Electronics > Projects, Designs, and Technical Stuff
What do you think of this NPFA20 compliant diesel fire pump panel?
DBecker:
--- Quote from: coppercone2 on November 04, 2019, 11:12:21 pm ---I thought this is a supply chain problem to use arduino because you cannot get them to manufacture more real arduinos on demand, only what is on market?
--- End quote ---
There are plenty of parts that could be discontinued unexpectedly. The military and automotive industry have expensive processes in place to mitigate that risk. Industrial and consumer products generally don't. Arguably using a mass-produced subassembly is likely to provide better availability of NOS parts than trying to source the original components a few years later.
(I still look at any product using an 555 timer or Arduino board as likely having beginner-hobbyist-level hacked together bits elsewhere.)
wraper:
I wonder why in the hell would they put arduino instead of just mounting bare MCU on their custom board. It's not like they can't load the same firmware into it.
floobydust:
I can't see where the batteries are actually connected.
The fuses should be first at the battery wiring, here they first go to a few terminal blocks, diodes, and relays?
Caixa de Transferencia has no fuses. There's three 10A DC fuses/disconnects but they seem to be for the internals PLC, Arduino in the main cabinet.
The battery chargers have SKR26/12 blocking diodes at the outputs, so the charging voltage is always low unless the trimpot is cranked up. Equalization mode is not used. The diodes should have a heatsink like they do in the Caixa de Transferencia.
I would want the pump to start in an emergency.
coppercone2:
--- Quote from: wraper on November 05, 2019, 06:55:03 pm ---I wonder why in the hell would they put arduino instead of just mounting bare MCU on their custom board. It's not like they can't load the same firmware into it.
--- End quote ---
convenience if the capabilities are regarded as an offshoot from usual money makers, if you can get away quick with libraries to test market and get sales interested etc.. fast money
however, just the fact that its a fire safety system bothers me a bit
wraper:
--- Quote from: coppercone2 on November 05, 2019, 10:57:58 pm ---convenience if the capabilities are regarded as an offshoot from usual money makers, if you can get away quick with libraries to test market and get sales interested etc.. fast money
--- End quote ---
There is zero actual convenience. Routing MCU + few passives is not harder than placing all those pin header connectors for Arduino. Also they need to manually solder header connectors to Arduino PCB. Probably after desoldering original ones as I cannot find original Arduino being sold without connectors.
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