Recoil gaming mouse. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Computers

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In Logitech terminology, this is iFeel - the issuance of vibration of various amplitudes and rhythms. Somehow, having read reviews, I bought a Logitech iFeel MouseMan and tried to play - it's hard to imagine a greater disappointment. The mouse is heavy, uncomfortable, iFeel is inexpressive. Half an hour later, the brush ached, which had never happened before. It was a long time ago and I safely forgot this terrible dream. You can read more about Feedback" technologies at immersion.com. Recently, I caught the eye of a vibrating alert from some cell phone and had an idea - to get a similar effect, but without the terrible Immersion drivers. I made a circuit that filters low-frequency components and sends them to vibrate.

The circuit consists of two parts - a low-pass filter (LPF) on the first half of the LM358 and a rectifier amplifier on the second half of the LM358. LPF is made on C3, R3, C4, R4; the circuit R1, R2, C1 sets the bias 1/2 of the supply for the normal operation of the filter. Resistor R9 regulates the signal level. Capacitor C2 removes the DC component and an AC voltage with zero on the ground comes to the rectifier input. This is very convenient, because it is necessary to get at the output not a variable, but a rectified signal. The rectifier takes feedback from the output, which reduces the harmful effect of the vibrating alert. I have used a vibrating alert with an internal DC resistance of 30 ohms, operating voltage 3V. The rectified voltage is not smoothed out by capacitors and this is done on purpose - so there is less inertia and somehow the rhythm, shape and frequency affect the nature of the vibration.

Capacitors and resistors can be anything, only C3 must be with a small leakage current, i.e. not electrolytic. Transistor Q1 any npn, Q2 any pnp but with "average" collector current (0.3-2A). It’s better not to put it on Q2 completely low-current, because it provides a vibrating alert current. The vibrating alert itself is 3-5V with a not very large current, because USB power is not unlimited. I have the whole circuit placed in the mouse itself, the level control is at the bottom left and does not interfere with the game, which is convenient for adjusting during the game. The vibrating alert is glued to the inside of the top cover of the mouse, there is also a diagram. Pressing the vibrating alert may not provide a reliable mechanical connection, because the vibration level is very significant. When adding the circuit, the total weight of the mouse remained almost unchanged.

Once upon a time, I extended the mouse cable with a braided lead, now one of these leads is used for audio signal transmission. I made a braided wire because the wire is softer and almost invisible when playing. To connect to a sound card, you will have to make an extension adapter and remove the signal from it to the mouse. You can take it from the left or right channel, or you can use their half sums - I put a 10K resistor in each output (left and right), and connected the middle point to the mouse. It is better to lead the wire from the sound card to the mouse with a shielded cable, ground its screen on the side of the sound card and in no case connect the mouse to the ground! If this is not done, then you can get a high level of noise and interference in the sound card.

This method has a lot of disadvantages:

• long time before vibration starts (vibrating alert mechanical inertia)
• an even longer after-sound time at the end of the sound.
• small range of vibration volume levels.
• when the power is turned on, it vibrates for 1-2 seconds. It can be eliminated by some complication of the circuit.

Some advantages:

• very light design, practically does not weigh down the mouse
• fairly simple circuit
• lack of drivers, patch'ey and other things.

There are games in which the vibration effect is better, and there are those where it is unsuccessful. "I would classify UT and UT2003 as the first, the rest in different ways." Recommendation - make the volume of the music 2 times quieter than the effects, then the music will not cause vibration. By the way, an interesting effect turned out along the way - when in Chrome I went into the engine room with constantly clanging units, the mouse began to vibrate. The circuit was assembled a few days ago, and when they took it from me to see, I clearly felt that something was missing. "It's such a trifle, but I'm already used to it. For further development, we need to try replacing the vibrating alert with a vibrodynamic. This linearizes the vibration levels and the vibrations themselves will become more correct ", but the possible weight of the structure is alarming.

Based on materials from the site Overclockers.ru

Author: Serj; Publication: cxem.net

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