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Legacy Personal Blogs Arduino Hot Plate (3) - cooking with AC
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  • Author Author: wolfgangfriedrich
  • Date Created: 8 Nov 2020 1:23 PM Date Created
  • Views 377 views
  • Likes 6 likes
  • Comments 5 comments
  • jumper wire
  • ac
  • hot_plate
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Arduino Hot Plate (3) - cooking with AC

wolfgangfriedrich
wolfgangfriedrich
8 Nov 2020

Edit: Added initial test results.

 

After some tests with larger plates and Arduino sized PCBs it turned out that 100W USB-C power was not enough for my Hot Plate to get enough heat into the PCB to melt the solder reliably. It was more like a warming stage and I had to do the soldering with hot air, which went very well but was not desirable.

So I took all the MCHs and attached them to a good sizes plate (big enough to solder 2 Arduino shields at the same time) and wired them in series. The resulting resistance is 37 Ohm, which is resulting in 3.2A or a whooping 390W of heating power. AC is controlled by a solid state module and protected with an extra 15A circuit breaker.

Some pictures of the build and setup.

 

5 MCSs wired in series, the one with the highest resistance (2nd from the left) as much as possible in the center.

image

 

AC wiring with solid state module and 15A breaker.

image

 

Full setup

image

 

Now all that is left, is to test it. image I will report back soon with results.

 

And I powered the system up and got some interesting results. First, the thermal sensor is visible at the lower right corner as far away from the heating elements as possible.

Running a full profile without PCB on the plate got the sensor up to ~240degC, which seemed to be lower than expected. Another test run with a PCB and solder pieces (leaded and lead free) melted the leaded solder easily, but the lead free one barely got liquid and did not melt into a nice ball due to its surface tension.

To verify the performance I connected the AC business end through my trusted KILL-A-WATT power meter. And I got an unexpected surprise. The power started at ~300W as expected, but dropped with increasing temperature to only 120W at 200degC. I have to read up on thermal properties of those MCH elements.

The solution seems to be counter intuitive. I have to decrease the number of heating elements, to decrease the resistance and increase the current. Because of P=I*I*R this should give me more power. Let's find out.

To be continued....

 

 

 

And finally a little detail:

For the breadboard connections, I tried something new. I used 2-pin jumpers for a single connection to give them better retention force. The jumper pins are thinner than regular ones to not bend the breadbord inserts permanently. With 2 pins they hold better in place, they only have 2 minor drawbacks. First, you have plug them in with the correct orientation to not short the signal with a neigbouring one. And 2nd, they take up 2 spots of the row of 5 connected holes.

Jumper wires with 2-pin header:

image

 

Inserted jumper wire (Ground and one signal):

image

 

- W.

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Top Comments

  • genebren
    genebren over 2 years ago +2
    That is some serious power. I hope that this gets you the heat you are looking for. I like your clever solution for a more secure protoboard connection.
  • wolfgangfriedrich
    wolfgangfriedrich over 2 years ago in reply to genebren +2
    Thanks, genebren . The heat and power was less than expected. I updated the post with some results. Those heating elements have some unwanted thermal-resistive properties.
  • dubbie
    dubbie over 2 years ago +2
    Looks a challenging build. Too much for me I think. Maybe I could just buy one. I could tell the wife it could be used for baking cakes. I woner if it could? Dubbie
  • dubbie
    dubbie over 2 years ago in reply to wolfgangfriedrich

    Ummm - bacon.

     

    Dubbie

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  • wolfgangfriedrich
    wolfgangfriedrich over 2 years ago in reply to dubbie

    The build was a little bit of everything, electronics, mech and firmware. Now I just have to make it work....

    A cake would probably be too large, but I should try cookies or bacon strips. Would be a nice change of smell from the solder fumes. image

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  • dubbie
    dubbie over 2 years ago

    Looks a challenging build. Too much for me I think. Maybe I could just buy one. I could tell the wife it could be used for baking cakes. I woner if it could?

     

    Dubbie

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  • wolfgangfriedrich
    wolfgangfriedrich over 2 years ago in reply to genebren

    Thanks, genebren.

    The heat and power was less than expected. I updated the post with some results. Those heating elements have some unwanted thermal-resistive properties. image

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  • genebren
    genebren over 2 years ago

    That is some serious power.  I hope that this gets you the heat you are looking for.  I like your clever solution for a more secure protoboard connection.

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