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PostPosted: Mon Jul 02, 2007 1:51 pm 
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Superior Bird
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Location: Bendigo
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I have an incubator that has it's original wafer thermostat. I have designed a circuit as a direct wafer replacement using a simple microcontroller/sensor circuit. With the flick of a switch I can swap from the wafer controlling the temperature to the circuit controlling the temperature, which is of course what this graph shows. Both are averaging 37.5 degs here. Although the wafer took half a day of adjustment the micro circuit is just plug and play.


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PostPosted: Mon Jul 02, 2007 8:29 pm 
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Champion Bird
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Location: Reynella sa
Wow, 1/2 a degree swing, great stuff!!

Regards
Trev

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PostPosted: Tue Jul 03, 2007 12:52 am 
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Golden Robin
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I am very interested - any further info ???


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PostPosted: Tue Jul 03, 2007 3:00 am 
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Superior Bird
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Location: Bendigo
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Same graph again. The left of the red line is just the data in previous picture. The right of the red line I have simply opened the vents right up.

The yellow line that runs through the data is a moving average that Excel does, (Trend Line)

All temps are taken using my controller monitor which is placed as close to the wafer as possible. Normally I have the sensor on a light lead that sits right on the eggs.

It is interesting that the temperature at the wafer has drifted Upwards ... anyone got any ideas on that.


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PostPosted: Tue Jul 03, 2007 9:01 pm 
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Golden Robin
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Varying humidity ???


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PostPosted: Tue Jul 03, 2007 9:03 pm 
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Old Mother Goose
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gooblediegook to me.. 8)

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PostPosted: Tue Jul 03, 2007 9:20 pm 
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Champion Bird
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Location: Reynella sa
Hi Dennis
Is the bator fan forced? and where are the vents in relation to the wafer?
Could it be getting a cold area in the wafer zone due to the vents causing a false reading? Would it be possible to put the probe up near the wafer and monitor what is happening temp wise there?
Might be totally wrong but seems logical.
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Trev

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