Saelig Co. Inc. announces the availability of the PS25203 EPIC Sensor (Electric Potential Integrated Circuit) for a wide range of contactless ECG and movement sensing in automotive applications, including driver fatigue monitoring and seat occupancy. The EPIC sensor is a completely new, award winning, patent-protected sensor that can rapidly measure electric potential sources such as electrophysiological signals or spatial electric fields.
The EPIC Sensor revolutionizes the way movement sensing, medical ECG/EEG/EOG, proximity non-touch switching, or even gesture recognition signals are taken in vehicles. It can be used as a dry contact ECG sensor without the need for potentially dangerous low impedance circuits across the heart. By detecting changes in the electric field, the EPIC sensor can also drive a relay to act as a simple non-touch electric switch. The EPIC sensor can be employed in a proximity mode or to detect specific kinds of movement as a gesture recognition device.
PS25203 EPIC Sensor – For Low-cost Automotive Detection Systems - [Link]
Raj from Embedded Lab talks about constructing a reflective IR sensor with necessary instrumentation circuit to illustrate the principle of photoplethysmography as a noninvasive technique for measuring heart rate. This project uses the TCRT1000 reflective optical sensor to sense the blood variation in the finger tissue and outputs a digital pulse which is synchronous with the heart beat. The output pulse can be fed to either an ADC channel or a digital input pin of a microcontroller for further processing and retrieving the heart rate in beats per minute (BPM).
DIY Photoplethysmographic sensor for measuring heart rate - [Link]
The MAX44006/MAX44008 integrate six sensors in two products: red, green, blue (RGB) sensors; an ambient light (clear) sensor; a temperature sensor; and an ambient infrared sensor with an I²C interface. These highly integrated optical sensors include a temperature sensor to improve reliability and performance.
The devices compute the light information with six parallel data converters allowing simultaneous light measurement in a very short time. The devices consume only 15µA (MAX44006) and 16µA (MAX44008) separately in RGBC + TEMP + IR mode, and also have the ability to operate from 1.8V/3.3V/5.5V supply voltage rails.
RGB Color, Infrared, and Temperature Sensors - [Link]
DHTxx Sensors @ The Adafruit Learning System:
This tutorial covers the low cost DHT temperature & humidity sensors. These sensors are very basic and slow, but are great for hobbyists who want to do some basic data logging. The DHT sensors are made of two parts, a capacitive humidity sensor and a thermistor. There is also a very basic chip inside that does some analog to digital conversion and spits out a digital signal with the temperature and humidity. The digital signal is fairly easy to read using any microcontroller.
DHTxx Sensors Tutorial - [Link]
The MAX44004 is a wide dynamic range, low-power ambient light sensor (ALS) ideal for many light sensing applications: tablets, displays, accessories, medical devices, and light management systems.
The on-chip ambient sensor has the power to measure the exact visible light from 0.03 lux to 65,000 lux and communicate through an I²C digital communication bus. The IC has patented sensors, filters, and circuitry to mimic the human eye response. With on-chip calibration registers, it performs the same in different light conditions (i.e., fluorescent, incandescent). The interrupt pin minimizes the need of constant polling of the device, freeing up microcontroller resources for efficient communication and thus reducing overall power consumption. The part-to-part matching is optimized by proprietary Maxim process to speed up end-product development time.
MAX44004 – Digital Ambient Light Sensor - [Link]
This temperature measuring project has a variety of range from -55 to +125 degree centigrade indicating on four common anode seven segment display module.The project measures an accurate temperature value point to point.
The main sensing part of the project is the semiconductor DS1820.It is based an one wire protocol device manufactured by Dallas semiconductor comes in different resolution such as DS18 S20(9-bit resolution), DS18B20 (12-bit resolution) etc.A microcontroller(AT89C2051) controls whole circuit function like receiving the serial data from DS1820 and converting the value for displaying the seven segment module.
DS1820 Digital Thermometer - [Link]
Project is about a method to measure level of liquid using pressure sensors. Though not a new idea, the design has been done with following features in mind, Scalability, Cost, Feature Set
Non Contact Wireless Liquid Level Gauge - [Link]
raph @ raphnet.net writes:
USBTenki is an electronic project to interface sensors to an USB port for collecting weather related data such as temperature. The firmware supports many different sensors and interfaces. It is up to you to decide what your USBTenki will support.
USBTenki: USB Temperature sensors and more - [Link]
Eric Schmiedl writes: [via]
Like an EEG and an EKG, it measures the electrical impulses that make the human body work. Whereas an EEG measures the brain and an EKG the heart, an EMG looks at electrical activity over the rest of the body — which pretty much means the muscles.
To get your muscles to contract, the nervous system sends electrical pulses into the muscle fibers, which amplify those pulses and send them on to other fibers until the whole muscle is moving.
Simple DIY EMG sensors - [Link]
Physicists from the University of Utah have developed an inexpensive, highly accurate magnetic field sensor of a new kind. The new magnetic-resonance magnetometer resists heat and degradation, works at room temperature and never needs to be calibrated. A disadvantage of the sensor is that it is slow, taking up to a few seconds to detect a magnetic field.
The sensor is based on an organic semiconductor polymer named MEH-PPV which is really nothing more than a dirt-cheap orange-colored electrically conducting, magnetic field-sensing plastic paint. Only a drop of it can be used to measure magnetic fields highly accurately, which costs just as little as drop of regular paint. The sensors make use of spintronics, in which data is stored both in the electrical charge of atomic nuclei and in what is known as the “spin” of those subatomic particles. Described simply, spin makes a particle behave like a tiny bar magnet that is pointed up or down within an electron or a nucleus. [via]
A ‘Dirt Cheap’ Magnetic Field Sensor from ‘Plastic Paint’ - [Link]