As shown in the figure, the middle is a 555 Timer. According to the timer principle, the timer will be triggered as long as the voltage at the trigger pin 2 is lower than 1/3Vcc. According to this principle, the car wiper is equipped with a detector between the 2 pin of the 555 and the ground wire as shown. In the figure, S1 can forcibly control the switch of the whole circuit. When S1 is off, the circuit is normally disconnected, but if it encounters rain, the detector will be short-circuited. At this time, the 2 pin is connected to the ground. The voltage of the 2 pin is 0, less than 1/3Vcc, the timer is triggered, the output voltage 3 feet point becomes high, the LED light is illuminated, T1 is turned on, the relay RL1 is turned on, and the wiper is turned on. The motor, the wiper starts working. On the contrary, after the rain stops, the 2 feet are disconnected from the ground, the 2 feet are restored to the high position, and the wiper automatically stops. Therefore, the smaller the detector spacing, the more sensitive the wiper.
Automatic control circuit for automobile wiper
WARNING!
Do not plug two or more meters together!
IMPORTANT
Don't plug in an appliance where the load exceeds 16 Amp. Always ensure the plug of any appliance is fully inserted into the meter outlet. If cleaning of the meter is required, remove from mains power and wipe meter with a dry cloth.
KEYBOARD DEFINITION
1). SET: Set price with button UP.
2). MODE: Exchange display state.
3). UP: Set price combined with button SET.
GENERAL FEATURES
1).Display line power.
2).Display and memory accumulative total power quantity.
3).Display and memory total power charge of price.
THE DATA DISPLAY
Press MODE button the data displays as follows:
W →KWh →PRICE →COST/KWH
↑_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _↓
1). Plug in socket and power on, the meter will display real power.
2). Press MODE button once again and release, the meter will display accumulative KWh.
3). Press MODE button once again and release, the meter will display total power charge.
4). Press MODE button once again and release, the meter will display COST/KWH.
SETTING PRICE OF COST/KWH
1). Press SET button during display COST/KWH,the first digital COST/KWH flash, press UP button to set it.
2). Press SET button once again and release, the second digital COST/KWH flash, press UP button to set it.
3). Press SET button once again and release, the third COST/KWH flash, press UP button to set it.
4). Press SET button once again and release, the fourth COST/KWH flash, press UP button to set it.
5). Press SET button once again and release, the radix point COST/KWH flash, press UP button to set it.
DATA CLEAR
Press and hold MODE button for 5 seconds will clear KWH,PRICE and COST/KWH data.
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