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).

Resistors:
R1,2 = 3kΩ9
R3= 120Ω
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