Table 1

Bill of materials

QuantityComponent nameWebsitePrice (United States)
1Adafruit Metro Mini 328 https://www.adafruit.com/product/2590 12.50
1Keyestudio 1602 LCD IIC/I2C/TWI Display 16x2 https://www.amazon.com/Keyestudio-Display-Module-Arduino-raspberry/dp/B01799UUGS/ 7.99
1IR Break Beam Sensor - 3mm https://www.adafruit.com/product/2167 1.95
15V MicroUSB Power Supply https://www.amazon.com/Travel-Charger-Adapter-Samsung-Galaxy/dp/B0117O020U/ref=sr_1_3?keywords=5v+micro+usb+power+supply&qid=1580226650&sr=8-3 6.79
1Adafruit Perma-Proto Breadboard https://www.adafruit.com/product/1606 6.95
1Jumper Wires https://www.adafruit.com/product/1957 1.95
1Threaded Steel Rod - 0.5” diameter, 12” length https://www.homedepot.ca/product/paulin-1-2-13x12-inch-thread-rod-plated-/1000797593 1.64
110 kΩ resistor https://www.adafruit.com/product/2784 0.75
1MicroSD Card Adaptor https://www.amazon.com/HiLetgo-Adater-Interface-Conversion-Arduino/dp/B07BJ2P6X6/ref=sr_1_2?keywords=sd+card+arduino&qid=1580155120&s=electronics&sr=1-2 6.99
40.5” Nuts https://www.homedepot.ca/product/paulin-1-2-13-fin-hex-nuts-gr2-unc/1000123145 1.30
1Push Button https://www.adafruit.com/product/1119 2.50
1PLA Filament (2/3 roll) https://www.amazon.com/Printer-Filament-SUNLU-Dimensional-Accuracy/dp/B07XG3RM58/ref=sr_1_6?keywords=pla+filament&qid=1580155473&sr=8-6 17.99(2/3 = 11.99)
1Additional wire https://www.homedepot.ca/product/southwire-simpull-t90-copper-electrical-wire-14-solid-blue-300m/1000150577 0.42
  • Total cost = $63.72.