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test Zotino DAC temperature stabilization #57

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opened 3 years ago by sb10q · 5 comments
sb10q commented 3 years ago
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topquark12 was assigned by sb10q 3 years ago
sb10q commented 3 years ago
Poster
Owner

I have ordered the required IDC cable. got bitten by https://github.com/sinara-hw/Zotino/issues/23

<s>I have ordered the required IDC cable.</s> got bitten by https://github.com/sinara-hw/Zotino/issues/23
sb10q commented 3 years ago
Poster
Owner

Pinout is compatible, so I suppose we can just remove the plastic projection in the middle of the cable's 10-pin IDC plug with a Dremel, and assemble it carefully into the 16-pin Zotino connector.

image
image

Pinout is compatible, so I suppose we can just remove the plastic projection in the middle of the cable's 10-pin IDC plug with a Dremel, and assemble it carefully into the 16-pin Zotino connector. ![image](/attachments/4d497af0-3de7-4a27-b1d4-a385691a9122) ![image](/attachments/609f0f05-af2d-44af-8fad-f1d6d823a87a)
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topquark12 commented 2 years ago
Owner

Ran a quick test using auto tuned PID parameters. The heat sink on the Zotino is quite small and saturates fast. Placing a tiny fan next to the heat sink, it can barely reach 15 deg C before the TEC can no longer cool.

Maintaining 20 deg C does not seem to be an issue and can reject heat disturbance from my finger. Anything else I should test?

Ran a quick test using auto tuned PID parameters. The heat sink on the Zotino is quite small and saturates fast. Placing a tiny fan next to the heat sink, it can barely reach 15 deg C before the TEC can no longer cool. Maintaining 20 deg C does not seem to be an issue and can reject heat disturbance from my finger. Anything else I should test?
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topquark12 commented 2 years ago
Owner

Tested the limits of the Zotino cooling. Even with very good airflow, the TEC can only reach 17.5 deg C with an ambient temperature of 27 deg C. Further lowering the temperature will require larger TEC and heatsink IMO.

Tested the limits of the Zotino cooling. Even with very good airflow, the TEC can only reach 17.5 deg C with an ambient temperature of 27 deg C. Further lowering the temperature will require larger TEC and heatsink IMO.
15 deg target.png
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IMG_20210604_095151.jpg
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topquark12 commented 2 years ago
Owner

Here's stability over a period of 5 minuites. Result looks reasonable given there's barely any insulation on the zotino.

Here's stability over a period of 5 minuites. Result looks reasonable given there's barely any insulation on the zotino.
zotino stability.png
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sb10q closed this issue 2 years ago
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Reference: M-Labs/thermostat#57
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