10F222 ADC Problem

[Tobias]

I guess I need to rephrase the problem. The TPS values are incorrect when the 10F222 is attached to the output of the TPS. The TPS values really don't change much at all when attached, look at the TPS values when not attached. It varies appr 1.8 volts without the PIC attached to calculate the analogue level.

[mister_e]

I don't have a clue how TPS are made, but i have this feeling that you may need a buffer between the PIC and the sensor...

[skimask]

I don't have a clue how TPS are made, but i have this feeling that you may need a buffer between the PIC and the sensor...

Usually, a TPS is just a pickup from a pot referenced to +5v/Gnd...usually...unless he's picking off the wrong wire (the 'top' of the pot if the phrase fits).

[mister_e]

missed that ADCON line rusty you said

[skimask]

I guess I need to rephrase the problem. The TPS values are incorrect when the 10F222 is attached to the output of the TPS. The TPS values really don't change much at all when attached, look at the TPS values when not attached. It varies appr 1.8 volts without the PIC attached to calculate the analogue level.

You've got GPIO.0 set as a digital pin, and an output, and set logic low, so it's dragging down the TPS line.
Try configuring the pin correctly for what you are trying to do...
And since the ADC on the 10F222 is an 8bit result, there's no need for throttle to be a word.
BUT...since you're also DEFINE'ing ADC_xxxxx, this might be overriding everything you've just set up wrong.

[Tobias]

Thanks, that fixed the problem.

You've got GPIO.0 set as a digital pin, and an output, and set logic low, so it's dragging down the TPS line.
Try configuring the pin correctly for what you are trying to do...
And since the ADC on the 10F222 is an 8bit result, there's no need for throttle to be a word.
BUT...since you're also DEFINE'ing ADC_xxxxx, this might be overriding everything you've just set up wrong.