Article
CANopener
This project was stimulated by a recent series of CAN bus articles in Elektor Electronics. One of the articles in the series included a constructional project (pages 20–24 in the November 1999 edition), which described a CAN bus interface. This construction project is based on that article.At the fastest data rate of 1 Mbits/second the maximum bus length is 40 metres, whilst at the slowest speed of 50 kbits/second, the bus length can extend up to 1000 metres (1 km).
Materials
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
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PCB
Component list
Resistors:
R1,2 = 3k?9
R3= 120?
Semiconductors:
D1 = LED, 3mm, high-efficiency, red
D2 = LED, 3mm, high-efficiency, green
IC1 = PCA82C250
Miscellaneous:
K1 = 9 way sub-D male connector (plug), PCB mount version
J2 = 9 way sub-D female connector (socket), PCB mount version
JP1 = 2-way 2.54 mm pin strip and jumper
R1,2 = 3k?9
R3= 120?
Semiconductors:
D1 = LED, 3mm, high-efficiency, red
D2 = LED, 3mm, high-efficiency, green
IC1 = PCA82C250
Miscellaneous:
K1 = 9 way sub-D male connector (plug), PCB mount version
J2 = 9 way sub-D female connector (socket), PCB mount version
JP1 = 2-way 2.54 mm pin strip and jumper
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