hello everyone,
i need charlieplexing project in working on. built charlieplexed cube using regular rgb leds , powered directly through arduino , works flawlessly. i'm building second 1 except time i'm using 12v leds , know can't powered arduino don't know how go powering them using external/separate power supply. can point me in right direction?
thanks.
i need charlieplexing project in working on. built charlieplexed cube using regular rgb leds , powered directly through arduino , works flawlessly. i'm building second 1 except time i'm using 12v leds , know can't powered arduino don't know how go powering them using external/separate power supply. can point me in right direction?
thanks.
hi. sounds tricky!
reason is, charlieplexing, know, makes use of fact arduino pins can in 1 of 3 states (high, low, input=high-z).
to drive 12v leds (never heard of way, except strips) arduino output, need pair of transistors, 1 act high-side switch , other act low-side switch. difficult part getting high , low side switches switch on/off correctly, particularly when arduino output goes high-z.
even if can work, have pair of transistors attached each arduino output, , rgb cube going need lot of outputs (15?). means kind-of loose advantage , simplicity of charlieplexing. in case might without charlieplexing.
if/when around building rgb cube, think use ws2812b leds. make wiring simple , allow colour fading & mixing.
paul
reason is, charlieplexing, know, makes use of fact arduino pins can in 1 of 3 states (high, low, input=high-z).
to drive 12v leds (never heard of way, except strips) arduino output, need pair of transistors, 1 act high-side switch , other act low-side switch. difficult part getting high , low side switches switch on/off correctly, particularly when arduino output goes high-z.
even if can work, have pair of transistors attached each arduino output, , rgb cube going need lot of outputs (15?). means kind-of loose advantage , simplicity of charlieplexing. in case might without charlieplexing.
if/when around building rgb cube, think use ws2812b leds. make wiring simple , allow colour fading & mixing.
paul
Arduino Forum > Using Arduino > LEDs and Multiplexing > Charlieplexing help
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