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  1. B

    Automation seems easy but what am I missing?!?!

    Sorry but you lost me there.........no idea where the timer comes in or where you get constantly switching on off from. Need for selector switch also eludes me. Seems a lot you are not telling us or you've managed to get things A-up.
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    Make one circuit current track with another circuit current

    I've used both methods described here on different occasions, with the only difference in the transistor switch being replacement of R1 in Alec's diagram with a diode.
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    Automation seems easy but what am I missing?!?!

    Does not matter what current the machine draws as you are just powering a relay (240v) off the motor drive or similar. i.e. it's a voltage operated device. Contacts on the relay (common and normally open)will be voltage free at this stage. Connect all your contacts in parallel so if any...
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    Automation seems easy but what am I missing?!?!

    Is there any particular reason why you cannot just use a small standard 240v relay, one on each machine, arranged to come on at the same time you switch the motor of the machine on? Cannot see a reason to detect current.
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    Floating pins on Microcontroller

    Like i said, I never had a problem.
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    Floating pins on Microcontroller

    Floating pins on Picaxe are normally no problem.
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    Fuse size selection for kids 12V electric car.

    In that case if you can give any info that might point in the right direction....nothing on the motor for instance?
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    USB to RS232 adapter

    Drivers..... http://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers.aspx
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    My final Electricity Generator Idea?

    Is what you are taking freely available or only on prescription..??:)o_O
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    Fuse size selection for kids 12V electric car.

    30A is the maximum current the relay will handle, nothing to do with the fise size. Being a bakolite fuse holder, one would expect a relatively large current BUT the wiring size sort of suggests that not anywhere near 30A. What circuit is the fuse in...?? main motor ..?? ..unknown..?? A bit more...
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    USB to RS232 adapter

    I've always used in conjunction with a micro but yes, seems correct otherwise. When connected to the pc , assuming drivers are installed, you should see it come up as a particular com port, seems to vary so best to check in "hardware" for the correct allocation.
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    USB to RS232 adapter

    You pick which supply you want to drive the micro with. In the case of Arduino, either 3.3v or 5v. Of course, if you supply the micro via an external supply, then do not use either of these. This is for stand-alone programming. Obviously with the common ground connection as well. Tx Rx swap...
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    Dark activated + PIR + clock timed switch?

    I'm sure they have those movement detector light fittings where you live. They come from China and have every aspect included for what you require for about $20.00. Exception would be the size of the detector (micro???). I have to wonder about why this would be a requirement as it would be more...
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    USB to RS232 adapter

    http://www.ebay.com.au/itm/PC-USB-to-RS232-RS485-UART-TTL-Signal-Converter-New-/260844049165?hash=item3cbb84530d:g:6s4AAOSw-KFXfgmL $15.00 or if you want cheap.... $1.00 ...
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    Li-Ion battery question

    Excessive heat , usually fire.
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    Auto-disable secondary battery?

    Think about using a battery with same voltage as a backup, forget the sw, xor etc just use a dual schottky diode in a bus tie arrangement such as link below. http://www.rcgroups.com/forums/showthread.php?t=1854050
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    Auto-disable secondary battery?

    Where does the xor get it's supply from during all this ?
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    Question about wiring computer fans to be used with batteries.

    mmm...having seen the result of a certain mobile phone and it's battery problems, one might end up with more realistic flames coming out the "tailpipe" than one originally intended. :eek: :oops:
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    Auto-disable secondary battery?

    If the primary and secondary battery sources are slightly different voltage( or configured as such) then perhaps a voltage comparitor circuit with afore mentioned relay or mosfet controlled output.
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    Question about wiring computer fans to be used with batteries.

    Perhaps consider the input to the fan is much larger than the output to retain flow of air. (usually 2.5 times) May not be important but just a note.
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