Electronic Projects


Posted on Feb 5, 2014

This program includes circuit design cad, simulation, and auto routing PC layout. I also use PSPICE at Unisys which has more capabilities but costs 6 times as much and needs to be renewed yearly. With these requirements in mind, and some others, I decided on a variation of National Semiconductors `Micro Wire`(TM). In general this is called a `bit


Electronic Projects
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serial" interface. The interface is composed of shift registers connected in series. Each port is in a chain. Data bits are sent down the chain through the shift registers for output. Input data bits are similarly sent down the chain to be inputted into the computer. My standard bit serial I/O consists of 6 wires. The wires for the standard version use an RJ11-6 6 conductor flat telephone type cable. I also have a simplified 4 wire version. This 4 wire version is predominantly used for output devices only. Pins 5 and 6 are not used. This version eliminates the data input channel and has no self powering capability. RJ11-6 Interface Data Input RJ11-6 Printer Port Adapter RJ11-6 Loop Through Connector. View from the Cable side View from the Cable side When choosing or building the cables that connect the computer and I/O boards together make sure they are the strait through type. In other words the cable has NOTWISTS in it. Terminator Bring the strobe line high and then low. The strobe line does double duty. It latches the output data into the output registers and drivers. It also clocks input data into the input shift registers that will be shifted in later. The first input bit is already present on the computer serial data bit input line. I needed to drive satellite dish type actuators for positioning components of my heliostats. I decided to design the interface such that it drives the most common, read cheap, types of...




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