Weight Scale

You can easily buy a very cheap scale gauge from the well known Chinese suppliers. This includes not only the strain gauge mounted on a aluminum block but also a 24Bit ADC HX711. There are several version available covering different weight ranges.

This projects uses a sensor able to be loaded with 5kg.

Combined with a Arduino Nano, a couple of switches, lithiumbattery ( harvested from an old laptop battery pack), charging and protection circuit based on TP4066, a boost converter (LiPo voltage -> 5V) and finally an OLED builds the complete weight scale.

Salvaging a few pieces of wood, printed a case for the electronic and you're done!

Software does allow a display resolution of 1g (which is pretty accurate) in large letters or counting feature so you can e.g. count the numbers of screws. A tara-button of course is also mandatory