Solved - Tempmeter w/ LCD from Arduino Uno -> ATtiny84

Using Arduino Microcontrollers
#1

Hi.
I merged this code from some nice projects found on net:

I use DS18S20 with OneWire library. Everything works fine, when I use Arduino.

Then I tried to move the code to ATtiny84 (to spare Arduino). I had no problem using Arduino as ISP (as described here: High-Low Tech – Programming an ATtiny w/ Arduino 1.6 (or 1.0) or High-Low Tech – Arduino board as ATtiny programmer).

When I power ATtiny up, instead of real temperature, I get const "Temp.: -0.6" written on LCD.

Is there something wrong with pin assignment, since ATtiny doesn't read the temp sensor? In the first version of code I used ds.search() for sensor, but in version 2 I hardcoded the MAC of sensor into code, still the same problem. I also tried to connect sensor to other ATtiny pins, but that didn't help, too.

Fritzing breadboard with some explanation and notes is here:

Thanks and best regards
Robert

#2

Have you configured the t84 to run at 8 MHz?

#3

I put a blinking LED on D1 (pin 12 on ATtiny). It blinks when running from Arduino.
If I burn a bootloader with 8 MHz (or with 1 MHz), I get only full squares on LCD and LED is not blinking.

If I just upload the sketch to ATtiny with 1 MHz clock, it works the same as from Arduino.
If I just upload the sketch to ATtiny with 8 MHz clock, the LED is blinking 8 times slower.

#4

I give up. I have not been able to decipher your last post. Someone else will have to help you or you will have to make another attempt to describe your situation.

#5

Hi.
Sorry for mess …
I uploaded the sketch after I burnt bootloader and it works like a charm now. Thanks for a tip.
Best regards
Robert

#6