Sort of to do with EFI (more electronics)

dzorde dzorde at geocities.com
Thu Oct 23 08:01:00 GMT 1997


My understanding is that the sensor (in most cases) is just used to make up
a voltage divider, scale the other resistor correctly and you could
technically connect directly to the ADC.  Although I'd suggest a bit of
filtering and probably an op-amp before the ADC.

Dan     dzorde at geocities.com

>Hi,
>The following email is about A-D conversion of inputs from various
>sensors. It's not really about EFI (sorry) but as some of
>you may know the answer, I post it here :o)
>
>I am in the process of making a digital data-logger which uses an 8051
>(similar) with 6 channel A-D conversion on chip. All seems to be ok. I
>have the LCD, a PIC 16C55 controller board interfacing to RS232 that all
>works ok. Now, the quest is to interface it to the real world. In
>researching this, I have decided to use 80C550 or 87C748. There is no
>reqirement in the design to use a serial link, so they should be ok.
>The questions I have are;
>    The oil temperature, water temperature, oil pressure sensors use
>what range of voltage? It is my understanding that they ground a "12V"
>signal and the resulting current flow is used as the measure of sensor
>range. Is this true for all the sensors?
>If you know about A-D conversion, I am stuck at this point not being
>able to interface the 8051 family A-D converter to the real world. ( I
>am a computer engineer, I know a little about digital electronics, but
>obviously lack quite a bit in this area )
>    I found a great site www.8052.com that gives many details about the
>chip, interfacing and programming. At the moment, everything to do with
>the 8051 seems to be sorted out except for the Analogue part!
>
>I would appreciate any help or suggestions, if you are interested in the
>project, it is no top secret, so I would be pleased to share more
>details with you.
>
>Thanks in advance
>Tim Freeburn
>
>
>
>




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