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Solder Reflow Oven Build

joe

I was watching the episode of Ben Heck's show here on element14 where he build a solder reflow oven out of a toaster oven and I thought this might make a nice project.  If you'd like to check out Ben's build, you can check out the link below:

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

 

I have started work on this project and will post additional details if I make any progress.  To get going, I have chosen the MSP430G2955 to be the controller and will be interfacing it with the EA DOGS102-6 102x64 dot matrix display. 

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  • For the breakout board, the MAX31855 requires a Type K thermocouple. 

    Here's a description from the manufacturer on the thermocouple that I am using:

    CHROMEGARegistered-ALOMEGARegistered (ANSI Symbol K) The CHROMEGARegistered-ALOMEGARegistered “K” curve thermocouple with a positive CHROMEGARegistered wire and a negative ALOMEGARegistered wire is recommended for use in clean oxidizing atmospheres, The operating range for this alloy is 2300°F for the largest wire sizes. Smaller wire sizes should operate in correspondingly lower temperatures.

     

    I chose a 20 gauge wire, so the max temperature will be considerably less than specified above.  The max range that I would expect to measure would be less than 350°C

     

    MAX31855 data packet is 32 bits in which the thermocouple temperature is reported in bits 18:31.  Bits 0:17 contain some fault checking capabilities and the internal chip reference temperature.  I have parsed out the packet to only obtain the thermocouple temperature.  The 14 bit binary number is converted to a Celsius result by assuming each bit is equal to 0.25°C.  For example, a result of 0000 0000 0000 10 is equal to 0.50°C.  Since the last two bits contain the decimal portion of the temperature result, it was a simple process of just shifting the bits two places to the right, and then the whole number portion of the results can be outputted as an integer.  Then I could look at the last two bits separately to determine the fractional portion.

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  • For the breakout board, the MAX31855 requires a Type K thermocouple. 

    Here's a description from the manufacturer on the thermocouple that I am using:

    CHROMEGARegistered-ALOMEGARegistered (ANSI Symbol K) The CHROMEGARegistered-ALOMEGARegistered “K” curve thermocouple with a positive CHROMEGARegistered wire and a negative ALOMEGARegistered wire is recommended for use in clean oxidizing atmospheres, The operating range for this alloy is 2300°F for the largest wire sizes. Smaller wire sizes should operate in correspondingly lower temperatures.

     

    I chose a 20 gauge wire, so the max temperature will be considerably less than specified above.  The max range that I would expect to measure would be less than 350°C

     

    MAX31855 data packet is 32 bits in which the thermocouple temperature is reported in bits 18:31.  Bits 0:17 contain some fault checking capabilities and the internal chip reference temperature.  I have parsed out the packet to only obtain the thermocouple temperature.  The 14 bit binary number is converted to a Celsius result by assuming each bit is equal to 0.25°C.  For example, a result of 0000 0000 0000 10 is equal to 0.50°C.  Since the last two bits contain the decimal portion of the temperature result, it was a simple process of just shifting the bits two places to the right, and then the whole number portion of the results can be outputted as an integer.  Then I could look at the last two bits separately to determine the fractional portion.

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