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Digital Weight Scale

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This circuit employs a potentiometer as the weight sensing element. An object placed upon the scale displaces the potentiometer wiper, an amount proportional to its weight. Conversion of the wiper voltage to digital information is performed, decoded, and interfaced to the numeric display.


Parts List:
Component: Value: Datasheet: Qty:
Resistor

1K

Not Available 05
Resistor

2K

Not Available 01
Resistor

220

Not Available 08
Resistor 7.5K Not Available 01
Resistor 390 Not Available 01
Resistor 100K Not Available 02
Resistor 3M Not Available 01
Resistor 22M Not Available 01
Resistor 910K Not Available 01
Resistor 8M Not Available 01
Resistor 100K Pot Not Available 01
Capacitor 0.1uF Not Available 01
Capacitor 1uF Not Available 01
Capacitor 250pF Not Available 01
Capacitor 10uF Not Available 02
Capacitor 0.47uF Not Available 01
Capacitor 1uF Not Available 03
Regulator LM340 Available 01
IC DS8976 Not Available 01
Display NSB7881 Not Available 01
IC ADD3701 Not Available 01
IC MM74C02 Available 01