Hi all,

I have a project envolving a 12F675 pic reading a LM35 sensor.
The problem is that i'm using 5V as power and it's too much for the ADC resolution.

Also, i dont have any pin left that i can use for a lower voltage input for vref.

I have as inputs:
One pin for the sensor and one for a button
For outputs i have one pin for 2 leds and one for the serial out.

Also have 2 extra for the external eeprom data ( SCL and SDA ).

Is there a way i can get a better resolution with this setup or do i need more pins ?

The only thing i thought of was to lower the source power to 3V using a voltage divider after the 5V regulator and try to power all ( pic + leds + eeprom ) with 3V.

EDIT: I'm guessing that this way it will not work because it will not have the 5v needed to serial out the data to rs232
.