Otavio wrote:

>I'm developing a temperature controller with two sensors,
>I'm using a 16F877 and I'm almost finished, the only problem
>is the temperature sensor.
>- I though of using thermostat, but I will have to calibrate
>each unit.

Take a look at AN512 at Microchip.

>- I though of using Dallas DS1820 but they are expensive
>- I though of using Dallas DS1822, the price is ok the not
>the availability.

I use a termistor supplied by US Sensor. 10k curve J, $0.10 US each.
Take a look. www.ussensor.com
and I read it as a cap charge time.

Marcelo Y.
m_yamamoto@uol.com.br