sensor

Scan E

Scan-E: An optical blood pressure sensor Using Atmega1284

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Introduction For this project, we created a noninvasive heart rate and blood pressure measurement tool with the intention of gathering data for large-scale analysis for the automatic prediction of heart disease. In modern society, patients often have access to a wealth of electronic data concerning their social networks and surroundings, but have little personalized insight …

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Acoustic Wayfinder

Acoustic Wayfinder Using Atmega1284

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Our acoustic wayfinding device utilizes ultrasonic range finders and haptic feedback to facilitate indoor navigation for the visually impaired. The technique of acoustic wayfinding uses auditory cues, such as sounds from the natural environment or sounds created artificially, to determine an individual’s surrounding physical space for the purpose of navigation. Our device is an automated …

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Street Lights

Street Lights that Glow on Detecting Vehicle Movement Using Atmega

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Street lights are switched on depending on the intensity of the Sun light on LDR. If the intensity of Sunlight on light dependent resistor is low, its resistance value is high. This value increases and becomes high when it is completely in dark. This resistance value decides when the street lights are required to switch …

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TW Devices

Working with TWI (I2C) sensors / Devices Using Atmega

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Introduction The I2C is a multimaster, multislave serial single-ended computer bus and was invented by Philips in 1982. The atmel microcontrollers use a compatible  to I2C serial bus that is named TWI (Two Wire Interface). The  TWI supports serial communication at 100 kHz and 400 kHz. The master and slave devices that are connected to TWI bus have a …

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Flex Sensor Interfacing

Flex Sensor Interfacing with AVR Microcontroller Using Atmega

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In this tutorial we are going to interface FLEX sensor with ATMEGA8 microcontroller. In ATMEGA8, we are going use 10bit ADC (Analog to Digital Conversion) feature to do this job. Now the ADC in ATMEGA cannot take a input more than +5V. What is a Flex Sensor? A FLEX sensor is a transducer which changes its resistance when its shape …

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Schematic Cheap CO2 meter

Cheap CO2 meter using the MQ135 sensor with AVR ATmega

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MQ135 is an Air Quality Sensor suitable for detecting of NH3, Alcohol, Benzene and other gases. The description below, is what i derive from the poor datasheet of this sensor, it may be uncorrect, so if you have suggestions please leave me a feedback. The “sensitivity characteristics of the MQ-135” figure of the datasheet, you can see it …

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PID magnetic levitator.

An AVR Atmega based PID magnetic levitator

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This is a magnetic levitator implemented using Atmega8 microcontroller. Magnetic levitation is a method by which an object is suspended with no support other than magnetic fields. To make a magnet levitate, an hall sensor is attached to a coil. The coil acts as an electromagnet, and the hall sensor measure the distance of the magnet from the coil. …

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An optical dust meter

An optical dust meter that uses the GP2Y1010AU0F sensor library made with AVR Atmega

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This project is a dust detector that use the GP2Y1010AU0F sensor. Attached you can also find the GP2Y1010AU0F sensor library for AVR Atmega. GP2Y1010AU0F is a dust sensor by optical sensing system. An infrared emitting diode (IRED) and an phototransistor are diagonally arranged into this device. It detects the reflected light of dust in air. Especially, it is …

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