Build Instructions

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• 1

  Step 1

  Hello!

  This is a tutorial for beginners, that will help you create a "Mystery Box" that will only open after using all three inputs (HC-SR04 Ultrasound sensor, Photoresistor, and an NTC Thermistor).

• 2

  Step 2

  After gathering all needed items, you can wire them like I did in this Fritzing Diagram:

  For the NTC Thermistor I used a 10k resistor.

  For the Photoresistor I used a 5k resistor.

  You can use regular 220 ohm resistors for the LEDs.

• 3

  Step 3

  You can position the "sensors" how you'd like it the most in the box, but for me, this was the most easy and effective way.
  

  
  

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