CMSIII Bed of Nails

Bed of Nails

We had spent two lessons to build up this device. The function of this device is to create the sounds through these 8 nails.

Materials list of "Bed of Nails"

1. 1 wooden board
2. 8 nails
3. 4 10k Ohm resistors
4. 1 18k Ohm resistor
5. 1 1M Ohm resistor
6. 1 battery clip
7. 8 Wines
8. 1 Audio Jack
9. 1 0.22 uf capacitor
10. 1 47 uf capacitor

Doing "Bed of Nails" is really fun. But, the process of making this device is quite complicated and difficult. It is because we need to connect each point clearly and to make sure that there is no any misunderstandings of looking at this electric circuit.

For the lecturers' mention, we can design two ways of this device. Option one is setting the nails on two sides only. Another option is setting the nails on all sides. I choose the two sides nails version of my design. I think it will be easily to create the sounds by our hands. The most difficult part during making this device is to confirm all the connection of the solder wire and the chip are separate clearly. If not, the circuit will be not succeed. Thus, using the solder is the most important and difficult part  of this device.

Finally, I succeeded to finish "Bed of Nails". I can use the sound mixer to test my device is success or not. These 8 nails had create different electric sounds through the sound mixer. It is really interesting to create my own electric song. 

<~Here is the first LED light blackboard in CMSIII.

On last Thursday morning, I had my first lesson of CMS III. In that lesson, we need to build up the blackboard to glow the LED light up.





These are the main materials that we need to use on building this LED light blackboard:

1. Blackboard
2. 9V battery
3. Power switch
4. LED light
5. 220 Ohm Resistor

In this workshop, it will provide three different resistance values of the resistor. Thus, we need to find out which resistor is suitable of this LED light blackboard. They are 220 Ohm 5% (Red Red Brown Golden), 470 Ohm 5% (Yellow Purple Brown Golden) and 1000kOhm 5% (Brown Black Green Golden). If the resistance values of the resistor is over than the LED light needs, the LED light will not be glowed. Finally, we find that 220 Ohm 5% resistor is suitable for the LED light. Therefore, it will be the best resistor to use in this circuit.

In Kenny tutors, we need to build up the similar circuit on the in the lab. However, because of the power cut of our lab, the circuit is incomplete. So, we will continue in next Kenny's tutor lesson.