helpp...im building a bank/post office turn number project!! - Electronic Circuits Projects Diagrams Free

janenaive · 10th February 2004, 09:33 AM

im building a bank/post office turn number project that use 7 segment display as the output and switches as the input and microprocessor 6802 and PIA to programme the circuit...i need help how to connect the input and the output to/from the microprecessor circuit to/from the switches and 7 segment display...i learned that i have to use latch and buffer...but nopeeee...still no idea!!!!

ops: [/b]

handylee · 10th February 2004, 03:17 PM

Just set every one pin of the switches to the port of the microcontroller, then the other one of the pin of every switches set to ground. The port of micro is ussually on the HIGH stage. If the switch is change, the micro will detect LOW on its port. For the 7 segment display, you can interface with BCD to 7 segment IC 7447 TTL. You just send the BCD number to the port of micro. How to use it, you can see on the datasheet of 7447.

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10th February 2004, 09:33 AM	(permalink (permalink))
janenaive	helpp...im building a bank/post office turn number project!! im building a bank/post office turn number project that use 7 segment display as the output and switches as the input and microprocessor 6802 and PIA to programme the circuit...i need help how to connect the input and the output to/from the microprecessor circuit to/from the switches and 7 segment display...i learned that i have to use latch and buffer...but nopeeee...still no idea!!!! ops: [/b]

10th February 2004, 03:17 PM	(permalink (permalink))
handylee	I/O Just set every one pin of the switches to the port of the microcontroller, then the other one of the pin of every switches set to ground. The port of micro is ussually on the HIGH stage. If the switch is change, the micro will detect LOW on its port. For the 7 segment display, you can interface with BCD to 7 segment IC 7447 TTL. You just send the BCD number to the port of micro. How to use it, you can see on the datasheet of 7447.