I'm currently making a 100 LED matrix using individual LEDs, rather than premade bargraphs.
Attached is the schematic I'm following
Link to project page:
100 LED 10 Band Audio Spectrum Atmega32 MSGEQ7 With Peak Hold and Fall Down: 6 Steps
I understand that there's a common cathode.
Wondering if the Anode of each horizontal LED row is connected together in series to a single transistor?
Attached is the schematic I'm following
Link to project page:
100 LED 10 Band Audio Spectrum Atmega32 MSGEQ7 With Peak Hold and Fall Down: 6 Steps
I understand that there's a common cathode.
Wondering if the Anode of each horizontal LED row is connected together in series to a single transistor?
Attachments
Yes.
First Anode driver (single transistor) drives ALL the No 1 LEDs
Second Anode driver (single transistor) drives ALL the No 2 LEDs
etc.
First Bar cathodes ALL connect to Pin 1C of U2.
Second Bar cathodes ALL connect to Pin 2C of U2.
etc.
So U2 selects which bar to light and Anode driver selects which level to light.
So, instead of 100 individual transistors, a combination of 10 transistors x 10 cathode drives (ic) = 100 possible LEDs lit.
First Anode driver (single transistor) drives ALL the No 1 LEDs
Second Anode driver (single transistor) drives ALL the No 2 LEDs
etc.
First Bar cathodes ALL connect to Pin 1C of U2.
Second Bar cathodes ALL connect to Pin 2C of U2.
etc.
So U2 selects which bar to light and Anode driver selects which level to light.
So, instead of 100 individual transistors, a combination of 10 transistors x 10 cathode drives (ic) = 100 possible LEDs lit.
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