Plastic fingerprint sensor also detects underlining veins

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FlexEnable, the leader in the development and industrialisation of flexible organic electronics, and ISORG, the pioneer in organic photodetectors and large area image sensors in printed electronics, have revealed the world’s first large area flexible fingerprint sensor on plastic designed for biometric applications. With an 8.6 cm x 8.6 cm active area, 84µm pitch (78µm pixel size with 6µm spacing) and 1024 x 1024 = 1048576 pixel resolution, this revolutionary flexible sensor is only 0.3 mm thick and can operate in visible and near infra-red up to wavelengths of 900 nm. The technology is capable of measuring not only the fingerprint, but also the configuration of veins in the fingers, providing additional security versus that of a surface fingerprint alone.

Plastic fingerprint sensor also detects underlining veins – [Link]

ESP8266 mains energy monitor

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Brian Dorey has designed a mains energy monitor based on ESP8266 that have sensors for the mains current, electric meter and gas meter.

As the new solar logger did not have this functionality we decided to design a new data-logger that would measure not only the mains current usage but also keep track of the electric meter and gas meter so we can easily see how much energy we are using in the house.
The new mains energy monitor was designed to be a standalone box that would be powered from the mains and have sensors for the mains current, electric meter and gas meter. As we didn’t want to run any more wires around the house we also decided to make it wireless connecting to our network over Wi-Fi.

ESP8266 mains energy monitor – [Link]

Power ON Delay Switch

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Power-ON Delay Switch which can be used in all applications requiring a delay during power-on from 1 to 60 seconds.

Specifications

  • Supply input 5 VDC
  • Relay output SPDT relay
  • Relay specification 5 A @ 250 VAC
  • Preset adjustable range function
  • Power-On LED indicator
  • Screw terminal connector for easy relay output connection
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 44 mm x 42 mm

Power ON Delay Switch – [Link]

ChameleonMini – A Versatile NFC Card Emulator

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ChameleonMini is a programmable tool for NFC Cards analysis and emulation. It helps you to emulate and clone contactless cards, read RFID tags and sniff RF data.

The credit-card shaped ChameleonMini is a versatile tool for practical NFC and RFID security analysis, compliance and penetration tests, and various end-user applications. The freely programmable platform can create perfect clones of various existing commercial smartcards, including cryptographic functions and the Unique Identifier (UID).

ChameleonMini – A Versatile NFC Card Emulator – [Link]

Visuino – visual programming environment for Arduino

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Visuino is the latest software developed by Mitov Software which allows you to program your Arduino boards using a graphical interface. So far only the official boards are supported but more will come. Using Visuino you can easily create complex programs using drag and drop interface without the need to become expert in programming. Check it out on the link below.

Visuino – visual programming environment for Arduino – [Link]

MIDI to USB Adapter with Teensy

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Joonas Pihlajamaa wanted to connect his keyboard to his Macbook and for that reason he build a MIDI to USB interface using Teensy board, an optocoupler and some resistors.

Thankfully, I had a MIDI connector and a high-speed optocoupler at hand, and with these I could implement a MIDI in rather easily. After some investigation with Arduino Uno, it seemed quite simple to receive the serial MIDI bytes and dump them over Arduino serial

MIDI to USB Adapter with Teensy – [Link]

OSHChip – general purpose processor board in DIP format

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OSHChip is a general purpose processor board based on ARM Cortex-M0 32 bit processor running at 16 MHz. It includes 2.4 GHz Bluetooth Low Energy radio and a broad range of built-in Peripherals. It features 256 KBytes of Flash memory for program and data and 32 KBytes of SRAM. All this functionality comes in a tiny DIP like package which is compatible with a breadboard thus making prototyping an easy task. OSHChip is an open source project and all design files are available on github: https://github.com/OSHChip/OSHChip_V1.0_Docs

OSHChip – general purpose processor board in DIP format – [Link]

VL53L0 – Ultra-fast distance sensor

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by Harry Baggen @ elektormagazine.com

STMicroelectronics has launched their second-generation distance senor VL53L0, which is based on STM’s popular FlightSense technology. This sensor is suitable for use in smartphones and tablets to make quick distance measurements for an integrated camera, but it can also be used in robots, drones and wearables.

Despite its compact dimension of 4.4 x 2.2 x 1 mm, the VL53L0 integrates a vertical cavity surface-emitting laser (VCSEL) operating at a wavelength of 940 nm, a single-photon avalanche diode (SPAD) light detector, and a microcontroller that controls the entire measurement process and calculates the measured distance. Using a 940 nm laser in combination with integrated infrared filters makes the detector insensitive to ambient light, and the laser light is not visible to the human eye.

VL53L0 – Ultra-fast distance sensor – [Link]

10 steps to selecting a microcontroller

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Jacob Beningo @ edn.com discuss on how to select the right mcu for your next project based on hardware and software architecture.

Selecting the right microcontroller for a product can be a daunting task. Not only are there a number of technical features to consider, there are also business case issues such as cost and lead-times that can cripple a project. At the start of a project there is a great temptation to jump in and start selecting a microcontroller before the details of the system has been hashed out. This is of course a bad idea.

10 steps to selecting a microcontroller – [Link]

Unipolar Stepper Motor Driver Circuit

This unipolar stepper motor driver circuit is used to drive a 12V unipolar stepper motor with a current rating of 1.25A. It uses PCA9537 IC, which is a 10-pin CMOS device that provides 4 bits of General Purpose I/O (GPIO) expansion with interrupt and reset for I2C-bus/SMBus applications. It consists of a 4-bit configuration register (input or output selection), 4-bit input port register, 4-bit output port register and a 4-bit polarity inversion register (active HIGH or active LOW operation). In addition, the device uses PCA9665 IC that serves as an interface between most standard parallel-bus microcontrollers/microprocessors and the serial I2C-bus allowing the parallel bus system to communicate bidirectionally with the I2C-bus.

The PCA9537 totem pole GPIO used in this circuit has a fixed I2C-bus slave address, 92H. The host controller’s firmware generates the I2C byte sequences needed to toggle the outputs and provide the waveforms at the gate inputs G1 to G4. The type of waveform will be one corresponding to wave, two-phase or half-step drive that is chosen by the user. The duration of the pulses is controlled by time delay implemented in the host controller firmware. It is shown as a reference for the various waveforms. The maximum I2C-bus speed supported by PCA9537 is 400kHz.

Motor drivers have various applications that are used when accurate positioning is required. Such applications are for use in holding or positioning, like packaging machinery, and positioning of valve pilot stages for fluid control systems. The device enhances the performance of machines and other simple devices that may significantly support industries, and other commercial entities to make the work easier.

Unipolar Stepper Motor Driver Circuit – [Link]