Dual CANbus monitor and instrumentation cluster

Eagle Schematic and Board design

/media/uploads/TickTock/canaryr5.zip

/media/uploads/TickTock/sch_r4.jpg /media/uploads/TickTock/lcdsch.jpg /media/uploads/TickTock/brd_r4.jpg

Parts List

qtyinstancepart #packagesupplierDescription
1BAT3Vhttp://www.ebay.com/itm/10x-CR2032-SMD-Battery-Holder-for-CR2032-Battery-/180938057979?pt=LH_DefaultDomain_0&hash=item2a20bfa8fbLithium 2032 coin battery holder
4C1-C4ECST1DC106R6032Tantalium capacitor 10uF
3FC1-FC3ZF1-20-01-T-WThttp://www.samtec.com/cable-systems/idc-ffc/ffc/zero-insertion.aspx20 conductor 1mm pitch flex cable connector (optional)
1FJ-20-R-08.00-4http://www.samtec.com/cable-systems/idc-ffc/ffc/zero-insertion.aspx8\" 20 conductor 1mm pitch flex connector, end reversed (optional)
2H1-H4(DON'T populate H1-H4 headers - solder mbed directly)
1H5http://www.ebay.com/itm/221186042943?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l26491x12 .1\" pitch header (optional)
1H62x6 .1\" pitch header (optional)
2IC1,IC2VP230LMDSOP8http://www.ebay.com/itm/130488665247?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649canbus transciever
1IC3LM1117-5VSOT2235V regulator
5JP*2 pin .1\" jumper header
1mbedLPC1768http://www.ebay.com/itm/200830573509?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649mbed uC
2Q1,Q22N2222SOT23General purpose NPN transistor
1R1R392M12063.9K resistor
4R2,R4-R6R102M12061K resistor
1R3R500M120650 Ohm resistor
2TR1-TR5ZJYS81R5-2PL51TG01http://www.digikey.com/product-detail/en/ZJYS81R5-2PL51T-G01/445-2223-1-ND/765232CM Choke
1Z11N5340BGC1702-15http://www.ebay.com/itm/150878122425?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l26496V, 5W Zener Diode
1X1USBhttp://www.ebay.com/itm/New-Vertical-USB-2-0-A-pcb-connector-socket-USB-A-Type-/300553895292?pt=LH_DefaultDomain_0&hash=item45fa687d7cvertical USB connector
2LCD0,LCD1TFThttp://www.mikroe.com/add-on-boards/display/tft-proto/320x240 LCD with touch screen

Assembly

1) LCD Displays

I found ribbon cable is a nice way to organize the wires to the displays. You'll need 12 conductors and I connected them in the following order:

1LED+
2LED-
3RSTB
4MOSI
5SCLK
6CSB
7X+
8X-
9Y+
10Y-
11VDD
12GND

First I connected all the GND connections (IM0, IM1, IM3, & 2 GND). Do not connect the bottom GND until you have the ribbon cable connected. After making all the ribbon cable connections (connecting the GND of the ribbon cable to the bottom GND pad), solder the GND bar from the previous step to the back of the bottom GND connection. Finally, make a connection from the back side 3.3V pin to IM2. Take a break and repeat for the second display. /media/uploads/TickTock/lcdtop.jpg /media/uploads/TickTock/lcdbot.jpg Once the two displays are complete combine all wires except CS0, CS1, X+, X-, Y+, and Y-. Connect X- of the left display to X+ of the right. Similarly connect Y- of the left display to Y+ of the right. Insulate any exposed wires.

2) PCB

Refer to the schematics to place all the components on the board. If you plan to install into the CANary 3D enclosure, DO NOT install the battery holder or the socket for the mbed and, instead, connect two wires to the VB and GND pads nearby. You will have to install the battery holder against the back wall to avoid interfering with the right-hand display and the mbed will have to be directly soldered. I have not found a socket with a low enough profile to fit in the space provided (depth of enclosure is limited by the space behind the center console). Also, I recommend keeping as much lead as possible on the Zener diode (bending it as shown to clear the back wall). Although it is operating well within parameters, the Zener gets quite hot during extended operation and the leads help dissipate the heat and keep it away from the PCB and other components.

/media/uploads/TickTock/pcbtop.jpg /media/uploads/TickTock/pcbbot.jpg

Once the PCB is populated, solder the LCDs to the PCB. CS0 connects to the right display and CS1 connects to the left. /media/uploads/TickTock/brddis.jpg

3) Testing

1)First step is to buzz out all connections from the LCDs to the pins in the main board
2)Next check the touch screen connections. On the main board, place an Ohm meter across X+ and X-. You should read 700 Ohms. Repeat for Y+ and Y-. Then test the resistance from X+ to Y+. With nothing touching the screens, it should read >100K Ohms and <1K when touching either screen.
3)When all connections are checked, solder in the mbed. Download and install the touch2 program http://mbed.org/users/TickTock/code/touch2/ to test the basic operation of the mbed and touch screens.
tips:
Touch screen is sensitive - excess flux on X+,X-,Y+,Y- connection on mbed can result in flakey operation
If touch is not working, double-check the LCD0_CS and LCD1_CS are not swapped. LCD0_CS must connect to the CS of the LCD that has X- & Y- connected to the mbed. LCD1_CS must connect to the CS of the LCD that has X+ & Y+ connected to the mbed.
4)Once touch2 works, it is time to connect to the OBD connector. I highly recommend double checking all connections from the OBD to the PCB with the cable in place before connecting to the Leaf. Buzz out all the pins in the OBS to make sure none are shorting to each other, Check that the 12V goes to the Zener (and nothing else) and the switched 12V to the resistor divider (and nothing else). Test the ground connection properly connects to ground and nothing else.
5)Once you are confident there are no shorts or wrong connections from the OBD connector, take a deep breath and plug it into your leaf. Touch2 program should come up and function. Unplug and install the latest CANary firmware. Test all features before installing into the enclosure (gids, cellpair, menu system, logging) since installing and removing from the enclosure is a PITA.

/media/uploads/TickTock/pcbdone.jpg /media/uploads/TickTock/functioning.jpg

4) Enclosure

The 3D printer leaves a lot of powder behind - I used a strong spray of water to get it out of all the cracks. The enclosure comes with a rather rough finish. I recommend convincing yourself you like it, then simply lightly sand then paint before assembly. Sanding is very difficult - the nylon is very nicely fused and doesn't want to sand. I tried sandblasting and that didn't work either. I had some limited success with filler and then sanding, but only on the outside - it is too difficult to sand the face.

5) Final Assembly

Revision:
69:6bfdfc002036
Parent:
58:4d06288d75a2
Child:
75:77bd26829dca
diff -r 2022fce701d0 -r 6bfdfc002036 utility.cpp
--- a/utility.cpp	Thu Apr 11 18:52:12 2013 +0000
+++ b/utility.cpp	Sun Apr 14 01:21:11 2013 +0000
@@ -9,6 +9,8 @@
     userIdle=(++secsNoTouch>userTimeout)?true:false;
     LPC_RTC->ILR |= (1<<0); // clear interrupt to prepare for next
     tick=true;
+    // will use this to generate a logTP() just before the next Message received.
+    if( (time(NULL) % 60) == 0) ZeroSecTick = true; // gg - at 0-second of each minute
 }
 
 void RTC_Init (void) {
@@ -37,7 +39,7 @@
 }
 
 void logCan (char mType, CANMessage canRXmsg) {
-    char sTemp[40];
+    char sTemp[40];    
     unsigned short ts = getTimeStamp();
     static unsigned char ii = 0, lasti = 0; // indexindex
     unsigned char changed,i;
@@ -46,6 +48,7 @@
     signed short packA;
     static signed short imotorRPM = 0;
     signed long imWs_x4;
+    
     secsNoMsg=0; // reset deadman switch
     if(logOpen){
         if(canRXmsg.id>0) {
@@ -105,7 +108,7 @@
         //if(i==22) logCP=true; //Turbo3
         //if( (i==22) && (yesBattLog) ) logCP=true; // only if enabled gg - Batt Log 
         if(i==22){
-            logCP=yesBattLog; // Only log is logging enabled
+            logCP=yesBattLog; // Only log if logging enabled
             showCP=true; // Always show
         }
         i*=7;
@@ -143,17 +146,33 @@
 void logTS () {
     CANMessage tsMsg;
     unsigned long secs = time(NULL); // seconds past 12:00:00 AM 1 Jan 1900
+    // NOTE: In Mbed, I believe that this is seconds past start of 1970, not 1900
+    //   but this is good, since seconds past 1970 is what CAN-Do expects. GG - Date Time
     tsMsg.id=0xfff;
     tsMsg.len=0xf;
-    tsMsg.data[0]=secs&0xff;
+    tsMsg.data[0]=secs&0xff; 
     tsMsg.data[1]=(secs>>8)&0xff;
     tsMsg.data[2]=(secs>>16)&0xff;
-    tsMsg.data[3]=secs>>24;
-    tsMsg.data[4]=0xff;
-    tsMsg.data[5]=0xff;
-    tsMsg.data[6]=0xff;
+    tsMsg.data[3]=(secs>>24)&0xff;
+    tsMsg.data[4]=0; // 0xff; gg - Date Time
+    tsMsg.data[5]=0; // 0xff; for CAN-Do
+    tsMsg.data[6]=0; // 0xff;
     tsMsg.data[7]=0xff;
-    logCan(0,tsMsg);
+    logCan(0,tsMsg); // Date-Time
+}
+
+void logErrMsg (char * errMsg) {
+    // log CAN-Do 8-character Pseudo Message
+    CANMessage tsMsg;
+    tsMsg.id=0xffe; // pseudo Message to CAN-Do log
+    tsMsg.len=0xf;
+    int iMsgLen = strlen(errMsg);
+    // 8 character message compatible with CAN-Do
+    for(int i=0; i<8; i++){
+      tsMsg.data[i]=' '; 
+      if( i < iMsgLen ) tsMsg.data[i]=errMsg[i];
+    }
+    logCan(0,tsMsg); // FFE Comment Message
 }
 
 void sendCPreq() {
@@ -162,7 +181,10 @@
     can1.monitor(false); // set to active mode
     can1SleepMode = 0; // enable TX
     can1.write(CANMessage(0x79b, data, 8));
-    logCan(1,CANMessage(0x79b, data, 8));
+    
+    if( ZeroSecTick ) { ZeroSecTick = false; logTS(); } // gg - 0-second EV bus
+    
+    logCan(1,CANMessage(0x79b, data, 8)); // Group 2 Request on EV
     data[0]=0x30; //change to request next line message
     data[1]=0x01;
     data[2]=0x00;
@@ -180,7 +202,10 @@
     can1.monitor(false); // set to active mode
     can1SleepMode = 0; // enable TX
     can1.write(CANMessage(0x79b, data, 8));
-    logCan(1,CANMessage(0x79b, data, 8));
+    
+    if( ZeroSecTick ) { ZeroSecTick = false; logTS(); } // gg - 0-second EV bus
+    
+    logCan(1,CANMessage(0x79b, data, 8)); // Group 4 request on EV
     data[0]=0x30; //change to request next line message
     data[1]=0x01;
     data[2]=0x00;
@@ -206,14 +231,20 @@
 void recieve1() {
     CANMessage msg1;
     can1.read(msg1);
-    logCan(1, msg1); //EVcan
+    
+    if( ZeroSecTick ) { ZeroSecTick = false; logTS(); } // gg - 0-second EV bus
+    
+    logCan(1, msg1); // EVcan Message Received
     led1 = !led1;
 }
 
 void recieve2() {
     CANMessage msg2;
     can2.read(msg2);
-    logCan(2, msg2); //CARcan
+    
+    if( ZeroSecTick ) { ZeroSecTick = false; logTS(); } // gg - 0-second EV bus
+    
+    logCan(2, msg2); // CARcan Message Received
     led2 = !led2;
 }
 
@@ -264,9 +295,9 @@
     cfile = fopen("/local/config.txt", "r");
     if (cfile==NULL){ // if doesn't exist --> create
         sprintf(sTemp,"No config file found.\n");
-        logMsg(sTemp);
+        logMsg(sTemp); // no config file
         sprintf(sTemp,"Calibrating touch screen.\n");
-        logMsg(sTemp);
+        logMsg(sTemp); // calibrating
         //tt.setcal(5570, 34030, 80, 108, 33700, 5780, 82, 108, 32500);// bypass calibration using my values
         tt.calibrate();   // run touchscreen calibration routine
         // NOTE: calibrates screen 1 first, then screen 0.
@@ -303,10 +334,10 @@
         if(ff<3){//If not latest format, save as latest format
             saveConfig();
             sprintf(sTemp,"Config file format updated.\n");
-            logMsg(sTemp);
+            logMsg(sTemp); // config forat updates
         }
         sprintf(sTemp,"Config file loaded.\n");
-        logMsg(sTemp);
+        logMsg(sTemp); // config file loaded
     }
 }