MCP2551 and MCP2515 or just MCP2551?

[antimodular]

Hi

I was wondering if you quickly could clarify the hook of the MCP2551 to the Teensy.

The Arduino libraries i have found seem to work on SPI and need MCP2551 and MC2515 together. As per this schematic: http://cdn.sparkfun.com/datasheets/Dev/Arduino/Shields/SparkFun_CAN-Bus_Shield_v13a.pdf

Does you library only need the MCP2551and needs it's CANL and CANH pins connected to the teensy?

Thanks, Stephan

[riodda]

you will need a transcriever between the teensy and canh canl lines

[antimodular]

do you have a suggestion which transceiver chip i should use or a link to a sample schematic? the MC2515 on the spark fun board is a SPI chip, so not the right thing to use.

thanks.

[riodda]

i use ti svn chip like http://www.dx.com/p/bus-transceiver-sn65hvd230-can-communication-module-blue-385988#.Vsys8cvUUqI

you will have to follow this schematic for wiring

https://upload.wikimedia.org/wikipedia/commons/9/9e/CAN-Bus_Elektrische_Zweidrahtleitung.svg

[antimodular]

oh i see. i am already using the MCP2551 (which you refer to as the transceiver). so i am good to go i guess. i just wanted to make sure i am not missing some other electronics.

my goal is to have multiple teensy's talk to each other via the CAN transceivers.

[riodda]

yes, you are got to go, can rx and tx will go to teensy can pins, tx to tx rx to rx, just remember about the termination of the bus

[antimodular]

great.

one last question. the CanTest example that comes with the github download, should i upload that to both teensys or would the echo node need a different sketch?

thank so much for your help.

[riodda]

chanche just line 85 to avoid the 2 nodes send on the same id

[antimodular]

great thanks again. i ended up using this receiver and sender test code: http://www.mikrocontroller.net/topic/370955#4189341