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About stuart
- Birthday 12/20/1975
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Website URL
http://www.waterexplorer.co.uk
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Gender
Male
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Location
West Midlands
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Boat Name
nb Dusk till Dawn
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Boat Location
West Midlands
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Thanks for the info, looks like a similar replacement device for the AD7280A is the LTC6803-3. Just double the cost and out of stock everywhere!
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Sure, I'd be interested in a PDF schema. Thanks.
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Thanks for that. Are you only using 4x cells for a 12V style setup? As luck would have it, I'm also part of a project for a pick and place machine 🙂 https://indexmachines.io/
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Heres the PDF of the schematic - https://github.com/stuartpittaway/diyBMS-CurrentShunt/blob/master/CurrentShuntCircuit/export/Schematic.pdf I've spent thousands with JLCPCB this year already ! @nicknorman forgot to ask, what was the cell monitoring chip you used? I'd be interested to use that in my next designs.
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Yep, thats what I did - RS485/MODBUS based Current Monitor, with electrically isolated data connection. https://github.com/stuartpittaway/diyBMS-CurrentShunt
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Electronic float switch recommdations
stuart replied to stuart's topic in Boat Building & Maintenance
Good idea, might try that with an acrylic sheet to bolt everything to. -
I agree custom chips are the best way for that. I used the INA228 in my current shunt/monitor and that been super accurate (20bit ADC) When monitoring cells, a lot of people have multiple parallel banks, so that's what the 256 monitors allows for, like 5x16 etc.
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Ah, but that's cheating!! 🤣 I wanted the flexibility of a unknown number of cells to monitor, my solution can monitor up to 256 cells and provide about 1amp balance current for each.
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I use an external 1.25V reference for measuring via the Atmel chip. I'm using attiny devices and the internal reference wasn't good enough.
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Take a look at software antialias filters, or over sampling. You can increase the effective resolution without changes in hardware.
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Electronic float switch recommdations
stuart replied to stuart's topic in Boat Building & Maintenance
Thanks @Jen-in-Wellies it is a greaseless gland. From the comments above, I think a "normal" float style switch is going to be the best option - I'd hoped that the electronic/no moving parts would have been a better option by now, but alas! Next question - mounting the thing, previous float switch (from boat builder 15 years ago) was mounted on a flat steel plate and thrown into the bilge - this eventually rusted, broke up and clogged up the pump! Any other ideas for fixing both the pump and float switch? -
Electronic float switch recommdations
stuart replied to stuart's topic in Boat Building & Maintenance
Ok, so once the sensor is cleaned up it works normally? That's why I liked the look of the water witch, as it doesn't trigger on oil or fuel, just water. However not rain water!! -
Electronic float switch recommdations
stuart replied to stuart's topic in Boat Building & Maintenance
The power usage is tiny, 0.003A on the water witch I mentioned. I've got solar so that would easily cover that. Agreed, I just find over a period of years they jam up with dirt and become unreliable. Does it eventually stop or permanently damage the unit? -
stuart started following Electronic float switch recommdations
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I'd like to add an automatic switch to my bilge pump. Not keen on manual float switches as they do seem to get stuck over time. I've a Cruiser stern which generally has a dry bilge but if the rain channels block, rain water can enter the bilge. Had about 6" of water in the bilge after about 6 weeks - this isn't normally the case though, looks like build up of mud had blocked the drain. Any recommendations, for electronic style switches? I looked at the water witch one but that has a warning about rain water not being sensitive to the device.
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Good to know thanks @matty40s