Dc motors and servo motors are essential components for robotics projects. And most of the robotics projects become really interesting when the projects are wireless also. The most common wireless technology used till now was the FM or RF technology. But there are many disadvantages to using such analogue communication technologies.
Bluetooth is a short range digital communication protocol suitable for robotic projects. The remote control consists of a receiver and a transmitter. In this case we can use a standard bluetooth module as the receiver. The transmitter may be custom made from a bluetooth module, or a small program can be written on any smart phones with bluetooth capability. J2me and windows mobile are the best for this purpose. Symbian also can be used.
Bluetooth is a short range digital communication protocol suitable for robotic projects. The remote control consists of a receiver and a transmitter. In this case we can use a standard bluetooth module as the receiver. The transmitter may be custom made from a bluetooth module, or a small program can be written on any smart phones with bluetooth capability. J2me and windows mobile are the best for this purpose. Symbian also can be used.
Remote controls can be hacked. Especially the ones that use RF with out any encoding schemes can be hacked very easily. Keyless entry for cars, garage doors etc are the ones which are more venerable to attack. Attackers use custom made handsets which mimick the frequency of the original handset to get the attack done. Rolling code security mechanisms are used to protect wireless remotes from such attacks.
The idea is to use a synchronised code. The transmitter and receiver agrees on a particular code for the next transmission. If only that matches in the next transmission will it be accepted. After every successful transmission the code is changed by either the transmitter or the receiver and is then synchronized. In this method no other handset can communicate with the receiver with out knowing the code. The only draw back of this system is that only one handset can be used.
The idea is to use a synchronised code. The transmitter and receiver agrees on a particular code for the next transmission. If only that matches in the next transmission will it be accepted. After every successful transmission the code is changed by either the transmitter or the receiver and is then synchronized. In this method no other handset can communicate with the receiver with out knowing the code. The only draw back of this system is that only one handset can be used.
A weather dashboard is a display screen which will show weather information and forecasts for a particular area. The information can be fetched from a local server or a server in the internet. Here the project idea is to make a home weather dash board which shows the weather forecast for the current place and also the current situation. The dash board is basically a TV or an LED matrix display.
There will be an embedded system controlling this and the system is wifi. The device will fetch information from the server via the wifi internet connection and then it will format it and display it. The components needed are an access point, a serial to ethernet convertor and powerful microprocessor to handle the complex signals in the case of images.
There will be an embedded system controlling this and the system is wifi. The device will fetch information from the server via the wifi internet connection and then it will format it and display it. The components needed are an access point, a serial to ethernet convertor and powerful microprocessor to handle the complex signals in the case of images.
Key less entry is gaining popularity among luxury cars these days. Toyota cars are equipped with keyless entry. In some luxury cars there is no key at all. The driver will carry a small RF device which will transmit a beacon. The receiver in the car can detect this beacon. The receiver is capable of determining the distance of the rf key. The security systems of the car will be deactivated only if the RF key is within a certain distance from the vehicle. Old systems used plain RF communication to make this possible.
But car thief’s became smarter and they started hacking those systems. The next generation featured encoded signals, but they were also not very helpful. Now most of the systems are hybrid ones which cannot be hacked very easily. Modern keyless entry systems feature bluetooth, zigbee etc which can be controlled from mobile phones also.
But car thief’s became smarter and they started hacking those systems. The next generation featured encoded signals, but they were also not very helpful. Now most of the systems are hybrid ones which cannot be hacked very easily. Modern keyless entry systems feature bluetooth, zigbee etc which can be controlled from mobile phones also.
A thin air mouse glove is a glove that can be used as a pointing device. The is no mouse pad or hard surface, the user wears the glove and waves his hand in thin air and the cursor on the screen moves. The device is basically an accelerometer which measures the acceleration in various directions. All the readings from the accelerometer are taken and the direction of motion is calculated.
This is transmitted to the PC or the host machine via an RF link of a bluetooth link. The PC uses that data to move its mouse cursor. This technology can eliminate costly touch screens which are usually misused by public. Accelerometer mouse can also be very useful in certain industries where touchscreen deployment is not possible.
This is transmitted to the PC or the host machine via an RF link of a bluetooth link. The PC uses that data to move its mouse cursor. This technology can eliminate costly touch screens which are usually misused by public. Accelerometer mouse can also be very useful in certain industries where touchscreen deployment is not possible.
