USED REFLOW OVENS CODE

This is the quicky вЂovenвЂ™ of choice for folks like Sparkfun. AlternativesД«efore getting into the hot plate, a short discussion of alternatives. Melting temperature must be exceeded by approximately 20 вЊ to ensure quality reflow. Solder reflow is accomplished in the reflow zone, where the solder paste is elevated to a temperature greater than the melting solder point. The dryout section is used primarily to ensure that the solder paste is fully dried before hitting reflow temperatures. The most critical point in the preheat section is to minimize the temperature rise rate to less than 2 вЊ/second, in order to minimize thermal shock on the semiconductor components. Reflow curves showing safe ranges and results of bad curvesДЄ typical profile consists of a preheat, dryout and reflow sections. Below is a generic reflow temperature curve (courtesy STMicroElectronics): The temperature across the circuit board should be uniform during the phases.The oven must accurately follow the right temperature curve for reflow.GoalsДЄ good reflow oven is distinguished by only two characteristics. ThereвЂ™s a startup issue so itвЂ™s kind of kludgy but it works reliably.

USED REFLOW OVENS CODE

The source code for the hot plate is here. I ended up with a simple unit made up of a Raspberry Pi controller that used two easy to obtain heating cartridges and the results are outstanding.

This is a pretty long article so the results are first. So, IвЂ™m building my own reflow hot plate from scratch.ДЄ reflow oven is a device for melting solder paste on a circuit board such that the paste smoothly melts and surface mount components self-align. I looked into buying a reflow oven but after reading reviews of inexpensive ovens - poor temperature regulation, bad interfaces, dangerous construction - and looking at alternatives (hot plates, toaster ovens, вЂ¦) I finally just decided that nothing had the necessary attributes. IвЂ™ve been building surface mount circuit boards by hand with a hot air gun.

Used reflow ovens