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Car Multi-Function Alarm Circuit

2017-01-16 18:41  
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Car Multi-Function Alarm Circuit
Functional requirements: When the car has got one of the malfunctions which could be detected by the system and the system would have the voice prompt alarm.Voices: left-front wheel; right-front wheel; left-rear wheel; right-rear wheel; right-rear wheel; too low tire pressure; too high tire pressure; please change battery; ding-dong.Control ways: parallel mode.voices' corresponding address: (it is added a 200ms mute case between every voice's combination)00H ding-dong + left-front wheel + too high tire prssure.01H ding-dong + right-front wheel + too high tire prssure.02H ding-dong + left-rear wheel + too high tire prssure.03H ding-dong + right-rear wheel + too high tire prssure.04H ding-dong + left-front wheel + too low tire prssure.05H ding-dong + right-front wheel + too low tire prssure.06H ding-dong + left-rear wheel + too low tire prssure.07H ding-dong + right-rear wheel + too low tire prssure.08H ding-dong + left-front wheel + please change battery.09H ding-dong + right-front wheel + please change battery.0AH ding-dong + left-rear wheel + please change battery.0BH ding-dong + right-rear wheel + please change battery.The circuit's principle diagram is shown in the pictrue.