Using DS18S20 vs DS1820 with 4x7 LED Displays

[sayzer]

Hi there,

Since DS1820 temp chips are replaced by DS18S20, we get a slower convertion time.
500ms vs. 750ms.

When using 18S20 (or 18B20), I get a blank on LED display while the convertion is in progress while I get no blank display using 1820.

Any idea how to overcome this issue?

[Darrel Taylor]

Been awhile, but if I remember correctly, you can send a "Start Conversion", then just check the busy flag on each loop. When it's done, goto a subroutine to get the result.

Most examples that I've seen just sit in a WHILE/WEND or similar loop waiting for the busy flag without doing anything else. 3/4 of a second is a long time.
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[DynamoBen]

Been awhile, but if I remember correctly, you can send a "Start Conversion", then just check the busy flag on each loop. When it's done, goto a subroutine to get the result.

Most examples that I've seen just sit in a WHILE/WEND or similar loop waiting for the busy flag without doing anything else. 3/4 of a second is a long time.
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I use a timer to send the start conversion every second. Then I check the flag via a loop, based on the flags status I either retrieve the info and update my display or continue on with other things. While/Wend wastes too much time for me.

[sayzer]

Thanks for the info DT.

Let me work on that bit.

[Darrel Taylor]

sayzer,

Are you using Bruce's code with the SLED4C, or independant 4 digit seven segment displays.

I was just thinking that if it's the SLED4C, it might be a different problem. Don't know what, but it wouldn't blank no matter how long it took for the conversion.

Just curious.
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[sayzer]

...Are you using Bruce's code with the SLED4C, or independant 4 digit seven segment displays...

Thanks DT.

I am using Bruce's code with independent 4-digit Seven segment displays (two displays; 8 digit).