2,486
edits
Changes
Jump to navigation
Jump to search
Line 115:
Line 115: − +
Activities/Turtle Art/Using Turtle Art Sensors (view source)
Revision as of 04:38, 10 November 2010
, 04:38, 10 November 2010→Carbon Microphone
[[File:Complete microphone.jpg]]
[[File:Complete microphone.jpg]]
Experiment with the fineness of the crushed charcoal and the tension in the foil. The more squashed the charcoal is, the lower the resistance. Aim for a resistance of around 3k ohms and definitely 700 ohms < resistance < 14k ohms.
Experiment with the fineness of the crushed charcoal and the tension in the foil. The more squashed the charcoal is, the lower the resistance. With the XO1, aim for a resistance of around 3k ohms and definitely 700 ohms < resistance < 14k ohms.
Graph the resistance, pressing on the foil changes the resistance. You have built a pressure sensor. It can also sense air pressure. You have built a microphone. Change to Sound sensing. On my first try I was able to sense clapping.
Graph the resistance, pressing on the foil changes the resistance. You have built a pressure sensor. It can also sense air pressure. You have built a microphone. Change to Sound sensing. On my first try I was able to sense clapping.