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This project involves band that can be attached to your upper arm which will help you monitor your running habits by providing temperature and vibration feedback. The band produces a cold sensation when the user is not moving fast enough. The band vibrates if the user continues to be slow. An accelerometer is used to count the steps taken per interval. It also consists of two SPDT switches to switch on/off the device and to set the required foot step rate. The band runs from an Atmel ATmega1284P microcontroller, a Peltier Plate, vibration motor, and various control circuits. The accelerometer reading is fed to the controller which determines whether the user has taken a step or not. Based on the present and the previous reading, the step per interval is estimated which is then compared with the user set threshold and output in form of either peltier plate or haptic feedback is used depending upon the user speed. The Peltier plate control component is run by a PWM. The entire source along with the schematics used is well explained on… Continue reading

Accelerometer Interfacing with AVR

ADXL335 size

The article covers how to interface an accelerometer with the atmega32/atmega16. Before proceeding, the user must know the basics of ADC (Analogy to digital converter) of the AVR. An accelerometer is an electromechanical device that will measure acceleration forces. These forces may be static, like the constant force of gravity pulling at your feet, or they could be dynamic – caused by moving or vibrating the accelerometer. Accelerometers are of two types Analog and Digital. In this post, we will be discussing Analog accelerometer. They give voltage as output which is proportional to acceleration. The digital one gives the PWM output or direct binary digital data Continue reading

Easy Input – The Great Helper of Disabled People!

As a human being, we should be  glad that we’re born as a healthy person. Do you know that there are many unfortunate people that living helpless in this world? For helping those disabled people to overcome the difficulties in their life, a group of research from Cornell University School of Electrical and Computer Engineering has developed an intelligent stuff named, “Easy Input”. For your information, Easy Input is a head-controlled keyboard and mouse input device, especially for those disabled users. This system is a little bit different from others, as it uses accelerometers to detect the user’s head tilt in order to direct mouse movement on the monitor. This system is most suitable for paralyzed users, where the user can control the clicking of the mouse by blinking his/her eye through a reflective sensor. With the eye blinking, the user is able to scroll through letters with head tilt as the selection mechanism. Though, this project isn’t suitable for commercial device, as the head unit is still too large. Furthermore, the blink sensor also has to be mounted onto… Continue reading

RMS G Meter – The Powerful Accelerometer

RMS G Meter is considered as one of the useful acceleration measurer that ever created. RMS G Meter had been widely used in the following industries: Shipping – RMS G Meter is used for determine and verify the packages traveled with as little damage as possible. Manufacturing – It is used for vibration sensing for quality control purpose. The proper ways to calculate the RMS: Try to pick a function Then, square the function Remember to take the ‘mean value’ of the function Lastly, do take the square root of the function RMS G Meter is a smart microprocessor-based device, which can display and updates instantly the root-mean-square (RMS) values of the acceleration. There are six main components in a RMS G Meter: An accelerometer Low pass filter A/D converter Microcontroller LCD display Battery power supply We must know how to differential the four modes which: Peak Mode Once the PMS G Meter is activated, the device will update the highest RMS value it has measured. Average Mode The device will display the average RMS value of the signal all… Continue reading

AVR Tiny G-force metter

While stumbling around Hackaday projects I found this interesting G-Force measuring project. Project aim was to measure lateral acceleration force of driver in car when turns when he turns right. According to author car can normally handle 0.8g of centrifugal force. Above this value car may slide to the sideways. Well this of course is a matter of tires used and other factors.     Measuring board contains: Atmel ATtiny26 microcontroller; 3×10 LED bars; ADXL103 accelerometer; and other necessary parts needed for correct performance. Program reads accelerometer value via ADC converter and indicates on one of 30 LEDs on the bars. There is simple lookup table implemented which corresponds to 1g(left) on first LED and 1g(right) on LED 30. The middle LED indicates the current G-force. Design can be improved by adding filtering from noise and vibrations. Continue reading