Questions regarding multiplexing a common anode RGB led matrix
so, acquired rgb led matrix ,because i'm new electronics, don't know stuff should.
i'm planning on driving board using 4 74hc595 shift registers , arduino uno (later on i' ll try switch arduino nano)
my questions are:
i have attached datasheet of matrix (here is link too). if more information needed please let me know, thanks!
i'm planning on driving board using 4 74hc595 shift registers , arduino uno (later on i' ll try switch arduino nano)
my questions are:
- what resistor value guys suggest use drive each set of colors?
- if rgb led matrix has different values red blue, should use different resistor value?
- i planning on using 5v power supply (the arduino's) can use 9v, 1 should use?
i have attached datasheet of matrix (here is link too). if more information needed please let me know, thanks!
if use 595 registers drive matrix have use high value series resistors avoid overloading pins connected anodes. mean matrix dim , perhaps visible in dark room.
each pin on 595 can source maximum of 35ma 1 of matrix anodes. them have shared between 8 red, 8 green , 8 blue leds, 24 in total, 1.5ma each. 1 in 8 multiplex, leds receive 0.2ma on average 1%of leds maximum current.
so other questions not relevant until have decided on better circuit drive matrix.
another consideration colours , how many want see. if want red, blue, green, yellow, cyan magenta , white, easy shift registers, of want mix more colours, may want consider chips pwm outputs. can mix more colours shift registers using arduino perform pwm in sketch, may crude , limited speed of arduino.
we can suggest many ways around these problems using different chips or transistors our answers depend on how bright need matrix , how many colors want mix, , how complex or simple want make project.
each pin on 595 can source maximum of 35ma 1 of matrix anodes. them have shared between 8 red, 8 green , 8 blue leds, 24 in total, 1.5ma each. 1 in 8 multiplex, leds receive 0.2ma on average 1%of leds maximum current.
so other questions not relevant until have decided on better circuit drive matrix.
another consideration colours , how many want see. if want red, blue, green, yellow, cyan magenta , white, easy shift registers, of want mix more colours, may want consider chips pwm outputs. can mix more colours shift registers using arduino perform pwm in sketch, may crude , limited speed of arduino.
we can suggest many ways around these problems using different chips or transistors our answers depend on how bright need matrix , how many colors want mix, , how complex or simple want make project.
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