Hard-to-Come-off Jumper Wire (Prototype)

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When using a breadboard for various purposes, one of the problems is that components may come off when you handle it roughly.

One of typical components that often come off is a jumper wire (also called a jumper code or jump wire). Have you ever been disappointed that a jumper wire has accidentally come off from the breadboard while you build the circuit by trial and error and you could never find out where it has been inserted?

We just thought that a hard to come off jumper wire may save you from such a sad accident, so we made one.


It’s so hard to come off that a 315g tea pet bottle can be hung. With the bottle hung, it is electrically connected so the yellow LED is on.

This jumper wire is a prototype; althoguh its features of hard to come off and usability are limited, the structure is very simple and anybody can make it easily. We will let you know when we are successful in creating easier-to-use ones in the future.

Now, we’d explain the structure of the hard-to-come-off jumper wire (prototype) and how to use it.


They appear to be almost same as the conventional ones, but why are they so hard to come off?


That’s because…the tip is curved like a claw. When you insert it into the breadboard,


You have to lay it along the shape of the claw and insert it while standing it up gradually. Insert the other side, too.


Do the opposite to pull it out. Pull out while tilting it.


Compared to the usual jumper wire, there is one functional restriction. The claw occupies the next hole so you can’t use the next hold in many cases.通


It’s a bit hard to see, but the claw is bent to the right side and gets into the clip next to it. If you insert this type of jumper wire into a hole where there is other component inserted next to it and fix the jumper wire, electrical connection for the neighboring component may be lost. Or, if you insert other component after inserting the jumper wire, the component may not be inserted properly and electrically connected. You have to be careful not to insert the jumper wire into a hole right next to other component as shown in the image. Instead, insert it at least one hole away.


To know which side the claw is bent to, see the mark near the pin of the jumper wire. You can determine the layout of the part carefully by checking the mark.


Now, let’s pull the jumper wire at various angles to prove how hard to come off it is.そ


We’ve inserted the blue jumper wire with a claw into the above circuit with the LED, and hung a 175g tea bottle from the jumper wire. You can see two blue wires, and the load is applied to the left one. We checked that the LED has been on without a break, while checking the voltage at the blue jumper wire on the tester to confirm that there was no bad connection. Any value beyond 1.74~1.75V indicates disconnection. As it is moved slowly, we should notice instantaneous disconnection on the tester.


Here is the video of the experiment. We changed the direction at about 45 degrees to the left and right, and no disconnection was observed.

We had a good feeling that it can be used as for now. The jumper wire wouldn’t be pulled so much in the first place, so we’ll use it for a while.

We’ll do more tests on the future commercial version product.

We’ll report on the usability again when we prepare a sample!!

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