Midi for the Arduino - Build a Midi Input Circuit

Less talking, more building!

In this installment we are going to assemble a Midi Input Circuit and connect it to your Arduino UNO. The Circuit itself is actually quite simple consisting of only a handful of parts.

In the last installment, we looked at a Circuit Analysis of a Midi Input and Output Circuit. If you are new to this series, I suggest you check it out. It will give you a better understanding of what you are actually building. Now, let's put this knowledge to use and start building the hardware.

I am assembling the circuit on a small solder-less breadboard. The video will walk you through the steps of putting it together. Take your time and double check your work. You'll be fine!

Parts List (Click links to view parts on Amazon.com)

• 1 x Arduino Uno
• 1 x Solderless Breadboard
• 1 x 6n138 Optocoupler
• 1 x 1n914 Diode
• 1 x 5-Pin Din Jack (Midi jack)
• 3 x 220 Ohm Resistor (1/4 Watt)
• 1 x 4.7K Ohm Resistor (1/4 Watt)
• Jumper wires

Schematic (I find it helpful to have a printed copy when I am building)

In the next installment, we look at the Arduino MIDI Library and write software for this circuit.