1 simple adc test returns ad=-1

JWT

I've been looking over the 1 simple adc test for a week and can't figure out why I'm getting ad=-1 returned.

I've downloaded the code from the website a couple times just to be sure that I'm not getting an old copy or something like that. I've looked over the forums and not seen anyone else getting this issue.

Is there a jumper on the Propeller activity board WX that I'm missing?

I haven't modified the code in any way and it doesn't work. I've used the 3 channel example and still get the wrong results.

Any insight would be helpful

twm47099

Please post your actual code (click the C button above the editing pane and paste it between the [ code][ /code] markers.
Also show or describe your connections.

Tom

Hal Albach

In this link the 1 Simple ADC Test ( in Spin) is written for the Propeller Board of Education, not the Activity board.
https://learn.parallax.com/tutorials/language/spin/get-started-propeller-board-education/5-measure-voltage/simple-analog

In the previous page is shown how to add the potentiometer, maybe that may help.

JWT

sometimes you get your head too close to the problem.

put this one up on the board as the dumb question of the day

JWT

So what is the chip on the Activity board, Is it a different address? Looking at the chip I can't match the numbers to a datasheet?

kwinn

It's an ADC124S021. Online tutorials are at: learn.parallax.com/PropellerAB