Add led/relay driver to drive LEDs, Add current limiting resistors #9

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opened 2023-11-13 04:36:30 +00:00 by AllSpiceUser · 1 comment

AllSpiceUser commented

2023-11-13 04:36:30 +00:00

I doubt you're going to find an open collector counter. The counter I recommended is going to peak out at 20mA total, so if multiple LEDs are on, you're going to disrupt the count.

I recommend adding a driver between the counter and the leds. You also need to add current limiting resistors inline with the LEDs.

Which LEDs were you going to use? I recommend very low currents.

I doubt you're going to find an open collector counter. The counter I recommended is going to peak out at 20mA total, so if multiple LEDs are on, you're going to disrupt the count. I recommend adding a driver between the counter and the leds. You also need to add current limiting resistors inline with the LEDs. Which LEDs were you going to use? I recommend very low currents.

McRaeAlex commented

2023-11-16 20:57:53 +00:00

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Hey @AllSpiceUser,

The CD4017 has its output decoded.

My understanding is that because only a single LED will be on at a time only a single current limiting resistor is needed.

My intention with the board was to have random patterns of LEDs or an animation however settled on the LEDs chasing from the root to the tip of the board as I didn't want to have a microcontroller.

Regarding the LED choice, I haven't picked a particular LED. I choice the 1206 package size because I figured it would be easy enough to solder by hand. I have never had to pick parts before so any guidance in this would be great.

Question: How do I associate a part number? Should it be in the footprint or the symbol?

Hey @AllSpiceUser, The [CD4017](https://www.ti.com/lit/ds/symlink/cd4017b.pdf?ts=1700142944990&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FCD4017B) has its output decoded. !snippet[](badge.kicad_pcb){ commit="c0dd6a46a2c6273fbe83ce5c2bb90908aab98de3" layers="82,62,61,60,59,58,57,33,1,32,34" variant="default" view-coords="34.9,53.3,42.1,64.4" aspect-ratio="1.404" thumbnail="float-left" } My understanding is that because only a single LED will be on at a time only a single current limiting resistor is needed. My intention with the board was to have random patterns of LEDs or an animation however settled on the LEDs chasing from the root to the tip of the board as I didn't want to have a microcontroller. Regarding the LED choice, I haven't picked a particular LED. I choice the 1206 package size because I figured it would be easy enough to solder by hand. I have never had to pick parts before so any guidance in this would be great. Question: How do I associate a part number? Should it be in the footprint or the symbol?

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Reference: McRaeAlex/badge#9

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