LED grid
so need make led grid.
the input changing analog signal (whose voltage ranges don't know yet). need rectify signal (convert negative voltages positive), i'd light different number of leds based on value of rectified signal. if it's low voltage (but higher zero), i'll want 4 (or maybe 6 or
of color led light (say blue). @ higher voltage, i'll want 4 blue led's light up, 4 more leds (say green) light well. @ higher voltage, i'll have 4 blues, 4 greens, , 4 yellows (or whatever color) light up. i'd have @ least 4 different stages (each stage being 4 more leds light up), , needs voltage regulated (i don't want blow blues, when have high enough voltage turn on yellows).
the input voltages changing pretty fast, ideally needs pretty responsive.
because school project, need able build of possible basic components (r's, l's, c's, transistors, op-amps, diodes, etc) opposed buying ics me.
i figure can rectify this
at front, should able use switches varying resistors turn on each new set of leds, how regulate voltage don't blow first stage (blue) led's when turn on later stage (yellow) led's?
the input changing analog signal (whose voltage ranges don't know yet). need rectify signal (convert negative voltages positive), i'd light different number of leds based on value of rectified signal. if it's low voltage (but higher zero), i'll want 4 (or maybe 6 or
of color led light (say blue). @ higher voltage, i'll want 4 blue led's light up, 4 more leds (say green) light well. @ higher voltage, i'll have 4 blues, 4 greens, , 4 yellows (or whatever color) light up. i'd have @ least 4 different stages (each stage being 4 more leds light up), , needs voltage regulated (i don't want blow blues, when have high enough voltage turn on yellows).the input voltages changing pretty fast, ideally needs pretty responsive.
because school project, need able build of possible basic components (r's, l's, c's, transistors, op-amps, diodes, etc) opposed buying ics me.
i figure can rectify this
at front, should able use switches varying resistors turn on each new set of leds, how regulate voltage don't blow first stage (blue) led's when turn on later stage (yellow) led's?
quote
(convert negative voltages positive)what negative voltages? analog signal coming from? have arduino? can post picture or drawing of grid?
what describing sound voltage or signal meter can done on arduino. can done simple comparator chips, lm339 or lm324, both of can bought @ radioshack or online.
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