by Paul Galluzzi @ edn.com:
The Fig 1 circuit uses a Hall-effect sensor, consisting of an IC that resides in a small gap in a flux-collector toroid, to measure dc current in the range of 0 to 40A. You wrap the current-carrying wire through the toroid; the Hall voltage VH is then linearly proportional to the current (I). The current drain from VB is less than 30 mA.
To monitor an automobile alternator’s output current, for example, connect the car’s battery between the circuit’s VB terminal and ground, and wrap one turn of wire through the toroid. (Or, you could wrap 10 turns—if they’d fit—to measure 1A full scale.) When I=0V, the current sensor’s (CS1’s) VH output equals one-half of its 10V bias voltage. Because regulators IC1 and IC2 provide a bipolar bias voltage, VH and VOUT are zero when I is zero; you can then adjust the output gain and offset to scale VOUT at 1V per 10A.
Current monitor uses Hall sensor - [Link]
Chris Holden of Nerd Club has build a temperature controller with a simple menu system:
After what seems to have been a very long time, it was nice to poke more wires into a breadboard and make something actually useful for a while! Here’s a simple temperature monitor for our injection moulding heater block. It uses three buttons for setting the parameters and some pretty dodgy-looking routines to detect “short” and “long” presses.
Temperature controller for K-type thermistor and MAX6675 - [Link]
The design is small scale mobile robot. The robot has two wheels that optimizes direction control and rotation. It is simple and low cost compared to other robotic designs. It is accurate and reliable with three sensors, which accuracy can still be increased with additional sensor pair.
The circuit is comprised of an Arduino Uno microcontroller, which serves as the main board of the system. It handles the complete integration of the system. The distance sensors serves as the eyes of the robot, which are three pairs for accuracy and faster obstacle sensing. The motors drives the two wheels independently, each has its own wheel to drive. The transistors that is connected to the motor are used as a switch of the motor as the microcontroller releases the signal.
This simple design of mobile robot is helpful in order to developed our own version of mobile robot. It is an efficient and helpful concept in developing a robot that can roam around especially without the need of human control. It is suitable to different applications like gathering data, search and rescue, safety measures, and other related stuffs that needs support at a very rigid situation.
Basic Mobile Robot with Autotravel Configuration - [Link]
The OPT3001 is a sensor that measures the intensity of visible light. The spectral response of the sensor tightly matches the photopic response of the human eye and includes significant infrared rejection.
The OPT3001 is a single-chip lux meter, measuring the intensity of light as visible by the human eye. The precision spectral response and strong IR rejection of the device enables the OPT3001 to accurately meter the intensity of light as seen by the human eye regardless of light source. The strong IR rejection also aids in maintaining high accuracy when industrial design calls for mounting the sensor under dark glass for aesthetics. The OPT3001 is designed for systems that create light-based experiences for humans, and an ideal preferred replacement for photodiodes, photoresistors, or other ambient light sensors with less human eye matching and IR rejection.
OPT3001 – Ambient Light Sensor - [Link]
Silicon Labs introduced a new family of high-precision temperature sensors offering industry-leading power efficiency. Silicon Labs’ ultra-low-power Si705x temperature sensors consume only 195 nA (typical average current) when sampled once per second, which minimizes self-heating and enables multi-year coin cell battery operation. Unlike traditional digital temperature sensors, the Si705x devices maintain their accuracy across the full operating temperature and voltage ranges and offer four accuracy levels up to +/-0.3 °C. The sensors are ideal for HVAC, white goods, computer equipment, asset tracking, cold chain storage, industrial control and medical equipment. AEC-Q100-qualified versions are also available for automotive applications.
Traditional approaches to temperature sensing that use thermistors or embedded MCU temperature sensors suffer from poor accuracy and higher power consumption. Although improved accuracy can be achieved through end-of-line calibration, this technique presents additional manufacturing costs and challenges while accuracy is still susceptible to variations in power supply voltage. In contrast, the Si705x sensors’ patented signal processing technology provides stable temperature accuracy over the entire operating voltage and temperature ranges without the need for costly end-of-line production calibration. In addition, the integrated low-power analog design delivers an optimal price/performance solution with up to 35 times better power efficiency than competing temperature sensor products.
New Vishay Intertechnology IHLP® Inductors in 2020 Case Size Offer High-Temperature Operation to +155 °C - [Link]
The HDC1008 is a digital humidity sensor with integrated temperature sensor that provides excellent measurement accuracy at very low power. The device measures humidity based on a novel capacitive sensor. The humidity and temperature sensors are factory calibrated. The innovative WLCSP (Wafer Level Chip Scale Package) simplifies board design with the use of an ultra-compact package. The sensing element of the HDC1008 is placed on the bottom part of the device, which makes the HDC1008 more robust against dirt, dust, and other environmental contaminants. The HDC1008 is functional within the full –40°C to +125°C
HDC1008 – Integrated Low Power Digital Humidity Sensor with Integrated Temperature Sensor - [Link]
by Susan Nordyk @ edn.com:
Based on 1.1-µm pixel technology, the AR1335 CMOS image sensor from ON Semiconductor provides 18% better sensitivity than previous-generation devices, along with increased quantum efficiency and linear well capacity to enable near-digital still-camera quality and low-light imaging on smart-phone cameras. The sensor’s pixel and color filter processing increase sensitivity, allowing more light to be captured to improve image quality, especially in low light.
The AR1335 offers crisp 13-Mpixel resolution with high-quality zoom and sharp reproduction of scene details. Professional video quality is supported through 4K ultra-high definition and cinema formats at 30 fps and full HD 1080P at 60 fps. On-chip camera functions include windowing, mirroring, column and row skip modes, and snapshot mode. In addition, a 32° chief ray angle makes the sensor suitable for low z-height applications.
The AR1335 is now in mass production in die format. It has been designed into several smart phone models, with availability in leading phones expected by the second quarter of 2015.
Sensor enables low-light imaging for smart-phone cameras - [Link]
Vishay Intertechnology is broadening its optoelectronics portfolio with the introduction of two new automotive-grade high-speed silicon PIN photodiodes in top-view, surface-mount packages measuring 5 mm by 4 mm by 0.9 mm. Offering a large sensitive area of 7.5 mm2, the Vishay Semiconductors VEMD5010X01 and VEMD5110X01 provide high radiant sensitivity with a reverse light current of 48 µA and a very low dark current of 2 nA for automotive, industrial, and medical applications.
The AEC-Q101-qualified devices are manufactured using Vishay’s new foil assisted mold (FAM) technology. The photodiodes’ leadframe, bond wire, and connection pads are molded in a black epoxy, while a free cavity above the radiant sensitive area allows light to enter the package for signal generation. This design enables a smaller overall package size with a lower height profile, while maintaining a large radiant sensitive area. In addition, thermal stress on the bond is reduced for increased robustness and reliability.
Vishay Intertechnology Automotive-Grade PIN Photodiodes Deliver 7.5 mm² Sensitive Area in Low-Profile Packages - [Link]
Scientists have created a new generation of biosensors that could potentially allow machines to sniff out subtle differences in smell with more accuracy than our own human noses. From University of Manchester:
Every odour has its own specific pattern which our noses are able to identify. Using a combination of proteins coupled to transistors, for the first time machines are able to differentiate smells that are mirror images of each other, so called chiral molecules, something that has not been possible before. The human nose can distinguish between some of these molecules and the different forms of the same molecule of carvone, for example, can smell either like spearmint or caraway. Previous machines would not have been able to distinguish between the two.
The development will allow the creation of a new generation of biosensors with an acute ability to sniff out problems. These could have many industrial uses such as telling when food has gone off, and they could even be accurate enough to smell how much pollution is in the atmosphere.
A collaboration of academics from The University of Manchester and the University of Bari in Italy, have created a biosensor that utilises an odorant binding protein. The team’s findings are published today in the journal Nature Communications.
New Sensors Could Allow Machines to Smell More Accurately Than Humans - [Link]
praveen @ circuitstoday.com:
This article is about interfacing pressure sensor to arduino. The pressure sensor used here is SPD005G from Smartec . SPD (Smart Pressure Device) is a series of silicon based pressure sensors suitable for industrial as well as house hold applications. These sensors are generally available in plastic inline or dual inline packaging. SPD sensors are generally available in two operation modes namely gauge type and absolute type. In gauge type the pressure is measured with respect to the atmospheric pressure. There is a small vent on the package for getting contact with the atmosphere. In absolute type, the pressure is measured with respect to vacuum. A small vacuum chamber is incorporated into the package during fabrication. Typical applications of SPD005G are medical systems, BP monitoring, air conditioning systems, process control, hand held pressure sensors etc.
Interfacing pressure sensor to arduino - [Link]