This is again a final year project by Melissa and her team, who all are students at Cornell University. The electrical part of the project consists of Galvanometer and the microcontroller which acts as an input to the position detector sensor and also are responsible for control loops which have been implemented using proportionate derivative controller. The mechanical part consists of a combination of different devices which makes up the laser projector. A part of the software runs on a Linux based PC which handles file parsing, point scanning, frame display, and serial transmission to the control board.
For this laser projector, the moving and still parts of the galvo are switched around. The current running through the coils causes the rotary motion of the magnet, and subsequently, both the position detector electrode and the mirror attached to the ends. The project have been designed keeping in mind that further research and development should take place on a similar concept. The project schematics needs a little bit of improvement as accessing the board is a challenging task. A different project but still a long way to go before we see something like this in the market.
This project will definitely be liked by people who loves playing air hockey. In short term, it’s a low cost robot which detects a puck coming towards it and moves in its required direction to stop it. The great point of the project is, it’s highly responsive and doesn’t use any robotic arms to stop the puck. The heart of the project, an ATMEGA 1284 MCU, takes in echo patterns from each of the sensors, interprets them and accordingly actuates the robots motors. Moreover, it requires negligible human input and can also be powered from a battery based source.
Due to multiple tasks running simultaneously, they have used a tiny real time kernel to execute task in a coordinated manner which has made the robot more responsive to the puck. In the final design, with all the sensors mounted on the robot, a threshold of about 34cm or 1 foot was observed to do the best job of detecting the puck and resulting in proper functioning of the robot. A low cost robot doing a job of the goalie in an very efficient way. However, since the puck is round in shape, there have been certain difficulties in picking it up due to echo not being reflected back.
Mobile phones are a modern staple of most people’s lives today. Social media and technological innovation have made them crucial to corporate and private life, so when you lose signal on your device, it could throw your entire day off. WiFi isn’t always available in the workplace. Sometimes architecture of a building or a campus thwarts signal coming from nearby.
Sometimes an individual lives in a community primarily rural, and may only have several towers servicing several thousand. It’s easy to fall through the cracks in a world of seven billion, and though cellular companies work round the clock to increase signal, sometimes there’s just no way to ensure all constituents in all areas will be able to have stellar service all the time. The solution is to give clients the power to boost their signals personally. Mobile phone booster technology is a great way to bring signal to rural or industrial areas where it just can’t be found, and there are many reasons it could come in handy. But just what is it? Continue reading
Arduino have evolved into popular development platform with variety of boards, shields and strong community. It’s simplicity and robustness allows tweaking, designing and building things even if you have are little or no experienced in electronics and microcontrollers. Today Arduino comes in many different shapes and processing power. Gearbest team was so kind to supply Arduino Mega 2560 R3 featuring ATmega2560 microcontroller. This is most powerful AVR based Arduino having 54 I/Os, 256KB flash, 4KB of SRAM and 4KB of EEPROM.