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Step 4Build the LED chaser effect
I found this 10 LED chaser circuit on the web, and integrated into my design.
This circuit produces the sequentially flashing line of blue LEDs that shoot down the sides of the blaster when it is fired.
The circuit consists of another 555 chip, this time wired as a straight oscillator. The oscillator output drives the 4017 decade counter chip, which has 10 transistor outputs.
I wired up 2 arrays of 10 LEDs, one for each side of the gun, and hooked them to the appropriate pins on the 4017. I built the chaser effect on a second circuit board because I ran out of space on the first one.
I ran a jumper from the output of the first timer circuit to the LED chaser board where I had installed an NPN transistor to turn on the effect.
The chaser will cycle over and over while the signal is high, so I adjusted rate of the oscillator (variable resistor on pin 6-7 on the 555 chip) so that the chaser would do one full cycle during the time that the effect was in effect.
As you start wiring this stuff together, be sure to keep the final enclosure in mind, my gun was pretty jam-packed with wires when I was done. I could have planned a little better. It might have been worth doing a printed circuit board for this project.
This circuit produces the sequentially flashing line of blue LEDs that shoot down the sides of the blaster when it is fired.
The circuit consists of another 555 chip, this time wired as a straight oscillator. The oscillator output drives the 4017 decade counter chip, which has 10 transistor outputs.
I wired up 2 arrays of 10 LEDs, one for each side of the gun, and hooked them to the appropriate pins on the 4017. I built the chaser effect on a second circuit board because I ran out of space on the first one.
I ran a jumper from the output of the first timer circuit to the LED chaser board where I had installed an NPN transistor to turn on the effect.
The chaser will cycle over and over while the signal is high, so I adjusted rate of the oscillator (variable resistor on pin 6-7 on the 555 chip) so that the chaser would do one full cycle during the time that the effect was in effect.
As you start wiring this stuff together, be sure to keep the final enclosure in mind, my gun was pretty jam-packed with wires when I was done. I could have planned a little better. It might have been worth doing a printed circuit board for this project.
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Nice cirquit, but i need 2 of these and one 5 led chaser, can this be powered by one or 2 USB Ports?
And if so, how do i do it?