This product is in particular suitable in case a supply voltage is required which is somewhere in between the voltage level of a fully charged and fully discharged battery. At a certain moment the DC/DC Converter needs to switch over from Buck to Boost mode automatically. The RP604 is designed for IoT applications which are mainly in a sleep mode and wake-up periodically to perform a measurement, transmit some data and resume to sleep mode again. For such kind of applications, the current consumption in sleep mode should be kept as low as possible. The RP604 consumes only 0.3 µA and has a peak efficiency of 90% at 0.1 mA output current.
Small, versatile, fun, and inexpensive! Use the 254 word library to bring speech to your Arduino projects! Speak, Arduino, Speak!
About a year ago, I designed an Arduino shield that allowed for you to add voice to your electronic designs. I’ve since been able to minimise that design into a much less inexpensive, and smaller unit. This unit has a 254 word library that consists of colours, commands, months/days/time, numbers, directions, feelings, units of measurement, security words, math lingo, and general words; all of which are spoken by “Lucy” – A lovely female voice with an English accent! Meet “The Little Buddy Talker” Arduino compatible speech kit set! It is Production Ready, and eager to land in your hands!
The project is live on kickstarter and has 29 days to go.
Now you can use your smartphone to check how clean the air is, measure the freshness of food or even the level of your blood sugar. This has never been so easy. All credit goes to the new spectrometer sensor which is developed at the Eindhoven University of Technology and can be easily attached to a mobile phone. The little sensor is just as precise as the normal tabletop models used in scientific labs. The researchers published their invention on 20th December in the popular journal Nature Communications.
Spectrometry is the analysis of the light spectrum. It has an enormous range of applications. Every organic and inorganic substance has its own unique ‘footprint‘ in terms of light absorption and reflection. Thus it can be recognized by spectrometry. But precise spectrometers are bulky and costly since they split up the light into different colors (frequencies), which are then measured separately.
The intelligent sensor developed by Eindhoven researchers is able to make such accurate measurements in an entirely different way. It uses a special photonic crystal cavity that acts as a ‘trap’ of just a few micrometers into which the light falls and cannot escape. This trap is situated in a membrane. In the membrane, the captured light generates a tiny electrical current which can be measured accurately. The accurate working cavity design is made by Žarko Zobenica, a doctoral candidate.
The sensor can measure only a narrow range of light frequencies. To increase the frequency range, the researchers placed two of these membranes above each other closely. The two membranes affect each other. Changing the separation gap between them by a tiny amount also changes the light frequency that the sensor recognizes. To understand this the researchers, supervised by professor Andrea Fiore and associate professor Rob van der Heijden, included a MEMS or micro-electromechanical system.
This mechanism can change the measured frequency by changing the separation between the membranes. In this way, the sensor is able to cover a range of about thirty nanometers. Within which the spectrometer can recognize some hundred thousand frequencies with an exceptional precision. The research team demonstrated several applications like an extremely precise motion sensor and a gas sensor. All made possible by the clever use of the tiny membranes.
As per Professor Fiore‘s expectations, it will take another five years or more before the new spectrometer actually gets into a Smartphone. The main difficulty at this moment is the frequency range covered is still too small. It covers only a few percent of the most common spectrum, the near-infrared.
Given the huge potential and the wide field of applications, micro-spectrometers can become just as important as the camera in the smartphones of future.
XMOS is one of the many companies that has ventured in voice recognition technology. They created the VocalFusion XVF3500 device, the first voice processor to have true stereo-AEC support in a far-field linear microphone array solution. Voice recognition is a relatively new technology for consumers which we came to know with Siri, google home, Alexa etc. However, this technology has been developed since 1950s with a very limited understanding of numbers. Nowadays, voice recognition software can answer all kind of questions, perform activities (such as calls, notes and web searches), and even answer to sarcastic questions. Experts predict that 50 % of all web searches will be made using voice by 2020.
Voice recognition is not only about not using keyboards, but also about security and usability. Thanks to software such as Siri people can now make phone calls in the car without even looking at their phone, play music and send messages. The biggest problem is accuracy specially when dealing with accents which the voice software may not be able to comprehend.
Speech recognition works by analyzing the sound, filtering what you say and digitalizing it into a form that the computer can read, and then analyzing it for meaning. It has become increasingly complex to program this kind of software because of language, dialects, accents, and phrasing. Also, background noise can easily throw off the interpretation of your speech.
At CES 2018, XMOS plans to display their new XVF3500 voice processor alongside the VocalFusion 4-Mic Dev Kit, which was the first far-field linear array solution to achieve Amazon AVS (Alexa voice service) qualification, delivering easy integration of Amazon Alexa into commercial and industrial electronics. The kit is based on the VocalFusion XVF3000 device which provides acoustic echo cancellation and advanced noise suppression. This will allow developers to build Alexa enabled products which will accelerate it’s deployment in new systems and new devices giving customers the ability to access Alexa from more places.
The development kit includes the XVF3000 voice processor, I2S serial audio and I2C serial control interfaces, cables, xTAG debug adapter and much more. It enables across the room voice interface solutions which are then processed by cloud based recognition software even in places with complex acoustics and noisy environments. This could help solve the background noise issues allowing a more accurate interpretation and an improved user experience.
smdprutser.nl build a soldering iron controller based on PIC16F1823:
In series thermocouple soldering iron have a thermocouple in series with their heating element and thus only have two connections (actually one more which is electrically connected to the tip for ESD purposes). When a voltage is applied to the two terminals the tip heats, when unpowered the thermocouple voltage can be read.
70W soldering iron controller – [Link]
This is a 60 V 3A step down DC-DC converter. Sample applications are: 12 V, 24 V and 48 V Industrial, Automotive and Communications Power Systems. The TPS54360 is a 60 V, 3 A, step down regulator with an integrated high side MOSFET. The device survives load dump pulses up to 65V per ISO 7637. Current mode control provides simple external compensation and flexible component selection. A low ripple pulse skip mode reduces the no load supply current to 146 μA. Shutdown supply current is reduced to 2 μA when the enable pin is pulled low. Under voltage lockout is internally set at 4.3 V but can be increased using the enable pin. The output voltage start up ramp is internally controlled to provide a controlled start up and eliminate overshoot. A wide switching frequency range allows either efficiency or external component size to be optimized. Frequency fold back and thermal shutdown protects internal and external components during an overload condition.
60V input 5V @3A output DC-DC Converter for Industrial and Automotive – [Link]
Smartphones in recent times have contributed to the growth of the medical sensing industries with a major success in the usage of a smartphone camera and flash to detect heart rate. Specialized Apps installed on the phone can use the phone inbuilt camera and flash to read an individual heart rate with high accuracy but nothing else in the space of health monitoring. Sensio is a biosensor that will allow smartphones to track six different health metrics, a big game changer in the smartphone and medical industry.
The Taiwan-based mobile chipset maker MediaTek has recently introduced MediaTek Sensio, the Industry’s first 6-in-1 biosensor that will turn smartphones into a personal health companion. Sensio will come as an embedded module for smartphones which make it possible to easily check and monitor one’s physical wellness.
The MediaTek Sensio MT6381 will allow smartphones to track a user’s heart rate, blood-pressure, heart-rate variability, peripheral capillary oxygen saturation, ECG (Electrocardiography) and photoplethysmography (PPG). It works using an integration of hardware and software in order to measure all these health data in about 60 seconds, as claimed by MediaTek. The company will have an app that can track all of this data and have it accessible to the user and also stored in the cloud.
The MediaTek Sensio module uses a combination of LEDs (light emitting diodes) and a light-sensitive sensor to measure the variations in red and infrared light from the user’s fingertips. The module is able to measure the ECG and PPG levels by creating a closed loop between the user’s heart and the biosensor which is made possible when the user touches the electrical sensors and electrodes on the device.
The following are the features of the MediaTek Sensio:
- Heart Rate – Measures heart beats per minute.
- Heart Rate Variability – Measures variation in the time between heartbeats.
- Blood Pressure Trends – Measures blood pressure trends to help users see data over a period of time.
- Peripheral Oxygen Saturation (SpO2) – Measures the amount of oxygen in the blood.
- Electrocardiography (ECG) – Measures the electrical activity of the heart over a period of time and displays it in graph form.
- Photoplethysmography (PPG) – Measures the change in volume of blood.
The MediaTek Sensio module includes the following:
- Integrated R and IR LEDs for reflective PPG measurement + 1 -channel ECG analog front -end.
- Compact 6.8 mm x 4.93 mm x 1.2 mm OLGA 22-pin package.
- Total External BOM: 4caps + 2 electrodes
- I2C / SPI digital interface.
“Giving people the power to access their health information with a smartphone is a major step in making the world a healthier place,” said Dr Yenchi Lee, Sr. Director of Product Marketing for MediaTek’s wireless business. The MediaTek Sensio is expected to be available beginning in early 2018.
A team of researchers from Tsinghua University in cooperation with People’s Liberation Army Air Force General Hospital, China, has produced a two-stage patch to test the blood glucose levels. They published their research paper on the open access site Science Advances. In the paper, the group describes their patch system and how it succeeds in a small sample test with volunteer human patients.
In this new effort, the researchers of Tsinghua University sought to make life a little easier for people living with diabetes by developing an easier way to test their glucose levels. Now they can easily monitor their own blood glucose level and maintain their diet accordingly.
For most diabetics, the conventional method was to check their glucose levels by using a small device that pricks the skin just enough to draw a very tiny amount of blood, usually from a fingertip. A drop of blood is then squeezed onto a test strip inserted into a glucose monitoring device, which then shows a reading. This painful and prone to infection process often causes many diabetics to stop testing their blood glucose level, hence putting themselves at higher risk.
In this new procedure, the researchers introduced a two-stage, non-invasive method to accomplish the same result. The first stage consists of placing a small amount of Hyaluronic acid, a component frequently found in skincare products, on the skin and then pressing a paper battery on the same area. The battery pushes the acid to make its way into the skin. Then the acid induces a change in osmotic pressure in the subcutaneous fluid. That forces glucose back upwards toward the outer surface of the skin. After 20 minutes, the battery is removed and the second stage takes place. A 3μm thick, five-layer biosensor is attached to the same place of the skin. It looks like a Band-Aid with a square of gold foil on its center. The biosensor can be read by standard lab equipment.
A clinical trial of their device on a woman with diabetes and two other non-diabetic patients at the hospital showed that results were nearly as good as standard lab equipment without causing any discomfort to the volunteers. In the following video, the researchers explain how it works:
Simple, tiny USB to UART converter with digital isolator working between 2.5V and 5V up to 3Mbaud, with the Arduino Pro mini connector.
It’s a USB to UART converter with a digital isolator at the UART side. It has a micro USB for connecting to the PC and a 6 pin header with the same pin-out of the Arduino Pro mini board.
The chip FT231XQ is used as interface between the USB and the UART protocol, while the Si8642 is used for isolate the board from the PC. This converter is very useful if you are working on some projects and worrying about short circuit with the main power supply. Because the isolator isolates the two sides therefore there is no electrically connection.
- Original FT231XQ: Compatible with almost all the operating systems and capable of variety baud rates from 300 baud up to 3 Mbaud
- Original Si8642BB-B-IS1: Low-Power Quad-Channel Digital Isolators with isolation rating up to 2.5kV
- Size of 40 x 17 mm
- 4.1 mm isolation between the two sides guarantee an electrical isolation up to 1kV
- Working between 2.5V to 5V.
- TX and RX LEDs indicators.
- Micro USB connector.
- Standard 2.54mm 6 pins female header.
- Protected by a transparent heat shrink sleeve.
The board is live on kickstarter available for funding and has 24 days to go.
Hi guys, for today’s tutorial, we will be building an Arduino on a breadboard. The Arduino on breadboard is basically a bare bones arduino, featuring only the micro-controller as the major component, without all the other parts that makes up the Arduino, like the usb port, the on-board serial to usb converter, voltage regulators, etc, most of which are sometimes not needed in a project after programming has been done.
Arduino (Atmega328p) on a Breadboard – [Link]