681 kohm 470 ohm
Vx ----/\/\/\---o-----/\/\/\----Pin to stamp
unknown |
voltage ===== 0.01 uF film
|
Vss
The source code for the basic stamp is:
' {$STAMP BS2}
' {$PBASIC 2.5}
' {$PORT COM1}
rct VAR Word ' RCtime value
Vx VAR Word ' voltage value calculated
Cn1 CON 48576 ' first constant, see below
Cn2 CON 8 ' second constant, ditto
' circuit attached to P15
LOW 15
start:
RCTIME 15,0,rct
LOW 15
Vx= Cn1 / rct + Cn2
DEBUG DEC ? rct,DEC ? vx
PAUSE 500
GOTO start
You will have to experiment with the constants and values. I had to sit with my battery and take readings while I worked on the robot, then as the battery drained I took readings and voltage measurements and made my self a look-up table.
