Help me with my Reflow Toster Oven Project

by **franklin97355** » Fri Oct 29, 2010 10:34 am

That chip to the right of c4 looks like it didn't get quite hot enough. The solder flowed but didn't wet the chip well.

by **mikeselectricstuff** » Fri Oct 29, 2010 7:08 pm

Parts will self-align much better with stencilled paste, as the paste covers the whole pad.
With dispensed blobs of paste, uncovered parts of the pad may start oxidising before the flux in the paste gets to it, so it doesn't wet fully.

Website · by **Hamradio2008** » Fri Nov 05, 2010 10:09 pm

Some closeup pictures for your comments and interest. Here are some recent wiring additions to add push button controls (start and stop initiation), led indications (preheat, soak, reflow, cool) and Thermocouple input. Using a CAT5 jack for connection to human interface control board (buttons and leds).

: Reflow.Controller.wiring.closeup.1a.jpg (194.07 KiB) Viewed 1701 times

lower right corner is LM7805 attached to enclosure feeds arduino power and power to control box led indication, walwart for 12v relay power

: Reflow.Controller.wiring.closeup.2a.jpg (183.92 KiB) Viewed 1701 times

Adafruit T/C board standing on end so as not to obstruct other digital I/O points. Relays in foreground.

: Reflow.Controller.wiring.closeup.3a.jpg (194.35 KiB) Viewed 1701 times

Cat5 cable for connection to external pushbutton and led indication control board. Ribbon cable for connection to relay board under Arduino.UNO are 4n35 optocouplers for relay interface.