Reading a linear hall sensor

Hi Im using this schematic (PIC12F683):

http://peu.net/temp/hall1.gif

and this code to continuosly read the hall sensor.

It works fairly well, but I can't read the whole range of the ADC, I can't reach pwmstat values of 0,1 or 9 what am I doing wrong?

Just in case here is the hall sensor datasheet

Thanks in advance

1. It's a hall effect sensor
2. the output is open-collector, the resistor should be to Vdd
3. you need to read a frequency not a voltage
4. read #5 in the features section of the datasheet

Thanks for the prompt reply mister_e.

As you can see im not familiar at all with hall effect sensors :) weird thing about the code/schematics I posted is that it somewhat works

I will appreciate any hint on what to do, now that I see the sensor output is digital Im completely lost (pulsin comes to mind)

thanks!

Pulsin may work, Count too, an internal Timer too. I prefer internal timer in counter mode.

Oh BTW, if it was an analog out, you should disable the internal comparator -> CMCON0

ok timer or pulsin, either way, how do I know when to stop reading and start counting again?

Im reading another hall efect linear sensor datasheet: http://www.allegromicro.com/datafile/1301.pdf this one looks like more appropiate for my code, but it costs 5x the price of the one Im using :(

back to the HI300/D1, I don't understand how to read it from the datasheet, which by the way looks very brief.

Can you help me with some metacode on how to read this sensor?

thanks

Count PORTB.0,100,ByteVar
This will count the pulse on PORTB.0 during 100mSec

You should measure the frequency at the sensor output first.