Interfacing Dot Matrix led Display with PIC Microcontroller
To know about Interfacing Dot Matrix led Display with PIC Microcontroller, we have to know about what is Dot Matrix Display? And how it work? Dot Matrix Display is an array of LED situated in a form of Matrix. See the architecture of a 7*5 Dot Matrix led Display board.
Project Description :
In this tutorial project we can see how easily we can display any alphabet in 7*5 Dot Matrix led Display board. Let we have to display letter “C” in 7*5 Dot Matrix led Display board. Now look on 7*5 Dot Matrix led Display board it has 7 rows and 5 columns. And see the every Diode connected between raw and column if raw get positive and column get negative then only particular LED will glow. Let suppose we have to glow LED connected between R5 and C1 from above picture. So we have to send 0010000 on raw and 01111 on column. Now let for display letter C which type of data we have to send
Step 1: In Raw = 0111110
In Column= 01111
Step 2: In Raw = 1000001
In Column= 10111
Step 3: In Raw = 1000001
In Column= 11011
Step 4: In Raw = 1000001
In Column= 11101
Step 5: In Raw = 0100010
In Column= 11110
For display complete alphabet “C” we have to send those data with minimum delay to display at once.
Another important think we have to keep in mind that for displaying column we need high current. because see in step 1 we are sending 0111110 so all 5 LED which have to glow in a same column so we need high current to glow all LED at a time. For this purpose we can use ULN 2003a IC which has seven built-in Darlington transistor arrays. It can provide 50volt and 500mAmp current in single chanel. In bellow I give the simulation circuit diagram In Proteus.
For more detail: Interfacing Dot Matrix led Display with PIC Microcontroller
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