vinctal
Newbie level 4
Hi ,
I've been trying to figure an easy circuit for battery's voltage measurement, then translating that voltage to an input 0-5v that could be read by a PIC18F4550 microcontroller.
My idea is to have the voltage from the battery divided, so that the voltge would come out to be less that 5V. After the voltage is divided, it will goes to the anlog input of the PIC18F4550..
Here's part of the schematic that I'm working on to give some visualization:
1) As I go through the datasheet of PIC18F4550, at section 22.9 Analog Input Connection Considerations it mention that "A maximum source impedance of 10 kΩ is recommended for the analog sources". What does it mean ? Anyone can help to explain ?
2) what's the input impedance of the analog input of PIC
3) I am using voltage divider.Would this be a good circuit for sensing battery voltage? Could I make any improvements ?
Thank you very much !
Best Regards
I've been trying to figure an easy circuit for battery's voltage measurement, then translating that voltage to an input 0-5v that could be read by a PIC18F4550 microcontroller.
My idea is to have the voltage from the battery divided, so that the voltge would come out to be less that 5V. After the voltage is divided, it will goes to the anlog input of the PIC18F4550..
Here's part of the schematic that I'm working on to give some visualization:
1) As I go through the datasheet of PIC18F4550, at section 22.9 Analog Input Connection Considerations it mention that "A maximum source impedance of 10 kΩ is recommended for the analog sources". What does it mean ? Anyone can help to explain ?
2) what's the input impedance of the analog input of PIC
3) I am using voltage divider.Would this be a good circuit for sensing battery voltage? Could I make any improvements ?
Thank you very much !
Best Regards