In this instructable, I will show you how to make a simple toy that combination of the LEDs flash and Theremin. We're gonna using some basic electronics built on top of an Arduino. The basic idea of 7 Segment LED Display was from Enjoying Electronics. The original Enjoying Electronics article is here, you can get more details of explanation about making 7 Segment LED Display there.

The basic idea was to use a LED display programming by Arduino that can display some character with various intensity of flash. Then I saw some Theremin Instructables using Light sensor that made a unique sound when it given the light. Then the idea to combine the both project really made me excited.

This project was made for my own project on campus. It is built since 3 months ago, so there will be some different picture for one part, because it's been fixed from time to time, and continues to have a progress.

This circuit it's so simple, but the process requires patience, precision, and efficiency.

This is the video of my Arduino - Theremin with 7 Segment LED Display
(change the quality for a better view)

Okay, let's get started.

Step 1: Parts and Tools

Here is all you will need:
(1) Arduino UNO R3
(1) 10K potentiometer
(21) LEDs (White, Red, Green, Blue, Yellow)
(2) Push Button
(1) LDR (Light Dependent Photo Resistor)
(1) PCB Matriks / Perfboard
(1) Speaker 8 ohm (0,5 - 0,6 watt)
(2) 10uF Electrolit Capacitors
(3) 10K ohm resistors
(7) 100 ohm resistors
(1) 9V battery
(1) 9V battery box with on-off switch
(1) Potentio knob
(3) Spacer 0,5 cm
(4) Spacer 1 cm
(2) Spacer 2 cm
(1) Project enclosure
- Breadboard
- Shrink tubing
- Jumper wire
- Rainbow wire (optional)
- Male header extended (optional)
- Male header bended (optional)
- Blackhousing / female 1x1 header (optional)

- Soldering iron
- Solder
- Hot glue
- Mini drill
- Pliers
- Cutter
- Helping hands (if you don't have it, you can build it from my helping hands instructable )
<p>Where's the inexpensive place that made your PCBs? I wouldn't mind finding a shop that does small quantities or one-off boards on the cheap.</p>

About This Instructable




Bio: Bachelor of Wireless Telecommunication Engineering from Bandung State Polytechnic, Indonesia | Software QA - Junior Engineer at Oberthur Technologies | A Rhesus(+) | Aries | Photography | Computer Geek | Chiliphobia | Art ... More »
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