Transistorman
Member
anyone know a simple way ?
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anyone know a simple way ?
im trying to make keypad using only one analog porthi TT,
This question is very ambiguous, what do you mean....![]()
here is the schematic
**broken link removed**
hi TT,
What do you think the voltage will be on pin 7 when you press either switch.????????
i dont knowhi TT,
What do you think the voltage will be on pin 7 when you press either switch.????????
i dont know
So a little test for you, what do you think the current thru the 1K is if the adc input is say 1megohm.....???????
sorry , wrong pickNot 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.
And it's a LOT higher than that.
i dont understandhi 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.....???????
i dont understand
so there is a way to calculate analog input ?
ok , i will take a lookLook up 'potential divider'.