TRICK OR TREAT DOORBELL PRANK

This doorbell is the perfect way to scare trick or treaters who come to your house!

By using Arduino we built this doorbell which drops a spider when it is ringed, scaring the trick or treater.

When movement is detected by the Ultrasonic Distance Sensor a light turns on inviting the person to ring the bell, and when the doorbell button is pushed, a big black spider will drop from inside the doorbell box making a startling sound triggering fear to the person who pushed it.

This can be a great product to add to your Halloween wish list, as it will definitely terrify your guests and give you a good laugh.

#halloween #doorbell #arduino

Supplies

ELECTRONIC SUPPLIES:

• 1 ARDUINO UNO
• 1 Protoboard
• 30 Breadboard Jumper Wires
• 1 Pushbutton
• 4 240 Resistors
• 1 Servo
• 1 Ultrasonic Distance Sensor
• 1 Speaker/Buzzer
• 3 Red light LED

SUPPLIES AND TOOLS TO BUILD THE PROTOTYPE:

• 1 box (we used a cardboard one)
• Black spray
• Silicone gun
• Black Silicone
• 1 Cutter
• 10cm of fishing line
• Rubber spiders
• Letter stickers

Step 1: Schematic of Electrical Connections

Begin by building the circuit following this schematics mounted on the TinkerCad software.

Step 2: Flow Diagram

The following flow diagram is a representation of the code in a more visual way; it allows us to make a step-by-step approach to make the construction of the code easier.

Step 3: Code

Once we have built the circuit shown in Step 1, we can connect the Arduino UNO to our computer and upload the code.

The following file has the code needed for this project:

Step 4: Prototype Step by Step

1. Before starting to build the exterior part of our project, it is best to first build the circuit following the schematics shown in Step 1 to make sure everything works. This way we prevent to make changes once everything is put together, and we make sure everything fits inside the box.

The best way to carry out this project would have been to weld all the elements in a soldering board to prevent accidents, but this was not possible in our case for various reasons.

2. Now that the circuit part is all set, we can start to build the exterior part of our project.

We want to match the halloween aesthetic, but it is up to everyone who builds it the looks they want to give to their doorbell.

3. First, we begin with the structure of the doorbell, for this, we reused a cardboard box we had which has a lid we could use to see the circuit.

We cut an opening at the bottom of the box to put the doorbell button and let the spider fall through it.

We also cut a whole on the top of the box to let the Arduino cable out.

4. Then, we take the lid, and we make two round wholes the size of the Ultrasonic Distance Sensor. We also made a whole simulating a scary face to put the LED through the eyes, but as we said, everyone who builds this can make it as they like.

5. For the spider, we grab the fishing line, and by making a small whole in the rubber spider, we tie the fishing line to it. Then, we attach the fishing line to the servo motor to allow the movement of the spider.

6. As the button is in the Protoboard, we have to build an elongation of this one, so we are able to press it without having to put our hand inside the box. To do that, we glued some metal sheets together with the black silicone.

7. For the final aesthetic touches, we painted with black spray the box and glued some rubber spiders to it as well.

We also wrote with letter stickers some Halloween themed messages and our names.

Step 5: Conclusion

This doorbell is great for the Halloween season, at first sight, all you see is a regular doorbell, and you don't expect anything that is going to happen.

This project was made to put into practice the Arduino knowledge that has been given in our university class, and it has been really useful to learn to combine different components as distance sensors, servos, speakers and LEDs and design a product around the circuit. Now, we also understand the vast possibilities of Arduino, and we will be able to apply them to other projects and prototypes.

Finally, we would like to add that the results we have obtained are satisfactory, but we would have liked to have enough time and knowledge to be able to weld the circuit to a soldering board. Nonetheless, it has been really fun to build this product, and we are happy to say that we achieved very positive results.

HAPPY HALLOWEEN!!

Project made by: Ben Monahan & Clara Valsells