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Im trying to used a hacked optical mouse to drive a relay. The tracking LED in the mouse is lit when the device is on and the LED is off when the unit is in sleep mode (the USB port has power in both modes). The tracking LED is pulsed around 4Khz. I want to smooth the 4Khz signal so that I can drive a relay (ie LED lit - even +/- 4Khz the relay triggers, LED off the relay is off). I was fooling around with some RC filters but couldn't get the desired result. Some help would be appreciated. |
September 02, 2017 |
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You're on the right track with filters. Try adding a transistor to provide enough current to drive the relay. |
September 04, 2017 |
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Thanks. The transistor wan't the problem (always intended to use one). problem was the 4K signal was causing the relay to buzz. ended up using RC filter with a diode and it worked. |
by JackPollack September 04, 2017 |
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