heinzboehmer's 2002 Topaz 6MT Coupe

[heinzboehmer]

Very interesting, that would be cool for sure!

Yep! They're nice to have in datalogs. Here's how to request them, if you're interested: https://nam3forum.com/forums/forum/m...734#post266734

Gauge.S can relay data over CAN too, so just a matter of setting it up for that and any standard CAN datalogger will have access to them.

[heinzboehmer]

Went for a drive, found a couple bugs in my Gauge.S config, fixed, logged.

Here's what the BlueBus saw, with my comments added on the right:

[25095117] DEBUG: IBus: RX[7]: 3F 05 BB 01 04 B1 35  ->  1st gear,  1201 RPM
[25095616] DEBUG: IBus: RX[7]: 3F 05 BB 01 04 D4 50  ->  1st gear,  1236 RPM
[25096138] DEBUG: IBus: RX[7]: 3F 05 BB 01 04 F9 7D  ->  1st gear,  1273 RPM
[25096653] DEBUG: IBus: RX[7]: 3F 05 BB 01 04 EC 68  ->  1st gear,  1260 RPM
[25097668] DEBUG: IBus: RX[7]: 3F 05 BB 01 05 48 CD  ->  1st gear,  1352 RPM
[25098177] DEBUG: IBus: RX[7]: 3F 05 BB 01 05 A3 26  ->  1st gear,  1443 RPM
[25099204] DEBUG: IBus: RX[7]: 3F 05 BB 01 06 89 0F  ->  1st gear,  1673 RPM
[25099712] DEBUG: IBus: RX[7]: 3F 05 BB 01 06 B1 37  ->  1st gear,  1713 RPM
[25100239] DEBUG: IBus: RX[7]: 3F 05 BB 01 07 00 87  ->  1st gear,  1792 RPM
[25100737] DEBUG: IBus: RX[7]: 3F 05 BB 01 07 74 F3  ->  1st gear,  1908 RPM
[25101250] DEBUG: IBus: RX[7]: 3F 05 BB 01 09 3B B2  ->  1st gear,  2363 RPM
[25101759] DEBUG: IBus: RX[7]: 3F 05 BB 01 0B 1F 94  ->  1st gear,  2847 RPM
[25102268] DEBUG: IBus: RX[7]: 3F 05 BB 01 0D 27 AA  ->  1st gear,  3367 RPM
[25102779] DEBUG: IBus: RX[7]: 3F 05 BB 00 0D FA 76  ->  Clutch in, 3578 RPM
[25103285] DEBUG: IBus: RX[7]: 3F 05 BB 00 0A 59 D2  ->  Clutch in, 2649 RPM
[25103810] DEBUG: IBus: RX[7]: 3F 05 BB 02 08 9C 17  ->  2nd gear,  2204 RPM
[25104313] DEBUG: IBus: RX[7]: 3F 05 BB 02 09 EE 64  ->  2nd gear,  2542 RPM
[25104825] DEBUG: IBus: RX[7]: 3F 05 BB 02 0A C0 49  ->  2nd gear,  2752 RPM
[25105338] DEBUG: IBus: RX[7]: 3F 05 BB 02 0B CB 43  ->  2nd gear,  3019 RPM
[25105848] DEBUG: IBus: RX[7]: 3F 05 BB 00 0A 6C E7  ->  Clutch in, 2668 RPM
[25106370] DEBUG: IBus: RX[7]: 3F 05 BB 03 07 F3 76  ->  3rd gear,  2035 RPM
[25106875] DEBUG: IBus: RX[7]: 3F 05 BB 03 08 6A E0  ->  3rd gear,  2154 RPM
[25107388] DEBUG: IBus: RX[7]: 3F 05 BB 00 08 BE 37  ->  Clutch in, 2238 RPM
[25107899] DEBUG: IBus: RX[7]: 3F 05 BB 00 05 F9 7D  ->  Clutch in, 1529 RPM
[25108410] DEBUG: IBus: RX[7]: 3F 05 BB 00 06 DD 5A  ->  Clutch in, 1757 RPM
[25108941] DEBUG: IBus: RX[7]: 3F 05 BB 00 08 18 91  ->  Clutch in, 2072 RPM
[25109434] DEBUG: IBus: RX[7]: 3F 05 BB 00 07 DF 59  ->  Clutch in, 2015 RPM
[25110959] DEBUG: IBus: RX[7]: 3F 05 BB 02 0B 4A C2  ->  2nd gear,  2890 RPM
[25111470] DEBUG: IBus: RX[7]: 3F 05 BB 02 0B 63 EB  ->  2nd gear,  2915 RPM​

Looks good to me!

Note that since this is on the I bus side of things, the message is structured like so:

| Source | Length | Destination | Gear | RpmHi | RpmLo | Checksum |
|   3F   |   05   |     BB      |  01  |  04   |  B1   |    35    |​

Progress on the BlueBus side is steady, should be able to test that out soon.

While driving, I got the idea to "buffer" the gear change in the cluster screen. Essentially, if a message with `gear == 0` arrives, we keep the previous gear on screen for the length of some timeout (thinking 1-2s) before displaying 0. If a message with `gear != 0` arrives before the timeout expires, we cancel the waiting and immediately display the new gear.

I think this will make the user experience a little nicer, since the display won't be jumping around in between gear changes. The `Gear` param in Gauge.S is set up to send 0 on clutch in, so the jumping around is inevitable, unless something like the above is implemented.

I'm pretty sure Porsche employs a similar strategy with their cluster gear display and those feel pretty natural, so will take a page out of their book.

I've also decided to implement the "money shift" logic entirely in the BlueBus FW, since I don't feel like messing with Gauge.S anymore. This is why RPM is included in the message.

And for posterity, here's the config I settled on for Gauge.S (the newer FW requires the `funData` section to be in `config.json`):

{
    "canSpeed": 500,
    "funData": [
        {
            // D bus to I bus relay
            "name": "d2i_relay",
            "frequency": 2, // Every 0.5 seconds, can't seem to get it to go faster
            // Don't forget to add more `0xFF` bytes as a pseudo-malloc if array grows.
            // d2i_relay[2] = Gear, d2i_relay[3] = RPM[8:15], d2i_relay[4] = RPM[0:7], d2i_relay[3] = Checksum.
            "values8": ["0xBB", "0x06", "0xFF", "0xFF", "0xFF", "0xFF"],
            "expr": [
                "obtainKline('d2i_relay', 0x01)" // (0x00 - DS2 protocol) | (0x01 - arrayIndex 1)
            ]
        }
    ],
    "ecuparam": [
        // Params

        ...

        // Start D bus to I bus Relay Logic
        {
            "header": "SetD2IDataByte2",
            "expr": "setData('d2i_relay', 2, {Gear})",
            "hidden": true,
            "noLog": true
        },
        {
            "header": "RPMHighBits",
            // Mask bits 8-15 and shift
            "x": "RPM",
            "expr": "(x & 0xFF00) >> 8",
            "hidden": true,
            "noLog": true
        },
        {
            "header": "SetD2IDataByte3",
            "expr": "setData('d2i_relay', 3, {RPMHighBits})",
            "hidden": true,
            "noLog": true
        },
        {
            "header": "RPMLowBits",
            // Mask bits 0-7
            "x": "RPM",
            "expr": "x & 0xFF",
            "hidden": true,
            "noLog": true
        },
        {
            "header": "SetD2IDataByte4",
            "expr": "setData('d2i_relay', 4, {RPMLowBits})",
            "hidden": true,
            "noLog": true
        },
        {
            "header": "SetChecksum",
            // 189 (0xBD) is the precomputed XOR result of the first two static bytes of the d2i_relay message (0xBB ^ 0x06)
            "expr": "setData('d2i_relay', 5, (189 |^ {Gear} |^ {RPMHighBits} |^ {RPMLowBits}))",
            "hidden": true,
            "noLog": true
        }
        // End D bus to I bus Relay Logic.
    ]
}

[bigjae46]

Unfortunately I'm pretty sure it doesn't. Anything where the DME needs to know the status of the brakes it's simply evaluating the brake light switch. I'd love to be proven wrong on this, but I haven't found any evidence of the pressure data being available in the DME (and I've specifically looked for it).

The DME monitors the hall effect switch on the brake pedal to open/close the brake booster solenoid through the ECU. There is no required direct communication between the DME and MK60. IIRC, I only have one wire that runs directly between the ECU and MK60 which is blue with red stripe? You can't simply delete the hall effect switch and replace with an on/off switch...don't ask how I found this out.

If you look at GSR Motorsports, you can tap into the brake pressure sensor wires and pull pressure data. This has been a game changer since I've been pulling the data. I have an AiM Solo 2 DL with an ACC CAN2 expansion.

MK60 Brake Pressure Sensor Data – GSR Motorsports

[heinzboehmer]

The DME monitors the hall effect switch on the brake pedal to open/close the brake booster solenoid through the ECU. There is no required direct communication between the DME and MK60. IIRC, I only have one wire that runs directly between the ECU and MK60 which is blue with red stripe? You can't simply delete the hall effect switch and replace with an on/off switch...don't ask how I found this out.

If you look at GSR Motorsports, you can tap into the brake pressure sensor wires and pull pressure data. This has been a game changer since I've been pulling the data. I have an AiM Solo 2 DL with an ACC CAN2 expansion.

MK60 Brake Pressure Sensor Data – GSR Motorsports

Yeah, this might have to be the route I go down.

There are three things I want to log that are only accessible via DS2 (and thus off limits with this new relay feature):

1. Throttle pedal position (not TPS, I want to see how my foot is messing up, not what the DME is telling the throttle bodies to do)
2. Brake pressure front
3. Brake pressure rear

I can get (1) on CAN with modified DME FW.

For (2) and (3), I can either keep trying to optimize the SW to deal with the multiple D bus commands gracefully or just give up and run a few wires from the pressure sensors to the ADCs on Gauge.S. The latter is sounding way more appealing at the moment. Should be super easy to calibrate based on the DS2 brake pressure data, as well.

[heinzboehmer]

Aaand done!

Excuse the terrible everything. The majority of my focus was going into not crashing. Nice videography and smooth driving were very low on the priority list.

You can see a few things in the video:

1. The latency is a big one. Keep in mind that the gear won't update until the clutch is fully released, so street driving with feathering of the clutch towards the end of its travel will make it appear worse than it is. That said, it still is slow because of the 2 Hz refresh rate. I messed around with sending D bus messages at different frequencies and it seems like the IKE itself tops out at that same 2 Hz, so unfortunately, I'll just have to deal with it. I don't think it'll be a huge issue since I don't plan on staring at it during normal driving.
2. "m" comes on as a money shift indicator! It essentially tells you if it's safe or not to downshift. However, I did find out that the low OBC will not update just the "m". If the value stays the same and you ask it to show/clear the "m", nothing will happen. You need to clear the display first, which is why you can sometimes see it flash back to the clock briefly. As a workaround, I added a separate mode with no money shift indicator that I can switch to if it turns out the flashing is too annoying.
3. The buffered `0` gear works great. It's set to wait for 1.5s before displaying 0, which works out to be a very natural amount of time that elapses from clutch in to 0 vehicle speed, when coming to a stop. Also way more than enough time to perform a gear change. Very happy with this part of the implementation.

Quick test drive was all I had time for on my lunch break. Will spend some time later cleaning up the code and upload to GitHub.

[heinzboehmer]

BlueBus changes uploaded to my fork: https://github.com/heinzboehmer/BlueBusMirrorMemory

The Gauge.S config in https://nam3forum.com/forums/forum/m...515#post360515 seems to be working correctly. Haven't changed anything since.

[Obioban]

The 2hz is unfortunate-- otherwise would be fun to do something like oil pressure or AFRs.

[heinzboehmer]

The 2hz is unfortunate-- otherwise would be fun to do something like oil pressure or AFRs.

The refresh limit is unfortunate indeed. Was really hoping to be able to do something like you describe, but I don't think it'll be very useful at this frequency.

Another thing to note is that while the low OBC display can show four digits, it can only show two sig figs. It accepts a BCD formatted uint8 and a multiplier, so anything above 99 will lose precision fast. Didn't get a video of this but once you get above 1000 RPM (so basically all the time), the display counts up in chunks of 100.

In practice, this means that any number with a decimal point (e.g. AFR) cannot be displayed in a meaningful way. This is exactly why I left battery voltage out, it doesn't seem all that useful at two sig figs and splitting the displayed value up into place values would be very unintuitive to read.

For higher frequency/precision stuff I still have the screen on Gauge.S, which is a good enough compromise.

[Obioban]

Would be fun to get a red/black OLED designed to be used in the sun that would go in the SMG display area, similar to the e39's Gauge.S

Edit: Just emailed them to see if I could get the ball rolling on that

[heinzboehmer]

Would be fun to get a red/black OLED designed to be used in the sun that would go in the SMG display area, similar to the e39's Gauge.S

Edit: Just emailed them to see if I could get the ball rolling on that

Someone did something very similar, just not OLED:




But something about it just looks... off. Not the upside down screen, just looks out of place to me for some reason.

There's also this: https://shop.sorek.uk/products/gauge-s-pod-52mm

But again, not stock looking enough.

[Bry5on]

I have some of those 1.54" screens and that was my original thought with Gauge.S - really to have it on the G-plot screen all the time

Mostly I don't need to look at numbers unless I'm datalogging or debugging, but it's fun to see the G-plot and limits. That and digital speed/gear are the only real use cases I'd personally have for it over the ash tray area

[Obioban]

Someone did something very similar, just not OLED:




But something about it just looks... off. Not the upside down screen, just looks out of place to me for some reason.

There's also this: https://shop.sorek.uk/products/gauge-s-pod-52mm

But again, not stock looking enough.

That might actually look better on the M3's more yellow cluster. But, yes, sure doesn't look "right" there.

[Ramage]

There's also this: https://shop.sorek.uk/products/gauge-s-pod-52mm

But again, not stock looking enough.

I like the idea of 52mm pod even though it is far from stock looking, my vision would to have it display oil pressure, AFR, coolant temp on a cycle and maybe knock or miss fires if detected. It is on the list, but not super high up it.

heinzboehmer wanted to say thanks for providing the final motivation to get a filament 3d printer from reading this thread.

[heinzboehmer]

heinzboehmer wanted to say thanks for providing the final motivation to get a filament 3d printer from reading this thread.

Awesome! Mine has been an awesome tool to have in the garage.

Also, made some UX changes to the extended low OBC display, after actually using it for a while today:

1. Added an "RPM + Overrev" page. Same idea as the "Gear + Overrev" one, but with RPM being displayed instead of gear.
2. Switched over to grab "Oil Temp", "Coolant Temp", "Ambient Temp" and "Vehicle Speed" from Gauge.S. They were previously being grabbed from I bus, but they seem to refresh once every ~2s, which is essentially useless (especially for speed).

BlueBus FW changes on my fork. I also created a new repo to host my Gauge.S configs: https://github.com/heinzboehmer/GaugeSConfigs/

[heinzboehmer]

Wait, why am I displaying ambient temp? That's already part of the stock cluster functionality...

I'll fix in a bit.

Edit: Fixed and repos updated.