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  • Users: RichardMid
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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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
  9. RichardMid

    ISM frequency bands

    Where can I get more information and regualtions concerning the ISM frequency bands in South africa? Which commitee controls this?
  10. RichardMid

    Wireless transmitters and antennas

    I'm stepping into a project that I have no previous experience in. I am needed to build a low-cost, easy to implement system that, almost like a surveillance camera system, has multiple low quality streaming video as input, which has to be coded, compressed, and transmitted over a wireless...

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