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    I guess the one thing you guys have found is that...

    I guess the one thing you guys have found is that when designing something always plan on including ways of expanding functionality. It may not be needed but when it is a lot of time can be saved. ...
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    Processing speed cannot be an issue. Encoders are...

    Processing speed cannot be an issue. Encoders are only used occasionally and a test to see if the inputs have changed state is 20-30 uSecs including saving context. Latency introduced by other...
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    Why not allow two inputs to have alternative...

    Why not allow two inputs to have alternative function as encoder ins. In a fast timer interrupt track encoder state changes (do a debounce for mechanical chatter) and inc / dec a counter. The PC...
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    There is a good thread on ...

    There is a good thread on

    http://www.digital-car.co.uk/forum/showthread.php?t=6444&page=2

    about using accelerometers with car PC's
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    OOPs wrong thread

    OOPs wrong thread
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    Because the micro I/O port is also configurable...

    Because the micro I/O port is also configurable as input it will have a protection network to Vcc. So if you use a PNP bipolar device you will still have the problem. Only real solution is to add a...
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    One small point looking at your schematic. The...

    One small point looking at your schematic. The pchan fet will be partly turned on by connecting the the microcontroller pin. The Vgs for the IRFR9024 starts to turn the device on at 4.5volts. The...
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    masch I use the circuit board to input all the...

    masch
    I use the circuit board to input all the signals mentioned to the carPC over the RS232 link (actually uses a serial to USB converter). The idea for the doors, bonnet and boot was to use as...
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    In putting together my car PC I wanted to have...

    In putting together my car PC I wanted to have inputs from battery, temperature, charge / discharge Amp meter for battery as well as the doors, lights and handbrake. There have been a few designs...
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    Also having problem with other USB devices...

    Also having problem with other USB devices causing the audio to break up. As I have the radio stick next to the PC card I have hardwired the audio to the aux in connector.

    Remove R2 and R3 (this...
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    Not too difficult to get it to work reliably...

    Not too difficult to get it to work reliably detecting distance. Main problem is range varying (have not had time to look at this further). The minimum distance is the result of an auto calibration...
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    The PDF has a circuit for 2 channel ultrasonic...

    The PDF has a circuit for 2 channel ultrasonic ranger that I use.

    It works but needs a few improvements. Accuracy is about 5% . On detecting the car going into reverse serial command is sent to...
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    Did you remember to invert the data coming out of...

    Did you remember to invert the data coming out of the port pin. The MAX232 inverts data.

    Madmac
  14. Would be good to post it somewhere. Been trying...

    Would be good to post it somewhere. Been trying to download and link is so slow download always times out.

    Madmac
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    As STARFOX says check the pinout. the 2n3904 is...

    As STARFOX says check the pinout. the 2n3904 is manufactured with 2 variants depending on manufacturer.

    The other detail to remember is the 8051 ports go to 'ff' when the part is reset, this will...
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