012 5:11 pm

Any NTC will work. You just need to make a proper lookup table in your firmware for the R32/R33 voltage divider. For 100-200k NTC a 10k is good choice for voltage divider. If you go with smaller value NTC like 2k then you want to use 4k7 for the voltage divider... Then you need to implement in firmware the NTC you used, every NTC is "special" so you need table for specific NTC you use. You can check out the GEN3 firmware and adapt it (probably just fixing the hardware.h might get you running). There you will find a table for 204GT NTC.
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Re: Dangerous Soldering Iron driver V1.5(based on Arhi's gen

Postby arakis » Tue Jan 17, 2012 5:14 pm

BTW, I jsut soldered up my own V1. well the power supply that is...and it works without problems, I'll solder up the analog section tomorrow and tell you my results...This is the first time this board has been soldered...so anything can happen :)
best regards FIlip.
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Re: Dangerous Soldering Iron driver V1.5(based on Arhi's gen

Postby ginpb » Tue Jan 17, 2012 5:18 pm

great, thanks
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Re: Dangerous Soldering Iron driver V1.5(based on Arhi's gen

Postby arakis » Tue Jan 17, 2012 6:16 pm

did some preliminary tests with the analog section, I think my mcp617 died before I put it into the board, because there was a constant 3V output, when there should have been noe, I replaced it with a lm358...and now the funny stuff happened, it did measure the k-type TC as it should...but I think I might have soldered a wrong resistor somewhere because the amplification was way off....the range was 50mV when no heat is applied to the TC, and 0.5 when a soldering iron i brought into contact with the TC...

I'll continue to debug it...the major this is I have no mcp617 locally, and for them to arrive is gonna be a long wait....
best regards FIlip.
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Re: Dangerous Soldering Iron driver V1.5(based on Arhi's gen

Postby arhi » Wed Jan 18, 2012 1:10 am

that preliminary test you made with old DP board?
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Re: Dangerous Soldering Iron driver V1.5(based on Arhi's gen

Postby arakis » Wed Jan 18, 2012 1:38 am

yup...I mussed have gotten my resistors wrong, I'll check up on it today...
best regards FIlip.
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Re: Dangerous Soldering Iron driver V1.5(based on Arhi's gen

Postby ginpb » Wed Jan 18, 2012 6:12 am

The jp1 jumper, what is for?
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Re: Dangerous Soldering Iron driver V1.5(based on Arhi's gen

Postby ginpb » Wed Jan 18, 2012 6:54 am

when you have to get a triac and a triac optocoupler, which parameters do you have to look?.I have a bta06sw triac, and a IL410 but i don't are sure that they can work together.
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Re: Dangerous Soldering Iron driver V1.5(based on Arhi's gen

Postby Loki » Wed Jan 18, 2012 9:03 am

I am wandering, is there any chance to use some other, cheaper, pin-compatible pic for example without USB stack build-in? I don`t like the idea to connect this station to my PC without any isolation.
Great project and congratulations!

p.s. sorry for my english
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Re: Dangerous Soldering Iron driver V1.5(based on Arhi's gen

Postby ian » Wed Jan 18, 2012 9:11 am

You don't have to use the USB, it is only there for upgrades and debugging for developers.

I think there are other PICs with the same pinout, but note that we use a lot of peripherals so it will need to exactly match ADC and PWM locations. Also, you will of course need to recompile the firmware to work with the new PIC.
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Re: Dangerous Soldering Iron driver V1.5(based on Arhi's gen

Postby ginpb » Wed Jan 18, 2012 9:12 am

18f2550 can be replaced with a 16f876a for example (I believe that you can use any 28 pin pic, not sure) but do you have to rewrite the firmware.
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Re: Dangerous Soldering Iron driver V1.5(based on Arhi's gen

Postby arhi » Wed Jan 18, 2012 11:00 am

if the isolation is the only problem, just put the 18F2550 in and don't use the usb. Mine firmware don't use USB at all and I didn't even populate the USB connector on my boards... 18F2550 is pretty cheap and you will really have hard time finding a good replacement for it that's cheaper. Just use the 18F2550 and ignore the usb connector

Also, 16F has half the flash 18F has so you'd really have to optimize your firmware and remove all fancy menus (calibration etc) .. it's not worth it for the difference of few bucks if even that much
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Re: Dangerous Soldering Iron driver V1.5(based on Arhi's gen

Postby arakis » Wed Jan 18, 2012 11:13 am

A good idea would be to use IC sockets, that way you can have the pic18f2550 and when you get tired of the SID there are a gazilion projects online for them.... you can reuse it...
best regards FIlip.
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Re: Dangerous Soldering Iron driver V1.5(based on Arhi's gen

Postby Loki » Wed Jan 18, 2012 11:19 am

Arhi argumentation conviced me. I was thinking about designig my own version of the SID by I will build your version beacouse it is well tested an I see that you put a lot of work in this design. Great work once again!
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Re: Dangerous Soldering Iron driver V1.5(based on Arhi's gen

Postby sqkybeaver » Wed Jan 18, 2012 11:19 am

keeping a spare 18f2550 programmed with pickit2 firmware is good idea if you blow up your programmer.
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