Hello, this is the scenario. I am developing an interactive installation that is triggered only if you are holding another human hand. So I'd like to put 2 handle bar and if two person hang the bars a trigger is spawned. I can detect the human touch easly with capacitive sensor, but the problem is that I must detect if the circuit is "closed" by a human chain.
Thank you for your help.
You have to establish a circuit, before you can close it.
That can safely be done with humans using a very low voltage, very low current power supply attached to the two ends of the human chain. If current flows, the circuit is closed. Your problem would be to establish reliable connections at the two ends.
you are telling me to use humans simply as a switch? detecting the current flow?
Yes, but you said it first.
If "POWER +" is the Arduino 5V output, that would be OK.
For "LOAD", I would substitute a 1 MEG resistor in parallel with a 100 nF capacitor.
To help protect the ADC input, put an additional 10K Ohm resistor in series with it.
This circuit will undoubtedly give false triggers in an electrically noisy environment, for example where humans insulated from the ground pick up household AC signals via capacitive coupling to overhead fluorescent lights, etc., then touch "Input".
Thank you so much... Another question: which is the purpose of the capacitor? To have a much stable signal? In this case I can have less noise signal over the responsiveness of the trigger, isn't it?
Yes.
In addition, the ADC requires the source impedance to be lower than 20K Ohms.
Thank you so much! This weekend I will give a try.
Can you isolate the two bars so you detect a person on each one separately?
I am designing the installation by putting the bars that can be touched simultaneously only by two or more people...I'd like to force people collaboration for a common task
What happens when they do hold hands?
There was the same sounding project being asked about a month or two back.
Seeing how this input voltage is 5V and as a kid you probably had a train set or racing cars that had 12V on the rails then if you want to electrocute yourself you will have to figure that out rather than the other way round.
A good way to do this would be to have some thumb tacks stuck all around the two handles so you puncher the skin as you grasp them. Then make sure there is blood contact between the two people cooperating. That should do it. It will ad a bit of a Goth feel to the exhibit.
I've done something similar thanks to the help of this forum.
This is the circuit I've used which was working just fine.
a voltage divider is formed between A0 and GND when the two humans holds their hands and each of them holding the wires. When no hands are held A0 is reading +5V (1023) as it pulled to +5V via R1. when circuit is closed via the humans that holds the hands and wires 1 and 2 A0 will read values close to 0V.
thank you for sharing. I will give a try in the next iteration
Can u pls tell that you need a project when a human shake his or her hand or if human detected not sure what do you want to make and if so what process after you want like a beep of buzzer on turning on LED or something else
This circuit is for an artistic installation. To enjoy a content from a screen you must hang a terminal and another human hand. I'd like to "force" a collaborative behavior....
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