Ben's Home-Brew Solder Reflow Oven 2.0 Episode -- Episode 116

http://www.element14.com/community/community/experts/benheck/blog/2014/01/17/episode-116-project-files

http://www.element14.com/community/community/experts/benheck/blog/2014/01/17/episode-116-project-files

For anyone building at home and modifying the profiles

int profiles = 0;

 

 

int profile[4][6] = {

  {

    75,140,45,125,205,20                                    }

  ,

  {

    75,140,45,125,205,20                                    }

  ,

  {

    75,140,45,125,205,20                                    }

  ,

  {

    75,140,45,125,205,20                                    }

};

 

 

String profileNames[4] = {

  "Ol' Fashioned Pb", "New Fangled RoHS", "Profile 3       ", "Profile 4       "

};

the format of the profiles is {Ramp 1 0-255, 1st target temp, hold seconds at 1st target, Ramp 2, 2nd target temp, hold seconds at 2nd target} 

Ramp rate is kind of a misnomer, its just the analog write value but because our relay is a zero cross and we aren't accounting for the cross, it doesn't exactly work as good as a PWM value would.

The ROHS profile definitely needs changing, probably a 220 target.  Your results may vary but you will definitely have to tweak for your own oven and possibly it could change depending on your board as well.

Hi,

I'm new at this but i love to learn new stuff.....I would like to make this, but beside just copying your thing, i'd like to add network access and a web server where i could set the values, and monitor progress...(timer, current temp, etc...)

What are the limits of the SPI ?

will i run into a problem if i grab a tft touch screen, ethernet shield, wifi shield, and those two sensors?

if yes, is there some way to avoid it? other MCU? 1-way type sensors?

what are the memory restrictions? i'd like to avoid SD cards if possible.

thank you

I believe the SPI I was using for those sensors was bit-banged, so it was kind of slow.  I wouldn't recommend putting all of those things on a SPI bus with an Arduino.  The Arduino is a pretty limited device.

Maybe look into using a Raspberry Pi instead, they have a TFT touch screen that fits on it, it already has ethernet, and there are a lot of tutorials on SPI sensors and I/O control with it.

Well, I have a RasPi but I really don't want to use an SD card, as they've proven unreliable (except for the most expensive ones). I would like to put it into an enclosure and have it in fire and forget manner, once I've done everything I need on it. Most likely I'll not be the only one using it, moving it around, loaning it to friends, etc. and I want to minimise the risk of anything going awry. RasPi without SD card would be the single solution to my problem... Is there such a thing?

I would require ethernet shield only to configure wireless connection (or something like that, don't have that concept worked out in my head yet.) I don't want to reprogram arduino everytime a friend asks me to lend him the oven so he can connect to his own wireless.

One of the ideas I came across is connecting arduino via serial port to TL-WR703N wireless router

One is using Spark and cloud.

and so on...

I don't know...Its been occupying my mind for a week now, making me losing sleep because of all the possibilities

I'm lost...

Hi,

If I understand this correctly the profile is broken into triplets (ie PWM,Temp, Sec to hold @ temp) and that repeats. So looking at this there it ramps twice but my question if my assumptions are correct is can you add another triplet on to the profile (ie preheat triplet, soak triplet, reflow triplet)?

Thank you.

It's been awhile but I don't think the code is set up that way, its set to ramp to a first setpoint, the soak, then ramp to the reflow temp, it holds, then turns off.  You could modify the code to allow a third setpoint yourself though.

Is there any kind of schematic and parts list for the build ???