12f675

martynwalden1 · Post by **martynwalden1** » Fri Jun 10, 2011 3:58 pm

Can any one help with this one? The chip will not accept inputs from GP0 and GP1. Iam using the internal clock and internal MCLR.
The program works perfectly on the simulator but wont work in circuit, the outputs work has they should. I have tried different ways
of input configarations but to no avail.

Post by **Benj** » Fri Jun 10, 2011 5:25 pm

Hello,

Are you leaving the input pins floating at any point? If you are then you will get unpredictable results at best. Look at the schematic in the datasheet for our EB007 board and ensure you are using similar circuitry. This basically pulls the pin to ground when the switch is not pressed and pulls the pin to +V when the switch is pressed.

martynwalden1 · Post by **martynwalden1** » Mon Jun 13, 2011 9:24 am

Hi Ben, the inputs are tied to VSS by 100K pull down resistors.

Post by **Benj** » Tue Jun 14, 2011 10:32 am

Do you have a multimeter or similar you can use to confirm the input voltages are present on the pins?

Post by **medelec35** » Tue Jun 14, 2011 10:55 am

Also it may be a good idea to check chip is configured correctly to run by toggling an output every 500ms to produce a 1Hz flasher.
This may help you:
http://www.matrixmultimedia.com/mmforum ... =26&t=6936
If you are still stuck and would like to post your flowchart, I can take a look at it for you.

Martin

Matrix user forums

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