In this tutorial we will build a simple circuit that uses a 555 timer and a Bare Paint potentiometer to make an interactive noise-maker. Before you dive into this tutorial it is worth checking out one of Matt's tutorials on building a potentiometer using Bare Paint. It is a good introduction to painted potentiometers, but not essential if you don't have an arduino. Also, if you are new to the 555 timer and are interested in playing around some more with this little chip, check out one of our earlier tutorials here.
By the end of this tutorial you should have a working 555 noise maker circuit connected to a potentiometer made from paper and Bare Paint. You will be able to change the sound of coming out of the speaker by changing the position of the slider on the painted potentiometer.
In this tutorial we will need to connect to the paint again from our breadboard. Last time we used paperclip wires, but this time we are going to try something else. We are going to use a bulldog clip to connect more securly to the paint and use the slider wire to vary the position on the painted strip.
Step 1: Components
9V Batteries - Jameco
Battery Clip - Jameco
Copper Tape - Jameco
Soldering Kit - Jameco
Bulldog clips - Any stationary shop
Resistors - Sparkfun
Breadboard - Sparkfun
555 Timer - Sparkfun
Step 2: Materials
1. A jar of Bare Paint, paint brush and paper, or use a Bare Pen
2. A 1K Ohm resistor
3. Two electrolytic capacitors around 0.68uF (0.68uF = 680nF = 680 000pF)
4. A small speaker or piezo transducer
5. A 555 timer IC (we are using the LM555CN by siemens)
6. Some wire and a bulldog clip to make your bulldog connector wire (see Connecting to Bare Paint for other methods)
7. Solder-less breadboard and some jump wires
8. Some paper or other non-conductive material to apply the Bare Paint
9. A 9V Battery and a battery clip with wires
Step 3: Painting the Potentiometer
Step 4: Making a Bulldog Wire Connector and a Slider
Take the other wire and connect one end to your breadboard (see schematic) and leave the other end free for sliding. We can simple use the exposed end of the wire to make contact with the paint and generate noise.
Step 5: Circuit Diagram and Breadboard Schematic
Step 6: Placing the Components and Connecting the Circuit
Step 7: Attaching the Bulldog Clip Wire and Making Noise With Your Finger
Step 8: Completed Circuit!
If you have any questions please email them to email@example.com, and don't forget to submit your own projects to firstname.lastname@example.org