Mod Mouse ( Version 1 )

Author: Rob

Personal introduction: This article has mainly been focused on the successful Half Life Mod, Counter Strike. However, this isn't saying that it can't be used with other applications, but seeing I'm a Counter Strike fan I don't care about any other programs as long as I get my extra frags in. Extreme ICE or I will not take responsibilities for any damaged caused to yourself or your equipment if you produce this modification.

Question: what is the mod that I'm going to "try" and "successfully" build?

Answer: automatic fire button for the mouse.

The reason for wanting an automatic fire button in Counter Strike is to be used with pistols, where rapid action of the firing is required to equal the amount of damage that a secondary weapon would cause. However, if the fire button is on your mouse then you'll know that the finger tires very quickly or not fast enough to unload those bullets into your opponent.

For me (and most people), my fire button is the left mouse button (unless your left handed then it's the right button) so we need to take a closer look at this and see how it could be modified.

The standard voltage across a mouse button switch is about 5 volts, same as the supply voltage to the mouse itself. So to cause a "trigger", the button has to be physically pressed to close the circuit, which allows the 5 volts to flow through. For another "trigger" to occur, the 5 volts has to cease and then be applied again, this is where the idea of an oscillator comes in.

The idea of having an oscillating circuit patched in the mouse allows the process of "101" to occur automatically, rather than physically pushing, releasing and pushing again to have the same output.

There are many ways to create a Square Wave-form or Astable, but I'm going to look into the least complicated way of producing this circuit. For UK people (might apply to other countries as well) we have the delight of the integrated circuit (IC/chip), 555N, this little 8 pin chip is a general purpose timing unit and can be wired to do a lot of applications, one of them being an Astable output. Below is a diagram of this IC and how it can be wired to process an Astable function.

In total 4 components are required (1 IC, 2 Resistors and 1 Capacitor), this is ideal because its compact and cheap to make. As well as those two benefits, the circuit is relatively simple to solder on a piece of Stripboard, below is a picture of one of these.

So the general idea of the article is forming, now its time to take a closer look.

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