文件列表:

debt counter photos.zip (709647, 2000-06-16)
debt pcb v13.zip (390194, 2000-06-16)
debt pic hitech c code v23.zip (16842, 2000-06-16)
debt visual basic v23.zip (21591, 2000-11-13)

Hi, This project is the complete design documentation for a large digit debt counter. It was commissioned for the Students association at Canterbury University, Christchurch, New Zealand. It is 8 foot long with 12 digits, each a foot high, and it counts up the debt that the students have. It is still working beautifully to this day. There are several interesting things about the PIC 16F876 micro code in Hi-Tech C: 1. Example of serial comms, plus supporting Visual Basic v5 and v6 project. 2. Example of delay routines, maths routines, etc. 3. Multitasking system. Its keeping a record of the count in the background, while checking the serial lines for comms, updating the display using the shift registers, doing PWM to control the brightness, etc. The system allows multiple tasks to be run based on a timer tick. Each task executes at a selected frequency, and priority. Large tasks can be run in the background, triggered from the interrupt. The counter is still working beautifully to this day - the design is complete, but I take no responsibility for the lack of documentation or clarity in this project. The techniques used for the PIC side of the project are explained in detail in the Hi-Tech C FAQ, http://www.workingtex.com/htpic Cheers, Shane Designed by Shane Tolmie. Freely distributable. Questions and comments to shane@keyghost.com

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