Reading analog input

Transistorman said:

anyone know a simple way ?

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Transistorman said:

anyone know a simple way ?

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ericgibbs said:

hi TT,
This question is very ambiguous, what do you mean....

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Transistorman said:

here is the schematic

**broken link removed**

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ericgibbs said:

hi TT,
What do you think the voltage will be on pin 7 when you press either switch.????????

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ericgibbs said:

hi TT,
What do you think the voltage will be on pin 7 when you press either switch.????????

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Transistorman said:

i dont know

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ericgibbs said:

So a little test for you, what do you think the current thru the 1K is if the adc input is say 1megohm.....???????

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Nigel Goodwin said:

Not to mention that the 12F629 doesn't have an ADC

If he wants to use the 12F629?, then he could checkout my joystick tutorial, which would allow him to do what he wants.

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Nigel Goodwin said:

And it's a LOT higher than that.

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ericgibbs said:

hi TT,
Use Ohms law.
The input resistance of the analog is VERY high compared to the 1K and 10K resistors.

Current = Voltage/Resistance..... the resistance is the sum of the 1K or 10K with very input resistance..........

So a little test for you, what do you think the current thru the 1K is if the adc input is say 1megohm.....???????

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Transistorman said:

i dont understand

so there is a way to calculate analog input ?

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Nigel Goodwin said:

Look up 'potential divider'.

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