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Thread: Pimped Silvia (PID + Timer + Water)

  1. #1
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    Pimped Silvia (PID + Timer + Water)

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Thought I'd share a project I've been wanting to work on for a while.

    I've had my Silvia for about a year, and PID'd externally for most of it.

    I've finally got around to:
    - Adding boiler insulation
    - Mounting the PID internally
    - Adding a shot timer
    - Adding a water light controlled via a float switch

    The PID is obviously easy to do, however it is only a single setpoint so I don't have steam control. I tried, but failed to set that up. I'll have to upgrade my PID I think.

    There is a reset button for the timer next to the brew switch as I couldn't work out how to wire it up correctly to have it reset automatically. The LED timer remembers where it was at, which in this case is a bit of a pain. So I flick the brew switch, the timer starts, and hit the reset button straight away. Hooked up via a 240 to 12v transformer.

    The green LED is run through a float switch in the tank. It goes out when there isn't much water left in the tank. I think I might reverse this, as the light is pretty bright. It's also hooked up via a 240 to 12v transformer.





    Thanks for looking!
    smokey likes this.

  2. #2
    Senior Member artman's Avatar
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    Very cool and looking nice and pimped!

    Do you have any further info on how you mounted the float switch?

    Cheers

  3. #3
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    The float switch is mounted through the base if the tank. It's a pretty small shaft so the light turns off when there is less than 2 inches of water left in the tank.

    So it's now a permanent fixture because there's a hole in the bottom of the tank!

    Also made it so the wires can be detached for removal/cleaning.

  4. #4
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    Really professional job...Well done

  5. #5
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    Bowds, thanks for the post, all though its been a while I are just about to take the plunge myself with the same controller.

    just a couple of observations/questions,

    for your shot timer I think you would need to use a on-delay timer and then run the pump off the B contact from the common. this way switching the brew switch on would power the timers coil immediately energising the pump via the b contact in the rest position until the set time elapsed therefore activating the contact and breaking the B contact. turning the switch back off would therefore reset the timer.

    Is the lower LED readout the timer value or a digital pressure/temp readout?

    I intend to make my implementation 100% reversible so I will be mounting the controller in some ally rectangular hollow section in the popular position under the steam valve and may later on use a weightometer (spring and limit switch ) under the tank or a reed switch to detect water low. just haven't figured out where to mount indicator for that.

    anyway you posted a couple of times about your PID settings and i was just wondering if you had experimented further with them.

    cheers.
    Last edited by koshari; 8th September 2014 at 08:07 PM. Reason: typos



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