Table 1.

List of all components that were used to fabricate the automated hand sanitizer dispenser.

Major Components	Manufacturer/Brand	Advantages	Price (USD)
R3 Board ATmega328P with USB Cable for Arduino-Compatible	Kuman	Inexpensive Cross-platform-runs on Windows, Macintosh OSX, and Linux operating systems while other microcontroller circuits only run on windows User-friendly programming environment	10.690
MCIGICM Photoresistor Photo Light Sensitive Resistor, Light Dependent Resistor 5 mm	MCIGICM	Light resistance (at 10 Lux): 5–10 Kohm which is useful in this study Perfect dark resistance: 0.5 Mohm Good response time: 20 ms (Rise), 30 ms (Down) Resistance illumination: 4	0.133
HiLetgo® L298N Motor Drive Controller Board Module Dual H Bridge DC Stepper For Arduino	HiLetgo®	Over-temperature protection Maximum supply voltage 35 V Maximum output DC current 4 A Low saturation voltage Logical “0” input voltage up to 1.5 V	2.470
Uxcell Female DC Power Jack Socket Connector	Uxcell	Easy to connect Barrel connectors are not rare and used universally	1.018
HiLetgo 5V 650 nm 5 mW Red Dot Laser Head Red Laser Diode Laser Tube with Leads Head Outer Diameter 6mm	HiLetgo®	Optimal temperature tolerance: −36~65 °C operating temperature range Low working voltage: 5 V DC	0.599
EDGELEC 100 K ohm Resistor 1/4 w (0.25 Watt) ± 1% Tolerance Metal Film Fixed Resistor	EDGELEC	Long working life High temperature resistance Moisture proof	0.057
JOVNO 12V 1A Power Supply Adapter 100–240 V AC to DC 12volt 12 W 1amp 800 mA 500 mA Power Converter Transformer with 5.5 × 2.5 mm Tip	JOVNO	Universal adapter: Built in automatic over-voltage protection, Over-current protection Over-temperature protection Short circuit protection Fire retardant shell	3.990
Zlolia 12 V Waterproof LED Strip Light 5 M 300LEDs	Zlolia	Waterproof Long life span: 50,000 h	0.010
Mini DC Brushless Water Pump JT-600C-12 16 mm Internal Thread	Zjchao	Long life and low noise, easy to install The pump is made of resin glue seal which is of good insulation	6.280