LED Matrix - Time / Date / Temperature - PIC16F877
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Uploaded by wellyb00t on Aug 10, 2009
9x (8x8) led matrix panels put together to make up a 24x24 Matrix, At the moment displaying Time/Date/Temp + A special message to someone!
the 24 rows are connected to 3 8bit output Ports on the PIC
the 24 columns are scanned using 4015 shift registers & ULN2003 transistor arrays
LM35 is used to measure temperature and connected to A/D pin on PIC
DS1307 Real Time clock connected via I2C bus to PIC
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Uploader Comments (wellyb00t)
All Comments (4)
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What chips did you use to latch/buffer the pic?
I can see a few rows of chips at the bottom of the board.
I'm in the process of building my own as well.
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This uses a PIC16F877, and is still work in progress not finished yet, i dont have any current limiting resistors feeding the led array at the moment which is why the display shows brighter but could lead to earlier failure of the PIC. Also dont have a complete schematic yet
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What chips did you use to latch/buffer the pic?
I can see a few chips at the bottom of the board.
slinger1010 2 years ago
4015 shift registers which feed ULN2003 transistor array IC's
wellyb00t 2 years ago