This link has been bookmarked by 14 people . It was first bookmarked on 02 Mar 2006, by Joel Liu.
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04 Aug 06
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10 Jan 06
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The ADC communicates with the parallel port using the SPI (Serial Peripheral Interface) protocol. SPI can be used to talk to a whole range of integrated circuits such as EEPROMs and microprocessors, so you may find the SPI part useful for other projects. In our simple ADC-to-Parallel Port circuit, shown in Figure 1 , there are five wires connecting the ADC to the parallel port. They include DIN, SCLK, DOUT, SSTRB, and CS. Together they are used to to establish fast and flexible communication. For more information about SPI refer to the MAX186 datasheet .
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Interfacing an Analog-to-Digital Converter (ADC) with Linux via the parallel port is fairly simple. There two major areas that need to be addressed - hardware and software. The hardware consists of the parallel port, an ADC, and an analog signal source. The software we programmed in 'C' language.
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It can be a little expensive to read analog signals, for example temperature readings or light levels, into your computer. In this article we will show you (1) how Linux can use a computer parallel port and a $10 integrated circuit to read 8 analog channels at 12 bit accuracy, and (2) how we used this to build the Extreme Comfort System (ECS.)
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23 Dec 05
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22 Dec 05
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It can be a little expensive to read analog signals, for example temperature readings or light levels, into your computer. In this article we will show you (1) how Linux can use a computer parallel port and a $10 integrated circuit to read 8 analog channels at 12 bit accuracy,
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