This project is an electronic digital tape measure (rolling ruler) without using microcontroller.
It using for length measurement.
You can order this PCB from here:
Parts List:
IC 40110 (4pcs)
IC 4093
IR LED
IR Receiver diode
7-segment display single digit common cathode (4pcs)
Battery holder for CR2032 (2pcs)
Battery CR2032 (2pcs)
IC Socket 16 pin (4pcs)
IC Socket 14 pin
LED
Dip switch
Push bottom
Capacitor 100uF (2pcs)
Resistors 2K (29pcs)
Resistors 1.5K (2pcs)
Resistors 20K
Resistors 2.7K
Resistors 10K
Circuit diagram:
3D Printed part:
You can download the 3D printer file from here :
Wheel with single hole: https://www.tinkercad.com/things/8G6yZZ7lcEU-digital-ruler
Wheel with 10 holes: https://www.tinkercad.com/things/hR8L8n9doIU-digital-ruler-2
Video:
