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Detecting solenoid ON and OFF state

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Prakash12345

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Hi,
I want to detect solenoid ON and OFF state.
If solenoid ON, with respect to HIGH signal no problem.
If solenoid not working means with respect to HIGH signal, solenoid remains OFF state. In that situation I have to generate HIGH or LOW signal.
So I designed a circuit with XOX gate attached here.
I have to detect 128 solenoid ON/OFF state.
My question is, this circuit is will withstand for 128 solenoid?
If not means any other solution?
Solenoid.jpg
 

Hi,

in your case input_1 is continously HIGH, making a NOT gate.. it just inverts the logic state of input_2.

****
instead of using 128 mechanical switches (I don´t like) you could just measure the coil current.

A diode and a resistor in one of the power lines of the solenoid... generates about 0.6...1.0V when solenoid is properly powered, but 0V when not powered (or contact problem, or broken wire).

128 is a huge count, therefore I´d check them serially instead of parallel.

--> a diode and a resistor at each of the 128 solenoids. 8 pieces of 1:16 analog MUX, a 1 of 8 digital demux (like HC138) and a comparator with 300mV threshold.

Klaus


Klaus
 
Hi,
Actually input_1 is a HIGH or LOW signal from micro-controller using decoding technique. At some situation solenoid may not work like you(@KlausST) said. Using XOR gate I comparing signal from micro-controller and solenoid state. XOR gate will produce HIGH o/p if inputs are in different state.Solenoid.jpg
 

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