Introduction: Wavepad - Gesture Controlled Raspberry Pi Music Player

Wavepad is a gesture controlled music player. It is built using Raspberry pi microcontroller. With Wavepad you can increase and decrease the volume of the song, play next song, play previous song, pause and resume song. To recognise the gestures we are using 2 types of sensors. First one is Ultrasonic sensor which is used to control the volume and Other is IR proximity sensor x 2 which are used to change ,pause and resume songs.

Step 1: What You Will Need?

Picture of What You Will Need?

Raspberry pi 3 Model B X 1

Speaker X 1

Ultrasonic Sensor X 1

Photodiode X 2

IR LED X 2

Resistor 1K X 18

Resistor 10K X 2

Resistor 100 Ohm X 2

Pot 10K X 2

PCB X 1

LED Blue X 12

Connecting Wires

IC LM324SN X 1

Soldering Gun

Step 2: Building Circuit

Picture of Building Circuit

In our circuit there are three main parts.

1. IR Proximity sensor

2. Ultrasonic Sensor

3. LED's

We will go to each parts step by step.

Step 3: Build IR Proximity Sensor

Picture of Build IR Proximity Sensor

A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact. We are using 2 proximity sensors in our project it will be used to play next or previous and pause the song.

To build the circuit follow the above circuit diagram.

Explanation of Diagram

We are using pair of Photodiode and IR LED's. Photodiode is connected to 10K Resistor while IR LED connected to 100 Ohm Resistor. S1 & S2 outputs are connected to LM324SN Operational Amplifier which amplifies the voltage according the Potentiometer connected. The output of the LM324SN is 5V. But we need 3.3.V to Raspberry Pi therefore we are using Voltage Divider Circuit.

Connect Output O1 & O2 to GPIO 27 & 17 Pins respectively.

Step 4: Connecting Ultrasonic Sensor

Picture of Connecting Ultrasonic Sensor

We connect Ultrasonic Sensor as follows

VCC -----> 5V

GND -----> GND

TRIGGER----> GPIO 04

ECHO -----> Voltage Divider Circuit------>GPIO 22

Echo gives output 5V but Raspberry pi needs 3.3V therefore we are using Voltage Divider Circuit to make voltage equivalent to 3.3V.

Step 5: Connecting LED's

Picture of Connecting LED's

LED's are used to Indicate the volume level. We are using 10 LED's but you can use as many as you want. Each LED's Cathod is connected to common ground and Anode connected to 1K Resistor , then connected to GPIO Pins from Raspberry Pi.

Connect LED's To Following GPIO Pins:

LED1 --> GPIO 14

LED2 --> GPIO 15

LED3 --> GPIO 18

LED4 -- > GPIO 23

LED5 --> GPIO 24

LED6 --> GPIO 25

LED7 --> GPIO 8

LED8 --> GPIO7

LED9 --> GPIO 12

LED10 --> GPIO16

Step 6: Coding

Steps to run the program:

1. Download the wavepad.py file and put it in /home/pi directory of raspberry pi.

2. Put songs in /home/pi/Music directory

3. Now we need our python script to execute at startup. To do this follow these steps:

a. Type sudo nano .bashrc

b. Add this line without quotes "sudo python wavepad.py &"

c. Go to Application Menu -> Preferences -> Raspberry pi configuration -> Then click on To CLI Radio button.

d. Restart your pi

Step 7: Finishing Up.

Picture of Finishing Up.

Now it's time to put our circuit in case. I didn't have 3D printer that's why i handmade this simple box using cardboard. And just stick printed paper on it.

If you like this Instructable please vote for it in Microcontroller Contest. Thank you

Comments

rejsps (author)2017-11-06

I am about to start building this, but there is no instruction on how to adjust the 10k pots for the left and right IR sensor inputs. The op amp is apparently a comparator, so these set the point at which it switches based on the signal from the photodiode. But what is the best way to set it? Also, the video suddenly ends, and it is not clear how to pause and restart playback. Thanks.

MitchelJ5 (author)2017-09-21

I was jut wondering where the speaker and power soure is connected don't know much about electronics

About This Instructable

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Bio: I'm robotics enthusiast and software developer.
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