I’ve been trying to do this for weeks but in vain.
You guys know the jumper wires you use on breadboards? If you cut them, there are small, thin strands of copper wires in them (like less than 0.1mm diameter each). For part of a project, I want to pass enough current through ONE such strand to melt it.
The strand is about 4cm in length and has a resistance of around 2 Ohms. If I connect the strand to the terminals of a fully charged 9V alkaline battery, it melts in about 1-2 seconds. However, I want it to be faster and need to control it using Arduino as I need to also add LEDs. From what I’ve read, you can use a capacitor to do that.
In the diagram, I have represented the wire that needs to be melted by an Inductor. Also, I need to use a 9V battery to power everything (NOT the 2 AA batteries in the diagram).
Now, here’s how the operation of the circuit should be:
As soon as the circuit is switched on, the program is loaded and the Red LED will turn on (Pin 2 on Arduino), indicating that the circuit is ready.
The capacitor will be charged.
Then I can connect the wire that needs to be melted. As soon as I do, using DigitalRead or AnalogRead, I need to check if a wire is really connected (Pin 3).
If the wire is really connected, I need to switch ON the Green LED (Pin 4), indicating that I can start the melting process.
When the push button is activated, a large current is supposed to flow into the wire, causing it to melt. The Green LED turns off as the circuit is now open. Then I can remove the remnants of the melted wire and place another wire and repeat the process.
The problem I’m getting is that the wire is not melting, actually not even heating up. I am using a 100 microFarad Electrolytic capacitor. I am not sure what’s wrong. Should I use something more powerful like a 2S battery?
Also, I have tried melting the wire using the output from the Arduino pins but the current is too low to do so. That’s why I chose the 9V Alkaline battery.
Any help would be greatly appreciated.