telephoneman Posted January 19, 2007 Report Share Posted January 19, 2007 Hey everyone... very new to the electronics field. Taking a class in it an need a little help with a project. Trying to sequence two set of five leds. five in one direction(on on switch) five in the other direction(other switch). would like to have led 1 light and stay lit then 2 to light and stay lit and so on until #5 lights and then resets the sequence. what do in need for parts? Can this be done with a 555 and a 4017 cmos chip or do i need to look elsewhere? Any helpful advice would be greatly appreciated. Mark Quote Link to comment Share on other sites More sharing options...
audioguru Posted January 19, 2007 Report Share Posted January 19, 2007 Hi Mark,Welcome to our forum. ;DA 4017 would light one LED at a time.An LM3915 logarithmic voltmeter world be able to do what you want if it is set for the bar mode as it indicates the exponential rising voltage of a capacitor charged by a resistor. It has outputs for up to 10 LEDs. Quote Link to comment Share on other sites More sharing options...
telephoneman Posted January 19, 2007 Author Report Share Posted January 19, 2007 i appreciate the info.. if you don't mind me asking... these are for like a blinker set up on a motorcycle, what would i look for in the specs of the leds? do you know? Quote Link to comment Share on other sites More sharing options...
audioguru Posted January 19, 2007 Report Share Posted January 19, 2007 A turn signal for a motorcycle needs very high power and wide angle LEDs and a high power circuit to drive them. An LM3915 drives ordinary LEDs with fairly low power. Each of its outputs would need a power transistor added to drive a high power LED. Quote Link to comment Share on other sites More sharing options...
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