DS1820 resolution

[RFsolution]

Hi

If I understand well it should be possible to lower the resolution of the DS1820
in order to speed-up the conversion time ?

As I want to use several DS1820's and return there value on a HSERIN request
this migh be a possibility

Further I dont need more than 1 or 0.5 deg resolution

Any one succeed in changing the resolution ?

Walter

[Darrel Taylor]

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

And yup, it goes much faster.
<br>

[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?
<br>

[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