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Hardware Issue

 
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Sid2286



Joined: 12 Aug 2010
Posts: 119

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Hardware Issue
PostPosted: Wed Oct 27, 2010 4:40 am     Reply with quote

Hi,

I have 5 seven segments connected where i'm displaying the analog inputs.
the circuit works fine on ICD2.

however, when I'm placing it on breadboard, m getting display but its all fluctuating. It is not at all constant :(

Please help me

Regards,
Sid
temtronic



Joined: 01 Jul 2010
Posts: 9255
Location: Greensville,Ontario

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PostPosted: Wed Oct 27, 2010 5:02 am     Reply with quote

Without schematic or code it's hard to tell but first guess is power supply capacity. I would suggest a minimum of 2 amps at a rock stable 5 volts,with appropriate bypass caps both on the supply and near the PIC on the breadboard.
Ttelmah



Joined: 11 Mar 2010
Posts: 19568

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PostPosted: Wed Oct 27, 2010 5:13 am     Reply with quote

Other thing - grounds.
The ICD, will give you a nice solid ground and will be connecting back to the PC ground. 'Breadboard', won't.
Make sure you don't have 'daisy chained' grounds with analog circuitry connecting along a ground path where currents for the displays are being drawn.

Best Wishes
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