Download Circuit Cellar October 2010 by Steve Ciarcia Founder Editor PDF

By Steve Ciarcia Founder Editor

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The nice thing is, when you need to do work on a proto board, you just unscrew the four screws and lift it up. That's why we want to use pluggable cables to interconnect multiple boards. The carrier, in addition to being cheap to make, lies flat on the workbench or you can put some cross pieces on each end so it can sit upright. It easily goes out in the field to connect to real equipment and lets you fully test your circuit before committing it to a printed circuit board. Finally, Photo 6 shows the development setup using a cable to connect Mikro's EasyPIC4 development board to my project prototype.

25" to allow cables to pass between them and run under the proto boards. This makes for a less-cluttered prototype and easier-to-connect test probes. TEST POINTS & lEDs I often add test points and LEDs to a microprocessor circuit to aid in debugging, especially at the systems level. Test points give you trigger signals for oscilloscopes, DSOs, and logic 1/0 PORTS I use ribbon cable and 10-pin headers to connect the microprocessor's ports to outlying prototype boards (except for Port E). Each port has its full eight I/O bits, ground, and 5 V.

Note that microprocessor pin numbers are for the 40-pin devices. Refer to the pinout diagram posted on the Circuit Cellar FTP site for the conversion of pin numbers for the 28-pin devices. Although designed for PIC16F8x7 devices (I have a bunch of PIC16F877 devices from past projects), I also designed it for PIC16F7x7 devices, which have an internal oscillator. The two pins used for a crystal or ceramic resonator (the board allows you to use either) are also used as I/O pins for port E. I laid out the board with the same outline as RadioShack's board (see Photo 2) so it can be easily mounted on the same carrier as the prototype boards.

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