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Recent content by RichardMid

  1. RichardMid

    Interface webcam to DSP

    Hi I am still around even though I do post very frequently any more because the nature of my work changed to a higher level integration. Regarding the interfacing of the webcam... I decided not to use the webcam in the end because of time constraints. I got hold of a different camera which had...
  2. RichardMid

    Serial vs Parallel

    The maximum discharge rate is estimated at 10A. I cannot get the internal resistance of any of the batteries I am considering... I think that the difference in internal resistance between the different batteries will be small enough not to cause any major concerns, but I need to get samples in...
  3. RichardMid

    Serial vs Parallel

    I have a system that requires 600Ah at 12V. I have done some serious battery shopping, and found two options: 1.I can either use four 6V330Ah batteries, and connect two sets of in series and those two in parallel or 2.I can connect four 12V230Ah batteries in parallel. The 2nd setup will be...
  4. RichardMid

    Detection OF DTMF signals

    I found the VTS and VTD commands in another AT command set table. They were not in the table I used initially :( . It looks like that is what I am looking for. I will try it and come back to you Thanks Richard
  5. RichardMid

    serial comms/DTMF generation

    I have two questions: I want to transmit data using the serial port in a C# app, but I cannot find anything inside C# to do it. How can this be done? I want to generate DTMF tones using a modem connected to the pc. What will be the most appropriate way of doing this? Can this be done using the...
  6. RichardMid

    Detection OF DTMF signals

    I have another question concerning DTMF and modem: I want to dial a nr using DTMF, and the transmit data using DTMF to a unit that can decode it. Can I do it using the AT command set? What command do I use? Otherwise what will be the most appropriate way? I am doing all this from a C# app.
  7. RichardMid

    RF PCB layout

    Thanks for the replies, it is exactly what I was looking for. Just one more grey area: I thought of using one side as ground plane, but what do I do with through hole low frequency components which will be present for oscillator tuning. Should I just leave a patch out of the grond plane with...
  8. RichardMid

    RF PCB layout

    Hi all I am modulating a signal up to 433MHz. I am forced to use through hole components like regulators and variable resistors, and then of course the surface mount high frequency components. I would like to know if it will cause trouble if I use the RF and IF components on the same PCB...
  9. RichardMid

    RF mixing

    I have read up quite alot, but I cant seem to find anything that will answer my questions. I might have put the question wrong. I would like to mix the signal up. Obviously I need a mixer with a local oscillator, but will one mixer be sufficient? How do I know whether I should use more than...
  10. RichardMid

    RF mixing

    Firstly, how do you go about mixing a 20kHz signal up to 433Mhz? I am modulating the data at low frequency, and would like to mix it up to 433MHz. Secondly what oscillator is good at such high frequencies. I am looking at a DRO. Is there anyrhing else I should consider? At the receiver side I...
  11. RichardMid

    Stealing signal

    Hi I have been struggling for a while now to get my webcam to work while not attached to a pc, but to a DSP. I have to do this for a project, but can't figure it out. The webcam needs some or other initialization and probably a timing signal to operate. Somehow, I have to capture the...
  12. RichardMid

    Interface webcam to DSP

    Hi I have been struggling for a while now to get my webcam to work while not attached to a pc, but to a DSP. I have to do this for a project, but can't figure it out. The webcam needs some or other initialization and probably a timing signal to operate. Somehow, I have to capture the...
  13. RichardMid

    Video compression on DSP

    I have to implement compression on a video stream taken by a webcam on a digital signal processor(motorolla or TI). It only runs at 1 frame every 5 seconds, meaning real time compression is not necessary. I want to know which algorithm will be best to use? I have thought of taking each frame...
  14. RichardMid

    PIC programmer(picstart plus, atmel)

    No, but according to there site it is not supported. I was hoping somebody will now of some third party software that can do this.
  15. RichardMid

    PIC programmer(picstart plus, atmel)

    Hi I have access to a Microchip picstart plus pic programmer, but I need to program atmel 89c2051 pics. Can this be done. I would think one can get software capable of doing this somewhere, but cannot seem to find any. thanks Richard
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