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This is a simple but very basic challenge. Related to the water switch instructable:
http://www.instructables.com/id/Water-switch/
Components
Buy a cheap (less than 2 euro's) LED Christmas thing, just having 20 LED's, connected to a nice battery casing.
(The advantage is that you don't have to solder the LED's.)
We will use a transistor BC547 (15 cents) and a resistor, 5K 10 cents.
The LED's will be on using the switch on the casing.
Challenge:
Make this go on and off using a transistor and the Arduino.
http://www.instructables.com/id/Water-switch/
Components
Buy a cheap (less than 2 euro's) LED Christmas thing, just having 20 LED's, connected to a nice battery casing.
(The advantage is that you don't have to solder the LED's.)
We will use a transistor BC547 (15 cents) and a resistor, 5K 10 cents.
The LED's will be on using the switch on the casing.
Challenge:
Make this go on and off using a transistor and the Arduino.
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Signing UpStep 1Cutting
Step 1.
Cut one of the two wires going to the LED's.
Because of the knot we cannot be sure which wire we have cut.
Cut one of the two wires going to the LED's.
Because of the knot we cannot be sure which wire we have cut.
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Apr 10, 2012. 2:42 PMferdna
says:
I believe your picture is wrong. the transistor base goes to the arduino pin and the emitter to your VCC and the collector would be VCC as well and not ground.
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