SparkFun Electronics Commentsurn:uuid:214d0e4e-f1b1-d287-ce26-ac5b4c9f82492024-03-28T08:10:56-06:00SparkFun Electronicssantaimpersonator on DEV-14483 - SparkFun AST-CAN485 Dev Boardsantaimpersonatorurn:uuid:f8465bac-f659-018c-01e1-76b840741cdb2020-05-27T10:55:46-06:00<p>Hi there, it sounds like you are looking for <a href="https://www.sparkfun.com/technical_assistance" rel="nofollow">technical assistance</a>. Please use the link in the banner above, to get started with posting a topic in our <a href="https://forum.sparkfun.com/" rel="nofollow">forums</a>. Our technical support team will do their best to assist you.</p>
DougCoutts on DEV-14483 - SparkFun AST-CAN485 Dev BoardDougCouttsurn:uuid:623222d8-20d5-1527-89fc-c82ea29b4e112020-05-17T10:43:25-06:00<p>I almost completed a project with three of these boards when I started to run into problems uploading code. I decided to reinstall the bootload so I connected an AVR Pocket Programmer and entered a commend line avrdude -c usbtiny -p c128 -F
I am getting back "avrdude: Device signature = 0x000000" (not "ox1E9781" as expected for the AT90CAN128 I have checked the connections probably a dozen times.. based on the pin outs shown for the programmer and CAN485. Are my units toast or is there something else I can try?</p>
Customer #1563622 on DEV-14483 - SparkFun AST-CAN485 Dev BoardCustomer #1563622urn:uuid:d65d8a7e-a229-f857-7083-a16890acc2332019-12-06T04:07:13-07:00<p>For RS485, please note that the A/B markings on the PCB and in the datasheet corresponds to the transceiver A/B notation, which is the opposite of the RS485 standard A/B notation. In other words, "A" on the PCB is actually "B" and vice versa.</p>
Customer #699398 on DEV-14483 - SparkFun AST-CAN485 Dev BoardCustomer #699398urn:uuid:05fc926d-3d38-c0d1-c652-38c57c6ebac02018-08-13T02:44:22-06:00<p>I was intending to use this for interfacing with a high speed RS485 bus (2Mbps) but it looks like the board can't handle that. The output waveform on the RS485 chip is al wonky. Apart from that, this is a great board!</p>
almeerow on DEV-14483 - SparkFun AST-CAN485 Dev Boardalmeerowurn:uuid:50d1ddfd-1c4f-7b1f-c36b-b6d8643845b32018-04-06T16:50:53-06:00<p>I can't make external interrupts work. None of pins are responding. Same sketch works on Uno (on pin 2). Any ideas?<p>EDIT: It looks like Arduino functions manipulate wrong bits in wrong registers in attachInterrupt(). Directly setting EICRA and EIMSK registers works and it does support CHANGE interrupts.</p></p>
mud329 on DEV-14483 - SparkFun AST-CAN485 Dev Boardmud329urn:uuid:22dd1d63-b241-b1f3-53fc-d430300ae5312018-03-16T05:28:58-06:00<p>Yes, an accy circuit would be ideal but where I have to package and connect this thing there are only CAN lines and B+/ground. So unless there is a wake on CAN I would not be able to put this in low power mode, hence risking battery drain.</p>
Alex the Giant on DEV-14483 - SparkFun AST-CAN485 Dev BoardAlex the Gianturn:uuid:7d95c008-69bd-af93-c131-1fc1389f56202018-03-14T08:45:17-06:00<p>I'm not sure if there's a CAN bus interrupt to wake the micro, but you can always use the OBD-II port (if your car is newer than 1996) and use the accessory 12V power (which is only on when the car is on) and regulate the voltage down to 5V.</p>
mud329 on DEV-14483 - SparkFun AST-CAN485 Dev Boardmud329urn:uuid:9f93a9dd-07b3-8e95-a6b3-be0a0e7d6fad2018-03-14T05:43:18-06:00<p>Is it possible to use this board and have it wake on CAN activity? I'm looking for something that can be left connected to a vehicle battery feed, wake up when there is CAN activity and run some code / transmit some CAN messages, then sleep when the vehicle CAN bus goes dormant again.</p>
Alex the Giant on DEV-14483 - SparkFun AST-CAN485 Dev BoardAlex the Gianturn:uuid:917e77a7-57eb-f50c-23ee-59bda57df3612018-03-11T12:59:06-06:00<p>To program it, you’ll need a <a href="https://www.sparkfun.com/products/14050" rel="nofollow">USB to UART Bridge</a> which has a USB micro B connector on it.</p>
Customer #1306993 on DEV-14483 - SparkFun AST-CAN485 Dev BoardCustomer #1306993urn:uuid:0f49e061-aac6-91af-fe35-b885dcb193892018-03-11T12:49:49-06:00<p>This is ALMOST exactly what I need except I REALLY need a micro-usb port for programming? Is there a way to attach a usb port to this? I need the RS485 for its long distance ability.</p>
bboyho on DEV-14483 - SparkFun AST-CAN485 Dev Boardbboyhourn:uuid:ff1fa974-3486-da37-7e5c-eb1f943b91e72018-03-09T10:40:16-07:00<p>Sorry about that, we had to work with AST to turn it on certain repositories. It is live now. =)</p>
bboyho on DEV-14483 - SparkFun AST-CAN485 Dev Boardbboyhourn:uuid:976373dc-4690-1403-97fe-981904a19e252018-03-09T10:40:03-07:00<p>Sorry about that, we had to work with AST to turn on certain repositories. It is live now. =)</p>
Robomaniac on DEV-14483 - SparkFun AST-CAN485 Dev BoardRobomaniacurn:uuid:e0e96612-85b2-fbd0-422d-67994a1211732018-03-02T07:42:38-07:00<p>yes here it is http://ww1.microchip.com/downloads/en/DeviceDoc/doc7679.pdf</p>
Robomaniac on DEV-14483 - SparkFun AST-CAN485 Dev BoardRobomaniacurn:uuid:622d5315-6e7f-5916-be0f-1d17f505ee5c2018-03-02T07:42:13-07:00<p>link to github is this
https://github.com/Atlantis-Specialist-Technologies/CAN485<p>and not the one with admin in it</p></p>
Customer #615978 on DEV-14483 - SparkFun AST-CAN485 Dev BoardCustomer #615978urn:uuid:4783c59d-5853-6d87-3361-d1f52b3a5e1c2018-03-02T05:27:33-07:00<p>Link to the AT90CAN128 datasheet is broken.</p>