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stuart

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  1. Isuzu / Volvo Penta / VDO Tachometer Gauge - hour counter not working - fixed!

    in Boat Building & Maintenance

    Posted

    Hi Stuart,

     

    Thanks for the info, I'll take a look at the code.

     

    What COG controller does this unit use?

     

    Also note your dump of the PCF8582C EEPROM

    ... 0x05,0xF2,0x05,0xF2,...

    Interesting repeat, do you know why? Did you decode any of the other addresses?

     

    I dug through some old email I had, here are several links which may be useful - particularly the NXP links below to the various chips.

     

     

  7. Isuzu / Volvo Penta / VDO Tachometer Gauge - hour counter not working - fixed!

    in Boat Building & Maintenance

    Posted

    The VDO tacho stores the engine hours inside an EEPROM - labelled pcf8582c. A dump of this chip looks like this...

     

     

    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x31

    ,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00

    ,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00

    ,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00

    ,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00

    ,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00

    ,0x00,0x00,0x00,0x00,0x05,0xF2,0x05,0xF2,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00

    ,0x00,0x00,0x01,0x90,0x01,0x00,0x00,0x00,0x0F,0xA0,0x05,0x17,0x29,0x28,0x0A,0x00

    ,0xFF,0x00,0xFF,0x00,0x05,0x17,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x10,0x00

    ,0x65,0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00

    ,0xB2,0x30,0x31,0x32,0x30,0x00,0x33,0x41,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00

    ,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00

    ,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00

    ,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00

    ,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00

    ,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC2,0x00,0x00,0x00,0x08,0xA9

    My engine hours are

    F2 05 F2 = 0x05F205F2 = 1522 hours

  9. LED Lighting

    in Boat Building & Maintenance

  10. Isuzu / Volvo Penta / VDO Tachometer Gauge - hour counter not working - fixed!

    in Boat Building & Maintenance

    Posted

    Hi Matilda, glad you got it working!

     

    Since building this, I'm finding that the OLED screen is difficult to read in direct sunlight, so I may replace with an old fashioned LED figure of 8 display - but don't let that put you off!

     

     

    As you are using DenMike's code, I'm not 100% on the alignment of the the logo, however I suspect its this line...

     

    display.drawBitmap(24, 0, Logo);
    Try changing the 0 to another value and see if the alignment moves.

  15. Python Drive - replacement parts

    in Boat Building & Maintenance

    Posted · Edited by stuart

    Strewth!

     

    Just got a reply from Samantha Bird (samantha.bird@arleigh.co.uk) who are actually from Midland Chandlers - who must have got my email forwarded to them when I emailed the above address !!

     

     

    4 rubber mounting blocks for a Python P30-R - they want £80 + £6 postage + VAT = £103.20

     

    For 4 bits of rubber - the whole unit cost about £300 !

     

    Sod it, I'll wait for it to fail and replace with a centaflex.

  20. Can I swap a Webasto Thermo Top E for a Top VEVO?

    in Boat Building & Maintenance

    Posted · Edited by stuart

    The Thermotop V in automotive use is usually CAN controlled off the vehicle. As NMEA says it can also be controlled via W bus. They're fitted to a lot of current production vehicles.

     

    If you've got an electronics background:-

    W bus is an ISO9141 type bus and there's the C source code for a driver on source forge "Wbus driver". The physical layer can be implemented using an open collector transistor with a 1K2 1/2W pull up. It's a challenge response type protocol however if you code it carefully you can ignore the reponse and just send the messages. These need to be sent every 10 second to stop it timing out and shutting down. The commands are very simple Command, Data, Checksum. The only important ones are run (with a time value) and shutdown - though stopping sending the message has the same effect. The whole thing can be coded in Basic on a picaxe if you're careful.

     

    Yes, I'm aware of the WBus protocol - I've built an interface for it...

     

    https://github.com/stuartpittaway/WebastoWBUSInterface

     

    You do need to be careful to avoid getting the potential for 12v into a 3.3v or 5v controller though. Only using a simple circuit as described above I would frequently get timeout errors with the ThermoTest software - the circuit below never has this problem.

     

    Webasto%20WBus%20Arduino%20Serial%20Inte

     

    Being a Webasto dealer I have shied off saying something but I suppose I should say it really, whilst it is possible to get them operating I really wouldn't bother, they have been reduced in weight and size due to ever increasing demand from the automotive OEM market and I really don't feel they are up to the job of heating a boat for extended periods.

     

    I agree with the notion that they are not suitable for long term use, I'm certainly tempted, purely because when fitted to cars, they are expected to last and run for many years without servicing, and additionally because they are so cheap, even if I got 2-3 years out of one, for £140 I can almost treat it as a disposable item.

     

    I wouldn't use one as my only source of heating for live aboard usage, but for the chilly spring/autumn evening I quite like the idea.

     

    Its quite simple (for me!) to knock together a microcontroller and get it working. I've got a ThermoTop V sitting on a bench in front of me - about 2 year old, Land Rover unit.

     

    Its been operating in supplemental heating mode (300hrs), but works fine in parking mode as well.

  24. Economizing a solution to flat batteries.

    in Boat Equipment

    Posted

     

    Thank you all, good to know. We think we have enough dosh and roof space for 2 100W panels, fingers crossed anyway, the only clutter up there is a chilli plant hah.

    Biggest doubt at the minute re: panels is whether to buy a kit or individual parts.

     

    If anyone has time, anyone mind giving a nod about these?

     

    http://www.hollybrookps.co.uk/pv_modules/100w-solar-panel-a-rated-monocrystalline.html

    If buying the kit separately, which of these panels?
    Or these kits?
    Muchas gracias for all your help so far smile.png

     

    Nothing wrong with what they are selling, but Bimble are better value for money. You will also want a MPPT charger, not the PWM one (these are cheaper and less performant)

  25. Economizing a solution to flat batteries.

    in Boat Equipment

    Posted · Edited by stuart

    I'd recommend Bimble Solar, they often have good deals on second hand panels - which are much cheaper than you expect.

     

    Two of these panels would give you 240W, plus an 20Amp MPPT charger like this (http://www.bimblesolar.com/offgrid/mppt/Tracer2215BN)

     

    http://www.bimblesolar.com/solar/individual/kyocera120w

     

    and apart from cable, would have a solar charging solution for £200.

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