RS 422 Compatible Indicator

design of the circuit and coding for the project`s stepper motor controller, the development of the circuit and coding for the speed-controlled DC motor for the project`s propulsion system, the circuit and coding for the system`s navigation system using a MEMS accelerometer circuit. This circuit is a bit of a departure from the rest of the content in this chapter,
RS 422 Compatible Indicator - schematic

inasmuch as the appliance I describe here is not part of the E-2 project. The reason I have included this section is because the circuit and firmware illustrate several relevant and interesting points, including multidrop differential serial communications over relatively long distances and using the AVR`s internal RC oscillator instead of an external crystal. This application also provides a nice example of how the sorts of systems in this book can be used in real-world situations. I developed this device for a shipping center application used in two of a company`s warehouses. The products shipped from these centers consist of standard and customized kits of individually-packaged parts. A number of conveyor belts run through the warehouse area, past the various bins of parts. At the "start" end of each conveyor belt is a large matrix of 416 pigeonholes arranged as 26 rows by 16 columns. Before each shift, administrative staff stock these pigeonholes with pick-lists describing different standard subassemblies. Each pigeonhole has an indicator lamp (actually, an LED) over it. A central computer, connected to the company`s order processing system, controls all these indicator lamps over a piece of Category 5e cable that runs approximately 800 feet from the computer room to the warehouse floor; the indicator panels show workers along the conveyor belt which pick-lists to gather for an individual order as it progresses down the...

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