How To Build A Solder Reflow Oven - The Byte Sized Engineer | DigiKey

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If you want to assemble a batch of PCBs with surface mount components you have a few options. You could use a regular soldering iron and magnification and do it all by hand. Or you could use a hot air reflow station to heat up the board and components until the solder melts. But if you have a lot of components or a large batch of PCBs to assemble this could get tedious. In this video I use an Arduino board, a thermocouple, and a solid state relay to build a solder reflow oven using a standard toaster oven. I use a TFT display with a touchscreen display to create a user interface that plots the solder reflow profile.

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The knob is to keep you from putting it directly against the wall where it might overheat or start a fire.

emmettturner

If you are looking for a YouTube idea, I'd love a tutorial on tuning and programming a PID loop in the real world. Taht, after all, is where the magic is in this project. Without it there is nothing.

greg

Very nice Zach! I really like the fact that you didn't over engineer it. Last week I almost threw away the one I started a number of years ago because I still haven't finished it. I tried to make it too complicated. Yours is just right!

danielmatthews

That UI is really slick, especially the graph-view.

AdamIannazzone

Awesome project and video, thanks Zach!

BeckyStern

Very cool indeed. Probably gonna make this! THANKS

AmateurRadio-PW

Heat sink is usually required on the SSR when switching larger loads. See the device data sheet and read the nameplate on the appliance being switched.

I'd rather gut the controls from the oven completely and just wire directly so that the over can't be used for food..

But keep the controller outside the oven enclosure where it's cooler. Mount to the outside with a hole for an inverted U duct with a pwm fan for the cooling profile.

BerndFelsche

That kind of oven heats very unevenly though, whenever I bake something in it the middle parts get much more browning than the borders due to higher IR exposure. Using this for reflow you might either get cold joints in the edges or overstress components near the middle. Also you should consider that the thermocouple might not accurately measure the temperature the PCB will be in since the board will be receiving direct IR radiation in a large area, and the thermocouple has a very small area footprint. A larger convection oven or one with multiple, spread out heating elements would be much more adequate for this, and I'd maybe using a plate head thermocouple in order for it to receive more IR so you get more accurate readings

smlgd

2:05 I'm pretty sure that plastic bit is there as a standoff, so you don't casually pack the oven in too tight with other stuff and start a fire.

Change my mind. :P
(edit: of course someone else got there first, so . . . for the algorithm? then?)

Roonasaur

I would add a vertical moving axis on the plot to know the current time of progress

slabua

Perhaps that knob is to prevent the hot back of the oven touching the wall behind?

robmurg

The files in github are missing the wiring diagram, good work, i appreciate it 😊

MrMaxyMahdia

PID measures and produces an analog input/output. Therefore the light would not turn on and off but would dim and brighten. My guess is that your using some modification of on-off control which is traditionally used for controlling thermal systems.

JEFFREYDOHNER

What "code" did you use to "rotate" the resistive touch panel so it matches up with the buttons? I put you code in my Mega and the resistive touch (per the parts supply list), but the touch coordinates are not "rotated" with the screen. The touch is un-movable and x/y is in the portrait position, but the graphics (buttons etc.) are in land scape. Could you post your code that you used to fix this?

gsha