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PiCAN-M User Guide
OpenPlotter / Signal K
Installation Guide
January 2021
Product name PiCAN-M with NMEA 0183 and NMEA 2000 Connection
Model number RSP-PICAN-M
Manufacturer SK Pang Electronics Ltd
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Contents
Table of Contents
1.! Introduction ........................................................................................................... 3!
1.1.! Features*.............................................................................................................................................................*3!
2.! Hardware Installation ............................................................................................. 4!
1.2.! NMEA*2000*CAN-BUS*Connection*.........................................................................................................*4!
1.3.! NMEA*0183*(RS422)*Connection*...........................................................................................................*5!
1.4.! 120W*Terminator*..........................................................................................................................................*5!
1.5.! LED*.......................................................................................................................................................................*5!
1.6.! Switch*Mode*Power*Supply*(optional)*................................................................................................*5!
1.7.! Qwiic*(I2C)*Connector*J4*............................................................................................................................*5!
3.! Software Installation .............................................................................................. 6!
1.8.! Installing*CAN*Utils*.......................................................................................................................................*9!
1.9.! Bring*Up*the*Interface*.................................................................................................................................*9!
4.! Starting OpenPlotter ............................................................................................. 11!
1.10.! Configure*GPS*NMEA*0183*(RS422)*...................................................................................................*11!
1.11.! Configure*I2C*for*BME280*Sensor*.......................................................................................................*17!
1.12.! Configure*NEMA*2000*...............................................................................................................................*23!
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1. Introduction
This!is!a!PiCAN-M!with!NMEA!0183!and!NMEA!2000!Connection.!The!NMEA!0183!
(RS422)!is!via!a!5!way!screw!terminal.!The!NMEA!2000!is!via!Micro-C!connector.!
Extra!sensors!can!be!connected!via!the!Qwiic!(I2C)!connector.!
Optional!3A!SMPS.!The!12v!from!the!NMEA!2000!network!can!be!use!to!power!the!
PiCAN-M!and!the!Raspberry!Pi.!
Easy!to!install!SocketCAN!driver.!Programming!can!be!done!in!C!or!Python.!
1.1. Features
• CAN!connection!via!Micro-C!connector!
• 120Ω!terminator!ready!
• SocketCAN!driver!
o appears!as!can0!to!application!
• NMEA!0183!(RS422)!via!5-way!screw!terminal!
o appears!as!ttyS0!to!application!
• LED!indicator!(GPIO22)!
• Qwiic!(I2C)!connector!for!extra!sensors!
• Optional!3A!SMPS.!!
• Compatible!with!OpenCPN!and!Signal!K!!
!
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J1#
Function#
1!
Shield!
2!
+12v!
3!
GND!
4!
CAN_H!
5!
CAN_L!
2. Hardware Installation
Before!installing!the!board!make!sure!the!Raspberry!is!switched!off.!Carefully!align!
the!40way!connector!on!top!of!the!Pi.!Use!spacer!and!screw!(optional!items)!to!secure!
the!board.!
!
1.2. NMEA 2000 CAN-BUS Connection
The!CAN-bus!connections!are!made!via!J1!a!5!pin!Micro-C!connector.!
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J3#
Function#
1!
GND!
2!
IN!+!
3!
IN!-!
4!
OUT!-!
5!
OUT!+!
!
1.3. NMEA 0183 (RS422) Connection
The!NNEA!0183!(RS422)!connection!are!made!via!J3!a!5way!screw!terminal.!
!
!
!
1.4. 120W Terminator
There!is!a!120W!resistor!fitted!to!the!board.!To!use!the!terminator!solder!a!2way!
header!pin!to!JP1!then!insert!a!jumper.!
1.5. LED
There!is!a!red!LED!fitted!to!the!board.!This!is!connected!to!GPIO!22.!
1.6. Switch Mode Power Supply (optional)
This!is!an!optional!5v!3A!module!that!can!power!the!Pi.!It!has!an!input!voltage!range!
of!7v!to!24v.!
!
1.7. Qwiic (I2C) Connector J4
J4!is!a!Qwiic!(I2C)!connector.!The!I2C!bus!can!be!use!for!extra!sensors.!
!
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3. Software Installation
If!you!want!a!simple!installation!of!OpenPlotter!/!Signal!K!then!use!a!pre-configure!SD!
image!instead.!!
Download!the!2020-12-16-OpenPlotter-v2-Starting-img.zip!from!
https://cloud.openmarine.net/s/sL9doDML7P4CQDo!
Download!and!install!Raspberry!Pi!Imager.!
https://www.raspberrypi.org/software/!
Put!a!SD!card!in!a!reader!and!start!Raspberry!Pi!Imager.!
Click!Choose!OS.!
!
Then!click!Use!custom.!
!
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!
Select!the!zip!file!you!have!just!downloaded!and!click!CHOOSE!SD!CARD.!Select!your!
SD!card!and!click!WRITE.!
!
Once!the!SD!card!write!has!finished!remove!it!from!your!PC!and!insert!into!the!
Raspberry!Pi!and!power!up.!
!
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The!first!boot!will!take!some!time.!You!can!set!new!password!and!system!language.!
Next!we!need!to!add!entries!to!config.txt!
Start!a!new!terminal!and!add!the!overlays!by:!
sudo nano /boot/config.txt
Add!these!lines!to!the!end!of!file:!
enable_uart=1
dtparam=i2c_arm=on
dtparam=spi=on
dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25
dtoverlay=spi-bcm2835-overlay
Press!CTRL-x!to!save!and!exit.!
Next!we!need!to!configure!the!UART!by:!
sudo raspi-config
Select!5!Interfacing!Options,!P6!Serial!
“Would!you!like!a!login!shell!to!be!accessible!over!serial!?”!Select!No.!
“Would!you!like!the!serial!port!hardware!to!be!enabled!?”!Select!Yes.!
!
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Select!finish!and!reboot!the!Pi.!
!
1.8. Installing CAN Utils
Install!the!CAN!utils!by:!
sudo apt-get install can-utils
1.9. Bring Up the Interface
You!can!now!bring!the!CAN!interface!up!with!CAN!2.0B!at!250kbps:!
sudo /sbin/ip link set can0 up type can bitrate 250000
Connect!a!NMEA!2000!device!to!the!network!and!start!candump.!
!
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candump can0
You!should!see!something!like!this:!
This*capture*is*from*a*Yacht*Devices*Digital*Thermometer*NMEA*2000*YDTC-13N*
*
To*automatically*bring*up*can0*at*boot*up*we*need*to*edit*the*interface*by*typing*in:*
sudo nano /etc/network/interfaces
Add*these*lines*to*the*end*of*file:*
auto can0
iface can0 inet manual
pre-up /sbin/ip link set can0 type can bitrate 250000
up /sbin/ifconfig can0 up
down /sbin/ifconfig can0 down
*
Press*CTRL-x*to*save*then*exit.*
*
*
*
*
*
*
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4. Starting OpenPlotter
Once*the*Raspberry*Pi*has*booted*up*you*should*see*a*screen*like*this:*
1.10. Configure GPS NMEA 0183 (RS422)
The!NMEA!01832!(RS422)!is!connect!to!the!Pi!on!UART!port.!This!need!to!be!enable!
first.!Connect!a!NMEA!0183!GPS!device!to!the!5!way!green!terminal!plug!like!shown!
below:!
*
!
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On!the!Pi!click!OpenPlotter,!Serial:!
1. Select!ttyS0!
2. Enter!gps!as!alias!
3. Select!NMEA!0183!as!data!
4. Click!Apply!
!
!
Wait!until!the!changes!has!been!applied.!The!configure!the!connection:!
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!
1. Select!Connections!
2. Click!Add!to!Signal!K!
3. Select!Baud!Rate!
4. Click!AUTO.!
Wait!until!Signal!K!sever!restart!and!it!should!look!like!this:!
Now!start!OpenCPN:!
!
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1. Start!OpenCPN!
2. Click!Options!
3. Click!Connections!
4. Click!Add!Connections!
Next!configure!the!new!connections:!
!
!
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1. Select!Serial!
2. Select!ttyS0!
3. Click!Apply!
This!will!take!you!back!to!the!main!Options!dialogue!box:!
!
1. Click!check!box!to!bring!up!debug!window!
2. This!will!show!the!raw!gps!data!received!
3. Click!check!box!again!to!remove!debug!window!
4. Click!Apply!
Sometimes!this!does!not!work.!If!this!is!the!case!close!OpenCPN!go!back!to!the!Serial!
dialogue!box:!
!
1. Select!ttyS0!
2. Click!Remove!
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The!close!the!Serial!dialogue!box!and!open!it!again.!You!should!see:!
Start!OpenCPN!again,!you!should!then!see:!
!
1. GPS!lock!
2. Click!Dashboard!
!
!
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1.11. Configure I2C for BME280 Sensor
The!Sparkfun!BME280!sensor!can!provide!barometric!pressure,!humidity,!and!
temperature!to!the!Raspberry!Pi.!
The!default!address!on!the!board!is!0x77!but!this!gives!a!problem!to!Signal!K!
application.!This!can!be!solved!by!changing!it!to!0x76.!To!do!this!cut!the!track!on!the!
0x77!address!solder!bridge!then!solder!the!bridge!for!address!0x76.!This!will!change!
the!board!address!to!0x76.!
Now!we!need!to!install!driver:!
1. Click!OpenPlotter!
2. Click!Settings!
Now!install!the!I2C!Sensors:!
!
!
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1. Click!Refresh!
2. Select!I2C!Sensors!
3. Click!Install,!then!yes!
Now!start!the!I2C!dialogue!box:!
Now!configure!the!BME280!sensor:!
!
!
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1. Click!Add!
2. Select!BME280!
3. Select!0x77!
4. Click!OK!
Now!we!need!to!add!the!missing!temperature!reading:!
1. Select!temperature!
2. Click!Edit!
3. Click!Edit!
Now!add!the!temperature!key:!
!
!
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1. Select!environment!
2. Select!inside.temperature!
3. Click!OK!
4. Click!OK!
Now!connect!BME280!to!Signal!K:!
1. Click!Connections!
2. Select!BME280!
3. Click!Add!Connection!
Now!open!Signal!K!Dashboards:!
!
!
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Now!open!Instrument!Panel:!
1. Select!Instrument!Panel!
2. Click!Open!
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In!Signal!K!open!Customise!Display!(spanner!symbol)!:!
!
1. Click!Spanner!
!
!
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Now!configure!the!signals:!
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1. Click!Show!on!grid!
2. Click!Edit!
3. Select!unit!to!suit!
4. Click!Done.!Repeat!for!all!3!readings!
5. Click!eye!symbol!
!
!
Now!you!should!see!all!3!readings!on!the!panel:!
!
!
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1.12. Configure NEMA 2000
We!will!a!wind!speed!sensor!and!a!temperature!sensor!from!Yacht!Devices!Digital!
Thermometer!NMEA!2000!YDTC-13N.!
1. Click!OpenPlotter!
2. Click!CAN!Bus!
Now!configure!CAN!bus:!
!
!
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!
1. Click!MCP2515!
2. Select!SPI0!CE0!
3. Click!Add!Connection!
Wait!for!Signal!K!to!restart.!
Check!CAN-bus!traffic:!
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1. Select!SPI0!CE0!
2. Click!Check!device!traffic!
3. Check!there!are!CAN-bus!traffice!
If!you!see!CAN-bus!traffic!that!means!the!board!has!been!configure!correctly.!
Close!candump.!
!
!
!
!
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Open!Signal!K!Instrument!Panel!and!you!should!see!the!NMEA!2000!devices.!
Configure!the!units!as!required.!
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