Project 3 (P.I.A.N.O.)

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Due Date

November 23, 2016

About the Project

In this project, you will be making a "piano". Essentially using the concepts from the first project, but adding several pushbuttons and a variable resistor, you will be able to make varying amounts of sound based on which buttons you press and how much resistance is provided (almost like a mini piano :)) The project consists of 2 parts, in the following order:

  • Breadboarding the P.I.A.N.O.
  • Soldering the P.I.A.N.O. to make it permanent.

Slides: https://docs.google.com/presentation/d/1wleKBcr95Pbt5HvdPjN06SnFvgJbl-qvwFDsohVihMA/edit?usp=sharing

Breadboarding the P.I.A.N.O

For this project, you will need to pick up:

  • Two 2.7k Resistors
  • 8 pin dip socket
  • One 10k resistor.

All of these can be found in the OPS Parts Drawer which is above the OPS Kit drawer in the IEEE Lab. The rest of the parts will already be in your kits (such as the 100nf cap, which is the one you used in project 1, the pushbuttons, potentiometer and 555 timer).

Remember for the pushbuttons to connect them diagonally (as we've explained multiple times) so that you don't short them even before pressing down any buttons. For the potentiometer, remember to only connect 2 of the pins! This way it will act like a variable resistor. The pins we want to connect are the middle pin to the pushbutton and then either the right or the left pins to pin 7 of the 555 timer.

PIANO Schematic

Using the Speaker

  • Now that you know how to solder, you can solder new wires on to the speakers if they fall off!
  • Remember, similar to the 555 Timer and the battery you are not soldering the speakers directly onto your perfboard. You will be cutting up the female headers found in the OPS Parts Drawer and solder those on as holes for your speaker wires. Use the flush cutters in the tools/stationery shelf to cut the female headers into smaller pieces!!!

Soldering the P.I.A.N.O.

Follow the GIFs on the Google Slides for Project 2.

Key Things to Note and Pay Attention To:

  • The temperature of the iron should be between 600F and 650F.
  • Turn off the iron when you leave the station.
  • Plan your traces! (very important for this project in particular)
  • If the desoldering pumps are jammed, use the soldering wicks instead.
  • If the green light on the solder iron flashes on and off rapidly, it means the iron is at the set temperature.
  • Always turn off the iron whenever you leave the station.
  • If you think something is not right, don't try weird things. Ask Sahil, Jiwan, or an officer around you!
  • Make sure you always turn off the iron whenever you leave the station.
  • Clean your workspace when you are finished! It should be cleaner than as you found it.
  • Oh yea, remember to turn off the iron and clean your area!!!