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Inspired by a video on LinkedIn: https://www.linkedin.com/posts/interestingengineering_diy-money-saver-using-arduino-ugcPost-6778642933374586880-2k7G/ **Bill of Material:** - 1 x Arduino Nano: https://de.aliexpress.com/item/32267271986.html - 1 x Extension Board: https://de.aliexpress.com/item/32933662259.html - 1 x Servo: https://de.aliexpress.com/item/1005002485404471.html - 1 x Mini USB-Kabel 0.3m: https://de.aliexpress.com/item/32918461237.html *Variant with Battery* - 1 x Batteryholder 4 AA: https://de.aliexpress.com/item/32818907820.html - 1 x Switch MTS-101: https://de.aliexpress.com/item/33012530737.html - 4 x AA Battery... *Variant with Accumulator* - 1 x USB Powerbank… *General Stuff:* - Two core wire… - 10 kΩ Resistor: https://de.aliexpress.com/item/33013181098.html - Copper Tape: https://de.aliexpress.com/item/33047300537.html **Assembly** 1. Cut box with a Lasercutter (use SVG) 2. Fold and glue the parts 3. Attach the servo to the lid with a glue gun (make sure it is well placed) and 4. Solder the wires to the Nano 5. Attach the copper tape to the lever 6. "Connect" each copper area with one wire (so it acts as a switch) and solder it to the Nano. 7. Solder wires to the switch 8. Connect the battery via switch to the Nano (to save power) **Arduino Script and Wiring** Script, wiring and simulation for Uno and Nano: https://www.tinkercad.com/things/kTMsd98OjVl *Make sure you select the correct Board:* https://www.instructables.com/Arduino-Nano-USB-Not-Recognizing-Fix/ **More** - Images: https://photos.app.goo.gl/CcD6KL7wpT6TgmU89 - Basic Arduino Script: https://www.tinkercad.com/things/cO0QsEEKBYH