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Simple circuit with logic need

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trader007

Joined Feb 27, 2010
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dendad said:
Really I think you need to make it fail safe as mentioned above.
It is not worth having just lights that can be ignored if you are dealing with dangerous machines. Some system of needing both hands holding separate switches operated so to keep arms out of harms way, and if the device fails or there is a problem detected, the machine just does not run.
Any short cut to save money is a false saving, and any system that relies on just noticing and obeying lights is probably not good enough. A lot of people run red lights!!!
A loud alarm and flashing error light will be better, and I think toss the 3V battery supply idea and run it on a decent power supply.
Batteries go flat and will not be replaced. Make it so if the power supply fails, or for that matter, any part fails, the complete system powers down to a safe level.
You need to make it idiot proof, but remember, idiots can be very resourceful!
Click to expand...
Idiot proof most definitely, that is why it needs to auto turn on and off when not in use. It's also why I don't want a weird mix of lights... I just want a simple GREEN for OK to LIFT, and RED means NO, THIS IS A BAD SITUATION.

It has to be on battery power because these lifts just run on air (from the buildings air suppy). There is no power hookup available on the hoists.
I am finding that 3v micro relays run about 50ma on the coil... which puts me around 140ma if I want to do this with relays. It would work, but I think they would be changing batteries every couple weeks. The arduino route would go months on one battery... and since it's simple code I would imagine it would be very reliable.
 
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