Have you ever wondered if you have enough filament before starting a print job? This project shows how to build a meter and save the remaining amount so you always know if you have enough. This project uses an Arduino, an infrared pulse sensor, a ST7735 based display and some 3D printed parts.

This github link has drawings, code and STL files
https://github.com/KrisKasprzak/Fila-...

Parts list
Display
https://www.amazon.com/gp/product/B07...

Pulse (Speed) sensor
https://www.amazon.com/gp/product/B07...

NANO
https://www.amazon.com/gp/product/B09...

Buzzer
https://www.amazon.com/gp/product/B07...

Switch
https://www.amazon.com/gp/product/B01...

Bearing for feed counter
https://www.amazon.com/Winter-Evening...


Other useful tutorials
Temperature sensor shootout:    • Temperature sensor shootout  
Using 7-segment LED's:    • Using 7-segment display LED's  
Writing and reading to SD cards:    • Tutorial: Writing and reading to SD c...  
Saving settings even during MCU power down:    • Tutorial: How to save settings to MCU...  
Getting those darn TFT LCD displays to work:    • Tutorial: Getting TFT LCD displays wo...  
Turning stuff on or off:    • Tutorial: Use your MCU to turn stuff ...  
Writing analog signals/voltages:    • Tutorial: Use analogWrite to vary spe...  
Using digital sensors:    • Tutorial: Use digitalRead to monitor ...  
Using analog sensors:    • Tutorial: Use analogRead to monitor a...  
Talking to your Arduino:    • Tutorial: How to talk to your Arduino...  

Some fun projects to build
Homemade motorized table saw fence    • DIY motorized table saw fence  
High"er" res homemade Thermal Camera for $100:    • DIY high-er res Thermal Camera for $100  
DIY Garage Parking Assistant:    • DIY Garage  Parking Assistant