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Showing results for tags 'charlieplexing'.
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As the title states, I need help coding an LED cube consisting of 27 RGB LEDs. I am very new to Charlieplexing and I have no idea how to wire it. I have attached the document that I am using to map out my wiring. Please help me complete it! I just need to know what wires I should connect. Thank you! https://ibb.co/jJKVW1Q (actual hardware) https://ibb.co/H7SFxDM (actual hardware) https://ibb.co/yq2Yyd2 (actual hardware) https://ibb.co/1RYFdfK (layout of every LED column) https://ibb.co/3hrMtcj (diagram for 1st set of wires) https://ibb.co/6sdhbjq (diagram for 2nd set of wires) https://ibb.co/tcPSxF0 (diagram for 3rd set of wires) https://ibb.co/Lvtsd8q (diagram for 4th set of wires)
Hi all, I am working on a project which uses 2 x (6 LEDs charlieplexed on 3 I/O lines). I chose for this setup instead of 12 LEDs on 4 I/O lines to up the dutycycle from 1/12th to 1/6th, hoping to increase the brightness. My timer ticks at 512Hz, so in 6/512 seconds all LEDs are cycled and the sequence starts over. The software is working fine, the LEDs are lit.... that is, when I turn off all the lights in the room I can berely discriminate lit from unlit. The LEDs shine so dim it's almost not noticable. I chose red LEDs, because they need the least voltage of all (only 1.8V). For now, I do not use any series resistor. I know the Lauchpad supplies 3.6 volts to the MSP430G2211, the datasheet is somewhat cryptic on that matter. The datasheet says that at a load of 6mA per pin (the total load of 48mA) VoutHi >= Vcc - 0.3V and VoutLow <= Vdd + 0.3V. Now I'm not sure what to make of that, but I think the MSP430 does not supply enough current for my application. I have seen several charlieplexing projects, also on the MSP430. How come my LEDs barely shine at all? What should do the trick? Thanks, roadrunner.