up down counter

Could anybody let me know the principle how up down counting is done using 2 micro switches or proximity switches. I can figure out the electronics to start counting up or down.
If i have 2 sensors, (proximity or on/off switches) , what is the principle and wiring of the switches , used to make it count the number of turns of the wheel, increasing clockwise and decreasing anti cw . The wheel is hand turned and will have a cam or plate to activate the switch or proximity switch serially or one after the other.
thanks

mabey a pic chip can do what you want.

You need a quadrature detector such as **broken link removed**.

Duplicate thread.

https://www.electro-tech-online.com/threads/up-down-counter.104130/#post849904

see the bellow link for a thread, you can get the idea how it has to be implemented using two swithces or sensors.

https://www.electro-tech-online.com/threads/counter-door.103518/