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Optocoupler
An optocoupler can be used to control a circuit that's completely isolated from your microcontroller. In this case, imagine that the LED and battery pack are a hacked toy which you're turning on and off with Arduino.
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Use an optocoupler such as the 4N35. Connect the optocoupler's pin 2 through a 220Ω resistor with Arduino's pin 11, and pin 2 with Arduino's ground. Then connect your external circuit to pins 5 (collector) and pin 6 (emitter). You can also apply voltage to pin 4 (base) of the optocoupler to raise the gain (just like with a normal transistor). |
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thesavager # Sept. 18, 2009, 7:57 p.m.
Hi Omer, I saw a few errors in your documentation, so I've corrected it for the others. Use an optocoupler such as the 4N35. Connect the optocoupler's pin 1 through a 220Ω resistor with Arduino's pin 11, and pin 2 with Arduino's ground. Then connect your external circuit to pins 5 (collector) and pin 4 (emitter). You can also apply voltage to pin 6 (base) of the optocoupler to raise the gain (just like with a normal transistor). Gr. Pascal