DS1820 resolution

[Darrel Taylor]

You can change the resolution of the DS18B20, but not the older DS1820.

And yup, it goes much faster.
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[RFsolution]

Sorry Darrel I mean 18B20

Any code example on how to do this ?

[Darrel Taylor]

I do.

Do you feel like beta testing something?
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[Darrel Taylor]

Ok, we'll go the easy way then.

Assuming you're not using the alarms ...

DS18B20_9bit  CON %00011111 ; 93.75ms, 0.5°C
DS18B20_10bit CON %00111111 ; 187.5ms, 0.25°C  <-- My favorite
DS18B20_11bit CON %01011111 ; 375ms,   0.125°C
DS18B20_12bit CON %01111111 ; 750ms,   0.0625°C  (default)

OWOUT DQ, 1, [$CC, $4E, 0, 0, DS18B20_10bit]

HTH,

[RFsolution]

Thanks Darrel

Would it be possible to share your 9/10bit conversion routine to degrees centigrade
? Walter

[Darrel Taylor]

The conversion is the same, no matter which resolution you use.

At lower res, the least signifcant bit's become 0's.
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[RichG]

Using the resolution setting would it be possible to make the 18S20 and the 18B20 interchangeable with the same software? I have tried setting the 18B20 to 9 bit and get readings using my 18S20 programming but get some very high temp readings.