Reflow Oven Controller - Attiny 461-based

[mike_58]

Have a look at : https://github.com/0xPIT/reflowOvenController - seams more advanced and with TFT ...
http://www.ebay.com/itm/272074791359?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1558.l2649

[mike_58]

This diode will sit inside the oven right ?
What will you use as solder to connect to its wires ?

I want use this small custom PCB to hold diode in reflow oven


No need to solder anything

alternative solution:


I've in my toolbox something like this for PCB and heatsinks assembly

not a good idea... poprivets are aluminum... not guaranteed a good electrical contact. plus you are probably creating four thermocouple junctions  as well as you have dissimilar metals... (cable -> board - board - diode cathode , diode  anode ->board - board -> cable.

i would try this out first before you develop this thing... my gut feeling say 'trouble'....  even if it works that diode die due to electromigration effects.

you are running the thing waaaay too hot. and powered up

Cuper Rivets are avalible as well (Al, Stainless steel, coated,..)

[fcb]

AFAIK no commercial or even hobby level reflow oven uses semiconductor junction temperature sensing - it seems really daft as thermocouples are cheap, come with long leads and are well characterized.

The diode is not designed for cycling at the temperatures your going to need - at least not for long.

Does "not designed for" preclude the possibility that it could work? The OP may add something to the design of reflow temperature sensing.

I'm curious why 4 sensors are needed. It seems to suggest the possibility of uneven temperature. Which one will be used to control the reflow?

Of course your right - I'm not precluding the possibility it might work.

But I can't see any reason you would even try a diode sensor at those temperatures unless you needed to make an ultra cheap device, even then thermocouples will be easier to mount than riveting a diode onto a bit of insulator.

[wraper]

I haven't found the time to install the controller into the oven. Partially, because manually controlling the temperature worked pretty well for several boards so far - switching the heaters on and off while monitoring the temperature with the Multimeter.

Human PID?