help with readadc10

[jwsparkes]

Can you please help me with a problem. I am running a simple program that monitors a variable voltage and then outputs the result on the AXE033. The AXE033 works in this program (unlike that program to which I have recently describe - still having issue with that)

For some reason, the readadc10 alway returns zero regardless of the voltage on the readadc pin. I have the -08M connected to a 5V supply and a seperate 15V supply as the variable voltage.

I have attached the code and the VSM model for your reference.

I have read the previous post regarding readadc on seperate rails and I don't think this is the same issue.

Please help.

regards James.

 

[Technical]

You have mixed up your power supplies. You have a power node marked '5V' connected to the PICAXE power pin Vdd, but have not defined '5V' via Design>Configure Power Rails menu.

To fix:
Delete the connection between the PICAXE power pin and the undefined 5V node.
Right click Place>Terminal>Power
Connect this default power node to the PICAXE power pin.

The simulation then works as expected.

Or alternately define '5V' via the menu.

 

[jwsparkes]

thanks tech, that solved the problem. strangely though, the alt method did not work. whenever, I add a label to the power line and configure it to be linked to Vcc, the simulator fails. I had to add a text note adjacent to the power line to remind me that it's 5V.

regards James.