Hello guys,
I have a car wiper control system to be made, which will be controlled by + and -, the speed should be displayed on the screen. There is not a rain sensor in the system. Would anyone be able to help with the digital schematic?

 

You want too many things ........ now You have none .........

What type of "screen" will the Speed be displayed on ?

How will You get a Speed-Signal from the Motor ?

Will this be used in a Car, or in a different project ?

A standard PWM Circuit can control the Speed with a Control-Voltage,
or a Pot with a Knob inside the Car, or elsewhere, if not used in a Car.

But, You will need to gut the existing Circuit-Board from the Gear-Box and identify the Motor-Wires,
and if it is actually going to be used for Car-Windshield-Wipers,
the Parking-Switch-Connections must also be identified.
The Parking-Switch may be built-in to the existing Circuit-Board, which may complicate matters.
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Is this Home work?
Cheap enough to go to a auto wrecker and pick up the mechanism, includes the reversing, as usually the motor only runs in one direction.
Generally you really only need two speeds unless this is a off-car application.
On Automotive versions, the wiper motor utilizes three brushes to achieve the two speeds.

 

I know this is of no help to the TS question, but why on earth would anyone need the windshield wipers speed displayed on the car dashboard or where ever TS wants it displayed?