We will use Arduino to build an entertainment system in this project. Creating random sounds out of the pen or table is an ingrained habit for all of us. There's no doubt that doing this at least once is not considered good manners, but we're all used to doing it. Therefore, I decided to take it one step further by using Arduino's tone-playing abilities. With this project you will be able to tap on anything conductive and generate tones, like playing the Piano on your palm, and create your own rhythms.

Here is the list of materials required for this project. There is no need to stick to the list. You can build it based on your own design once you understand the basic idea.

Arduino Pro Mini Piezo Speaker Flex Sensor Finger Gloves 10K Resistors BC547 Transistors 9V Battery

During the development of this project, we used a total of four sensors: two flex sensors and two Darlington pairs functioning as a touch sensor. Secondly, we have attached two 10k resistors R1 and R2 to the Flex sensor as pull-down resistors. Using one finger to generate three distinct tones based on how much it has bent, the Flex sensor here makes use of this technology. This means that two fingers can generate six different sounds.

It is important that we understand what Darlington is and how it relates to our project before we move forward. The Darlington pair can be defined as two bipolar transistors connected in a way that in case of current amplification by the first transistor, the current is amplified further by the

This circuit consists of two BC547 transistors whose collectors are tied to their respective collectors and whose emitters are connected to the bases of their respective transistors, as shown above. A small signal applied to the first transistor base will bias the second transistor base, which means that the circuit functions as an amplifier. Our body serves as a ground for the second transistor so the transistor becomes biased whenever our bodies touch the base of the transistor. In order to make this project a success, we utilized this knowledge to build the touch sensor. Two Arduino interrupt pins, numbers 2 and 3, are pulled high using internal pull-up resistors. After the Darlington switch closes, these pins will be

grounded. The interrupt will be triggered every time the wire touches the base of the transistor (1st transistor) on the Arduino. I added a flex sensor that alters the tone according to how much the finger is bent, so I can generate more tones using fewer fingers. I have programmed the system to produce three different tones for each finger depending on how far it is bent (flex sensor). Having access to more tones at your fingertips is possible by increasing the number. In order for the board to fit easily in my palms, I made it on a perf board, however you can also build it on a breadboard. It is important that you touch the ground of the circuit during the course. You should have something similar to this once you've soldered everything As displayed above, I have secured the Darlington pair wires and the flex sensor with two finger gloves. While playing your tone, you can come up with a better idea (if possible) to secure the earphones in place. Working: You can then mount them on your fingers once the hardware is ready. Ensure that you are touching the ground at some point on the circuit.

You should now be able to hear the tone by touching any conductive material or your body. The taps can be played at different intervals, at different positions, to create your own melody.