Announcement

Collapse
No announcement yet.

Coffee Roaster Modifications to Air Popper

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • #16
    I did some experiments with a thermocouple in the beans and a PID controller which ends up cycling power on for 4 seconds and off for about 6 seconds, so being lazy decided the temp control is not that important so long as it does not go crazy at the beginning. Found that with PID control with no ramp I still needed to bring the temperature up in a few stages anyway.
    So with all that in mind I made a little triac controller with a PIC10F220 that simply turns the power on for 4 seconds, off for 6. I can add temp control etc later or a cutoff timer but for my needs suspect it is not required.
    Takes around 9:30 for a medium roast and 12:30 before second crack.

    Comment


    • #17
      Both of you have done great work that is beyond my skills. Awesome jobs!
      Who would have thought a pid popper....

      I did find some small hard drive transformers. Good for 2a at each of 5v and 12v. Pretty handy to run 5v sensors, and 12v computer fans...they were on ebay for few dollars.

      Comment


      • #18
        After reading the 2008 thread, i see this has been going on for some time.
        I might have to get one of these poppers yet.
        Inspiring stuff!

        Comment


        • #19
          Thermocouples arrived today so made a logging device that dumps the data to an MQTT server every 5 seconds, then pulled the data and plotted it. time scale in minutes
          This was my first test run with the 4 seconds on, 6 seconds off technique on the el cheapo target popper and it seems quite reasonable from a quick web search.
          Attached Files

          Comment

          Working...
          X