justDIY
Active Member
I need some recommendations for ways to discretely control 180 leds. what I want to build is a circle, circumscribed with 60 RGB leds (180 leds total) .
right now I'm thinking about eight shift registers per color group, that'll give me 64 channels, times three, for a total of 192. I seem to recall seeing a 32 bit shift register from MAXIM or maybe it was someplace else - probably cost more than 8 74hc595's would cost.
I'm thinking I'll make up a circuit board to hold the 24 shift registers, and then use headers / cable harness to wire up the leds. Or I might need to make three circuit boards, with just 8 registers each - it depends how messy the routing becomes.
I'm wondering how to calculate the update rate I can expect shifting out 192 bits of data with a 20mHz pic.
Is there an easier way I'm overlooking? I thought about some sort of multiplexing or matrix building, but the leds kinda prevent that - they'll either be common anode or common cathode depending on the cost from the supplier.
right now I'm thinking about eight shift registers per color group, that'll give me 64 channels, times three, for a total of 192. I seem to recall seeing a 32 bit shift register from MAXIM or maybe it was someplace else - probably cost more than 8 74hc595's would cost.
I'm thinking I'll make up a circuit board to hold the 24 shift registers, and then use headers / cable harness to wire up the leds. Or I might need to make three circuit boards, with just 8 registers each - it depends how messy the routing becomes.
I'm wondering how to calculate the update rate I can expect shifting out 192 bits of data with a 20mHz pic.
Is there an easier way I'm overlooking? I thought about some sort of multiplexing or matrix building, but the leds kinda prevent that - they'll either be common anode or common cathode depending on the cost from the supplier.
