Advice 1: Why is the laptop not working touchpad

The touchpad on laptops is a good thing, but not for all convenient. If used, it will be even better mouse. However, there are cases when it ceases to function.
Why is the laptop not working touchpad

What is touchpad?

The main "trick" of working with a laptop is that it does not have to connect a mouse to control the cursor in laptops using the touchpad, which is also called the touchpad. But there are situations when the touch panel breaks down, and normally work with the laptop does not work.

The touchpad is the touchpad, which responds to the movement of the user's finger and moves the cursor. First, this device seems to be awkward, but you quickly get used to it, and it seems that it is even a better computer mouse. But this is the main problem – the user gets used to the touchpad, and the mouse no longer enjoys. And then suddenly the touchpad stops working. And mouse at hand. And what to do in this case?

Looking for the cause of failure of the touchpad

Most often, the touch pad stops to respond to touch because of the pollution. Cleaning the touchpad is carried out using soapy swab, after that it should be wiped with a damp cloth and allow to dry. Do not forget that the panel does not respond to oily or wet hands.

Also the problem with the panel can occur when the settings adjusted too high sensitivity. To change these settings in the "Mouse" control panel.

If not working not the entire panel, and some of its functions – scrolling or moving the cursor it is necessary to check the touchpad drivers. For this, you need to go to the shortcut properties of "My computer" and select "device Manager". If the touchpad there does not seem – possible that the driver had not been installed. To find the driver on the disk that comes with the laptop or on the manufacturer's website. It is very important that the version of the driver was higher than 1.0. Quite often, the standard drivers are installed correctly.

If the touch pad does not work in General, then you first need to check the most simple things. For example, the touchpad may just be disabled. To include a touch panel in several ways:

- use a combination of Fn+ one of the keys F1 through F12;

- use the button to enable/disable touchpad (if any);

- enable the touchpad with the utility, which is hidden in the tray;

- disable the mouse, that the machine will include a touchpad.

Finally, the last option is that the touchpad is broken. Over time, everything breaks down.

So, in order to identify the cause of the malfunction of the touch panel it is necessary to exclude first the most simple cause, and if nothing helps – then you need to contact the service center.

Advice 2 : How to turn on the sensor

The sensor is the device that replaces a button which is not from depression but from touch. It can be electrical or optical. The method of inclusion depends on the physical principle of action.
How to turn on the sensor
Sensors that respond to leads, work only in areas where there is a network of alternating current. When in this room there is a man, his body is like an antenna perceives the radiation of the transaction. When you touch the sensor on his body the induced voltage is detected and causes opening of the transistor. To get this sensor to work, fabricate the diode detector voltage doubler. The entrance will connect to the sensor and the output to the base of transistor operating in key mode and is included in the circuit with common emitter. Load use high resistance, otherwise the transistor will not be saturated. When you touch the sensor on the detector output appears a DC voltage between the base and the emitter of the transistor to be electrified, and it opens. The voltage between its collector and ground will fall to zero.
Sensors consisting of not one, but two plates, triggered by snapping a finger on one of them to another. Between the plates connect the Zener diode in the polarity reverse to the polarity of the supply. A voltage stabilizing Zener diode should be about 20 V. One plate connect to the common wire, the second via resistor 10 kω to the input of logic element chips K561LN2. Also connect the same input to the bus power supply CMOS logic through a resistor of 10 Megohms. Now, if you do not touch the plates, the output will be a logical zero, and with the closure of the plates - a logical unit. This sensor will work indoors where there is no electrical wiring.
In the past limited the use of touch devices, responsive to failure of oscillation of the generator when you touch the plate. If you wish to build such a device now. Take as a basis the scheme of any capacitive relay. Is the antenna plug the sensor, but not directly, but via a resistor of 1 Mω. Choose its value so that triggering occurred only when touching the plate, but not when approaching it.
The optical sensor is an optocoupler with open optical channel. Emitting diode of the optocoupler will be connected to a power source through a resistor, chosen so that the current in the circuit was equal to the nominal diode. The emitter of the phototransistor of the optocoupler connect to the common wire, the collector through a resistor of 1 kOhm to rail CMOS logic. In addition, attach the collector to the input of logic element chips K561LN2. A logical unit at the output of this element will be replaced by a zero in the interruption of the light flux with your finger. To make a logic operation of the device back, use another logical element of the same chip.
Use the sensors only in devices with a transformer or battery powered. At the same time do not touch the sensor and grounded objects.
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