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lmit switch and motor drive circuit

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mohdsalim

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limit switch and motor drive circuit

hello all,
i have a circuit i need to understand it. its for my project. it is used to control DC motor and a servo motor. also used to control limit switch using contact method. am building a robotic arm which will detect different materials and distinguish them from each other, placing one in the east, one west and the last in the south. i want to place the limit switches on the base, one in the east, one west, one south and last at the default position of the robot which is north. i got the circuit diagram here motor drive circ.png. can anyone explain to me the working of the limit switch circuit. thanks
 

The 4 switches are connected to the 4 I/O ports of the microcontroller.

The default state of the switches are HIGH thru the VCC and you have a logic 1 at the input of the controller.
When the switch is activated it gets connected to the GND and you have a logic 0 at the input of the controller.
You also have an LED indication whenver the switches are in default(HIGH) state.

Is this what you were looking for. That's pretty understood by the drawing itself.
 

yeah, thats understood. what about the the single limit switch connected up? and Q6 connected with the two capacitors to the PIC which is in between the four limit switches?
thanks
 
Last edited:

mohdsalim said:
what about the the single limit switch connected up?
Click to expand...

This is just another switch connected to the input of the mcu, no one can tell you what is does unless you provide the code of the pic,
it can be anything.

mohdsalim said:
and the two capacitors with connected with Q6 to the ground in between the limit switch circuit?
Click to expand...

I can't see a Q6 but i assume that you refer to the crystal oscillator, this is the clock of the mcu, the crystal needs these 2 capacitors to work.

Alex

P.S. your schematic is small and becomes very blurry when I zoom, i can barely read the components.
 
Last edited:

can you please post a better picture of the circuit, it is very small and not able to read anything. Isn't it a crystal in between the 4 switches.? pls update your attachment.
 

thanks a lot. yeah it is a clock Q6. i have been looking for the reoson of including the extra limit switch but not to find it. i havent started doing the programming part yet.
about posting the diagram, that is the best i can do given the circuit diagram i have. if you ever wanted the circuit i can send it to you via mail.
thanks all
 

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