# \#scan

**URL:** https://forum.midibox.org/tag/scan/569.md

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## [Bidirectional two lead duocolor LED BLM](https://forum.midibox.org/t/bidirectional-two-lead-duocolor-led-blm/18993)

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**Author:** [@Highcooley](https://forum.midibox.org/u/Highcooley)\
**Replies:** 2\
**Last updated:** [April 8, 2015, 10:07am UTC](https://forum.midibox.org/t/bidirectional-two-lead-duocolor-led-blm/18993 "2015-04-08T10:07:33Z")

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Has anybody built a BLM with bidirectional two lead duocolor LEDs, where the two colors can be adressed by reversing the polarity? How would the scan circuit have to be designed in order to work with the standard …