Shift register interfacing with pic micro controller

[varunme]

Anybody help me with a PIC micro shift register schematic ? ,
How can we make the PWM in the output from the shift register ?
I have to interface so many LEDs and sensors to my PIC , so I have to use a multiplexer and the intensity also to be controlled

 

[horace1]

how many LEDs? had a similar project proposal several years ago with 10000 LEDs
built a prototype with each LED color and intensity controlled by a PIC16 using PWM - data was shifted into the the PIC16s by a PIC32

 

[thannara123]

what you exactly need please tell more
it will help others to answer in this threads

 

[varunme]

I want to make , PWM controlled light's prototype , which switch on and off after 6pm , when someone is there, it should glow at 100%, otherwise it should be 50%.

---------- Post added at 23:49 ---------- Previous post was at 23:47 ----------

want to interface 15 LEDs .

 

[horace1]

if all the LEDs are the same intensity you could use a single microcontroller using PWM with a drive circuit of the required power for the LEDs

what is the power of the LEDs?

 

[varunme]

But its like in a street light , if a person comes near it the LED glows its full bright , means i have to control each seperately
7W LEDs

 

[horace1]

sounds like you need 15 boards each with a microcontroller, motion detector, LED, etc. e.g.
Motion detection alarm using a PIR sensor module with a PIC Microcontroller :Embedded Lab

 

[varunme]

How many PWM pins , the 16F877a have ?

 

[horace1]

the 16F877a has 2 PWM, see
PIC16F877A

some PIC16s have more, you can see the PIC16 family on
PIC16 MCU - Product Family - 8-bit Microcontrollers

click on the device link to see full details

in addition to using hardware PWM you can drive digital IO pins using a software PWM algorithm (as in the days before microcontrollers had hardware PWM)

 

[varunme]

can we get a single chip PWMs other than ucs ?