Starting off as a hobbyist or even small tech company designing and building electronics you will soon learn that most of the fun IC or MCU chips are either cheaper in, or only available in, surface mount form, and fancy reflow ovens are expensive. But a soldering oven isn't much different from a toaster oven-- the only difference is the accuracy and temperature settings.
That is why I'm going to show you how to build your very own Soldering Reflow Oven for under $100 from an old/new standard toaster oven, thermocouple and a microcontroller.
Note: This project can be accomplished many different ways with many different MCU's and components. I wanted to use Freescale Processors and StickOS BASIC, but I look forward to see how other people do this.
Step 1: What You need: BOM and Tools
-Basic Knowledge of AC wiring (eg: Black = hot, White = Neutral, Green = GND)
-Some Microcontroller experience
Bill Of Materials:
-Toaster oven new or old
-Fiberglass insulation or fiberglass pipewrap
- K Type Thermocouple
- Max6675 K Type Thermocouple to-Digital Converter
- SSRD-240D40R Solid State Relay (Mechanical ones will be too noisy), 40A
- Note: This relay is now obsolete but I had it lying around so I used it. You can use any SSR-- just make sure it is rated for double the current that you need, as it will be derated due to high temperature. If you're not sure how much current your toaster uses, calculate it from (Power = Voltage * Amperage). For example my toaster was 1500W at 120V, therefore I = 1500/120 = 12.5A
-All Round steel strapping
-16X4 Character LCD - White on Blue
-5 button joystick
-Screws and nuts and standoffs
-Acrylic face plate
-Protoboard or prototyping card
-Dip to SO breakout board
-Fume extractor (Optional)
-Laser cutter (optional)
-heat-shrink / marrettes