Controller hardware suggestions for first DIY build

Aciera wrote:

So a prox sensor needs +24v and -24v

I don't mean to be overly pedantic here but that would be 48V on the sensor. So just for the record -24V is not the same as 0V.
But yes I do realize that you mean the negative terminal of the 24V DC supply.

That happens a lot on the net, shocking at times, but also reminds me of the time i was building high power audio amplifiers that used up to +-63V, so 126V in total at 15 or more amps, enough to void a person off of it's mortal coil !
And since we withered off topic, DC is much more lethal than AC.

I actually beg to differ on that Tommy:

www.wikilectures.eu/w/Physiological_effect_of_electric_current

The effects of AC (alternating current) depends largely on frequency, low frequency tends to be much more dangerous than high frequency. AC with the same amperage and voltage as DC is more dangerous and provoke worse effects on the human body. Low frequency AC provokes muscle contraction (tetany) which can induce the "cannot let go" effect by freezing the muscles of the hand. This happens because the flexors of the hand are stronger than the extensors, so when an external electrical stimulation is applied, the flexors outdo the extensors. AC has a more of a tendency to induce heart fibrillation while DC makes the heart stop. That is why defibrillation equipment is DC, which stops the heart and gives a chance to recover.

Aciera wrote:

I actually beg to differ on that Tommy:

www.wikilectures.eu/w/Physiological_effect_of_electric_current

The effects of AC (alternating current) depends largely on frequency, low frequency tends to be much more dangerous than high frequency. AC with the same amperage and voltage as DC is more dangerous and provoke worse effects on the human body. Low frequency AC provokes muscle contraction (tetany) which can induce the "cannot let go" effect by freezing the muscles of the hand. This happens because the flexors of the hand are stronger than the extensors, so when an external electrical stimulation is applied, the flexors outdo the extensors. AC has a more of a tendency to induce heart fibrillation while DC makes the heart stop. That is why defibrillation equipment is DC, which stops the heart and gives a chance to recover.

There are so many contradictory statements there that i am baffled !
Aciera, thank you, but definitely needs more research.

Ha, yes just like most things in life the deeper we dig the more complicated it gets.