which type of current you want to sense AC or DC??
other thing doyou want send values of current or just want to know that current is present or not in that particular loop or some hardware??
Ok, its fine to embedd a diode. But how do, I get to know if current is flowing or not? I mean, if current stops flowing after wire gets cut down by wearing, how would i be knowing?
I visualized the system like this:
If the current is flowing, that "hardware" is transmitting that information to a reader placed remotely say, 20 metres away
If it stops working, the reader identifies that ok, this particular "hardware" with this unique "id" is not working.
Please tell if i should explain more
If I am picturing the thing correctly, you want to attach to each screen one wireless transmitter to send the information to a point 20 meters away. Am I right?
The circuit to embed would be a simple thin wire...
If the wire breaks, then you know the screen has worn out.
You'll know when the wire breaks because it will pass no current.
You could use a simple circuit to sound an alarm or light an indicator, or transmit a signal or anything else..
and the cct could be embedded too.
The circuit to embed would be a simple thin wire...
If the wire breaks, then you know the screen has worn out.
You'll know when the wire breaks because it will pass no current.
You could use a simple circuit to sound an alarm or light an indicator, or transmit a signal or anything else..
and the cct could be embedded too.
The circuit to embed would be a simple thin wire...
If the wire breaks, then you know the screen has worn out.
You'll know when the wire breaks because it will pass no current.
You could use a simple circuit to sound an alarm or light an indicator, or transmit a signal or anything else..
and the cct could be embedded too.
Right.. my point was, it's not really a "current detector", more just a wire that will form part of your circuit.
You just need a transmitter circuit which is normally off, but when a wire in the circuit is broken, you wish the transmitter to turn on.
You could use a transmitter like**broken link removed** as an example.
You'd need a circuit which sends power to the module when the wire breaks, and that circuit could be a MOSFET switch. For an example, see the first diagram here. Replace S1 with a resistor (e.g. 10Mohm), and replace the R1 with your wire. Your transmitter module would be where R2 and D1 are. You may also wish to send pulses instead of a contunuous RF signal, so you'd also need an oscillator, maybe based on a 555 circuit.
Thanks for the help!
I was wondering if we can have a system where the transmitter remains "on" while current is flowing. Now, if we wish to check its status, it will reply back with affirmative when it is "on" or working. If current is cut out, then, we won't be getting any reply from transmitter which would infer that screen has worn out.
Is it possible to do?
I think you're saying that you want an indication that the transmitter is ok.
You could achieve that by connecting a battery directly to the transmitter. The transmitter has three pins - GND, +ve and INPUT.
Connect a 555 circuit to the INPUT pin. See **broken link removed**for a circuit. You want to use the 'astable' circuit on that page. This circuit generates pulses.
Now the circuit is continuously sending RF pulses, so you know that the transmitter is ok.
You could get a resistor (lets call it R3) and place it in parallel with R1 in that astable circuit.
Your detection wire would form part of this new resistor connection.
It will change the frequency of the pulses. If the wire breaks, then effectively R3 becomes
disconnected, and the frequency changes.
So, you have an indication that the transmitter is ok (if the transmitter fails, you will
get no pulses), and you have an indication that the wire is ok (if the wire fails, you will
get a different rate of pulses).
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