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How to switch between 2 outputs. Answered

Hi. I will try my best to make this intelligible. I have a chaser circuit and I am trying to get all 8 LEDs on at once when power is applied and then the chase circuit to start. At the moment I have a toggle switch which I use to switch between all LEDs on and the chaser if that makes sense. In other words, I put the switch to the left, all LEDs on. Then I switch to the right, all LEDs go off and the chaser goes on. My question is, is there a way to do this without my manual switching? 
Hope this makes sense because it's doing my head in trying to explain. 
Many thanks for any input this may receive. 
Kind regards



Best Answer 5 years ago

This is a simple microprocessor application...
Our ledartist just published an ible you want to see..


Hi thanks for that. I was hoping not to go down the microprocessor route but I will give it a go. It's a great instructable and I look forward to trying it out.
Many thanks again

If you can buy a kit from ledartist then you can program it yourself to do
your all LEDs on at power up ( I call that a Lamp-Test ) and sequential
after that.

Please don't forget to click on best answer :-)

PS.... You are correct this could be done without the micro but would
take about seven individual ICs.
  1. A dual 556 timer
  2. A 4017 sequential shifter
  3. A dual quad selector
  4. Two buffer drivers
  5. Another 4017 IC
  6. Several glue logic chips

Ha. Wow I think I will stick with the micro in that case.
Thanks for your help