1 2 Previous Next 19 Replies Latest reply on Apr 8, 2012 5:04 AM by kartik.mankad

    how to interface webcam with PSoC 3

    amit.asnani

      i want to interface a webcam with PSoC 3 and then transmit the webcam video to recevier side..how can i do this..

        • 1. Re: how to interface webcam with PSoC 3
          udayan.umapathi

          What kind of webcam are you trying to interface with PSoC3. USB?

          • 2. Re: how to interface webcam with PSoC 3
            amit.asnani

            actually in my project i want to transmit video to other end ( receiver) wirelessly..  This video will be captured by a webcam and i will be using PSoC 3 at both transmission and receiving end.

               

            ya i will connect webcam to PSoC with USB.. Please guide me with all considerations and your suggestion that i should take...

            • 3. Re: how to interface webcam with PSoC 3
              udayan.umapathi

               I dont think it is possible to connect a webcam to PSoC3 or PSoC5 via USB. PSoC does not have a USB Host capability and hence a USB cam(assuming the camera is a USB perihperal) can not be connected via USB. 

                 

              Assuming that it is connected video over USB is tough because we are fundamentally limited by the bandwidthe available on USB; PSoC3/PSoC5 support only Full Speed transfer and a maximum of around 1 Mega Byte/Second. So even if you have a 1Mega Pixel camera, you wil have approximately 3 Megapixels of data in one frame and depending on the framerate you will have more data. So connecting awebcam to PSoC3 and streaming video via PSoC3 is out of question.

              • 4. Re: how to interface webcam with PSoC 3
                udayan.umapathi

                 That said, Cyoress makes some awesome chips which can do this. There are specific USB devices which can do this, will gather more information and post it here.

                • 5. Re: how to interface webcam with PSoC 3
                  amit.asnani

                  so it means we cannot connect a webcam with PSoC through any other means also....

                  • 6. Re: how to interface webcam with PSoC 3
                    udayan.umapathi

                    Your best bet would be to find if there is someother camera which can throw out data on a different protocol. SPI or may be some other parallel bus would definitely help.

                    • 7. Re: how to interface webcam with PSoC 3
                      amit.asnani

                      Sir, my project is "Wireless Video transmission through Webcam" in this i need to transmit video of a camera from one end to other without a physical connection between them....please guide me how sholud i proceed....

                      • 8. Re: how to interface webcam with PSoC 3
                        user_1377889

                        First, before decide for PSoC 1, 3 or 5

                           

                        To transmit (any) data you need something named "Protocol". It specifies in which format etc what data is transmitted. When you lean on the OSI-layer model (ask mrs. Wiki Pedia if you don't know it), you see that the lowest layer actually defines the transmission media, which is in your case RF. 

                           

                        Give that layer-model a bit of thought, it will make the implementation easier. Later on the protocol-layer will be implemented on your PSoC.

                           

                        You must give attention to bandwidth and byte throughput because uncompressed video has a lot of data and compressing is not an easy job. So sharpen your pencil, thake a sheet of paper and start calculating...

                           

                         

                           

                        Happy number-crunching

                           

                        Bob

                        • 9. Re: how to interface webcam with PSoC 3
                          udayan.umapathi

                          In my opinioin, there are 2 pieces that form this puzzle. First, trying to get data i to PSoC from a webcam(a camera in general). Second is the transmission part.

                             
                                
                          1. As far as, getting the data from video camera is concerned, you need to zero in on what camera you will be using and what will be the protocol used for reading data from camera. Any electronic device uses electonic interfaces such as SPI, USB, PCIE to communicate with other devices. The readily available communication interface with PSoC are SPI, USB, CAN, UART. You need to choose a camera which can provide a standard communication interface mentioned earlier. Even if you choose a cmaera that puts data on a custom interface(may be serial or parallel interface), you need to see if  it possible to implement it in PSoC using UDB logic(you ccan come back to the forum to get this answered). The limtation on the communication protocl will be the data throughput. If you consider a 1 Megapixel camera, as explained in the previous post you will have 1Million*3 bytes of data per second(3 Meg Bytes per second). Based on the resolution you need and based on the communication interface you need to select a camera and assess the feasibility.
                          2.     
                          3. Wireless interface: There are many readily available wireless modules that have enough bandwidth to support video transmission. Again, PSoC needs a communication protocol to talk to the wireless module. 
                          4.    
                          • 10. Re: how to interface webcam with PSoC 3
                            amit.asnani

                            If using a digital webcam....wat are the types of formats  video webcam available like RGB or such.......or which can be interfaced with controller...

                            • 11. Re: how to interface webcam with PSoC 3
                              amit.asnani

                              Finally i have come to conclusion to have video transmission between two laptops. I have divided my project in 2 parts.

                              Part 1. In this i am transferring the already present video in my laptop (transmitter) which is connected to PSoC board to another laptop (receiver) connected with another PSoC board and show the video. To send video from laptop to PSoC board i am thinking to have serial communincation using RS232.

                              Part 2. In this i am thinking to use the webcam of transmitter side laptop to capture the video and show it on the receiver laptop with live streaming.

                              So guide me with this process how i can proceed. Also how can i transfer video file to PSoC board using RS 232.
                              Thank you...

                              • 12. Re: how to interface webcam with PSoC 3
                                user_1377889

                                The question of bandwidth is still not quite answered. The maximum baud-rate for a PC is about 56kbit/s.

                                   

                                To establish a connection you need a level-shifter (Max232) from +-12V to 5V and vice-versa. Within the PSoC3 Creator 2.0 software you'll find an easy-to-use UARTuser module (you may use more than one). Have a brief look at the module's datasheet to apply the right settings, drop a few lines of code and your'e done.

                                   

                                 

                                   

                                Happy coding

                                   

                                Bob

                                • 13. Re: how to interface webcam with PSoC 3
                                  kartik.mankad

                                  Well,

                                     

                                  I'd like to draw attention to a fantastic project out there,the CMUcam4,which I think can do what you require.Interfacing that to the PSoC will also be very simple.

                                     

                                  cmucam.org/projects/cmucam4/

                                     

                                   

                                     

                                  And if your goal is not directly realtime video,you could also consider a JPEG TTL camera,like this one

                                     

                                  Sparkfun link - www.sparkfun.com/products/10061

                                     

                                  Interfacing is super simple,only UART.

                                  • 14. Re: how to interface webcam with PSoC 3
                                    kartik.mankad

                                    A good tutorial from Adafruit on the same type of camera,linked here www.ladyada.net/products/camera/

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