Automobile Gears Indicator

Published:2011/5/13 6:33:00 Author:Sue | Keyword: Automobile, Gears, Indicator | From:SeekIC

When the automobile is in neutral, S's 0 terminal is connected to the ground, the VD1-VD4 are disconnected. IC2's inside NOT gate D1-D3 output low level, and the LED indicator shows the number 0 . When it's in gear 1, S's 1 terminal is connected to the ground, and NOT gate D3 will output high level. The indicator shows 1 . When it's in gear 2, 2 terminal is connected to the ground, and NOT gate D1 will output high level. The indicator shows 2 . When it's in gear 3, 3 terminal is connected to the ground, VD1 and VD2 are connected, NOT gate D1 and D3 will output high level. The indicator shows 3 . When it's in gear 4, 4 terminal is connected to the ground, and NOT gate D2 will output high level. The indicator shows 4 . When it's in gear 5, 5 terminal is connected to the ground, VD3 and VD4 are connected, NOT gate D2 and D3 will output high level. The indicator shows 5 .



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