WISP – Wireless Identification and Sensing Platform

WISP4

WISP, the Wireless Identification and Sensing Platform, is a family of sensors that are powered and read by UHF RFID readers.

WISP, the Wireless Identification and Sensing Platform, is a family of sensors that are powered and read by UHF RFID readers. WISPs do not require batteries since they harvest their power from the RF signal generated by the reader. The WISP is an open source, open architecture EPC Class 1 Generation 2 RFID tag that includes a fully programmable 16 bit microcontroller, as well as arbitrary sensors.

WISP – Wireless Identification and Sensing Platform – [Link]

Hacking home weather station transmitter

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Bob hacked a home weather station transmitter and made a home thermometer from it. He writes:

Recently I’ve found this piece of electronic on the dumpster, it was looking interesting – compact case with battery holder, LCD display, temperature and humidity sensor. It has also radio transmitter, but I’m not interested in it since I don’t have the receiver station. I decided to bring it back to life.

Hacking home weather station transmitter – [Link]

3W Stereo Audio Amplifier using TDA7266D

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Tiny stereo audio amplifier board has been designed around SMD TDA7266D IC from ST. The TDA7266D is a dual bridge amplifier specially designed for Portable Audio, LCD TV/Monitor, PC Motherboard, and TV applications. This circuit provides high quality audio output of 3W approx. on each channel with standard audio signal input. The circuit works with 3.5V to 5V. Due to low supply input this amplifier is suitable for small size audio gadgets and portable audio applications like MP3 player, Voice messaging system, Warning signals, Annunciator etc.

Specifications

  • Supply voltage range 3.5 to 5v (maximum supply 5v due to small pcb and small thermal area)
  • Output power 3+3w @thd = 10%, rl = 8ω, vcc = 3.7v (3w approx.)
  • Single supply
  • Minimum external components no svr capacitor no bootstrap no boucherot cells internally fixed gain
  • Mute functions (jumper close)
  • Short circuit protection
  • Thermal overload protection

3W Stereo Audio Amplifier using TDA7266D – [Link]

RELATED POSTS

Raspberry Pi Web Server using Flask to Control GPIOs

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In this article “Rui Santos” shows us how to configure Raspberry Pi as server and use it to toggle two LEDs over the internet.

In this project you’ll create a standalone web server with a Raspberry Pi that can toggle two LEDs. You can replace those LEDs with any output (like a relay or a transistor). In order to create the web server you will be using a Python microframework called Flask.

Raspberry Pi Web Server using Flask to Control GPIOs – [Link]

Hot rods keep the die cool

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Clemens Valens @ elektormagazine.com shows us a new IC Package that keeps the IC cool.

Texas Instruments’ HotRod QFN is a thermally enhanced plastic package with solder lands on all sides as well as power buses for enhanced current carrying capability. Inside the package the die is mounted on a copper lead frame which eliminates the power wire bonds, improving electrical and thermal performance. This technique also improves application efficiency and minimizes package parasitic radiation.

Hot rods keep the die cool – [Link]

0.8A step-up DC/DC converters in a tiny package

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Torex Semiconductor’s XC9141/XC9142 series of 0.8A step-up DC/DC converters come with an input–output disconnection function (load disconnection function) to prevent malfunctioning during standby, and for device functionality that enables power supply to RTC.

When the output voltage is 3.3V, the IC can start from an input voltage of 0.9V with a resistance load of 100Ω, enabling use in devices driven by one alkaline or nickel-hydrogen battery. The input voltage range is 0.65V to 6.0V, and the output voltage range can be set from 1.8V to 5.5V (accuracy ±2.0%) in steps of 0.1V. A switching frequency of 1.2MHz or 3.0MHz can be selected to match the application.

0.8A step-up DC/DC converters in a tiny package – [Link]

App note: Transformers

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All about transformers and its different uses in this application note from Murata.

App note: Transformers – [Link]

LTC7813 – IC cascades boost/buck controllers

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Linear Technology Corporation introduces the LTC7813, a dual output (boost + buck), low quiescent current synchronous DC/DC controller. When cascaded, its independent step-up (boost) and step-down (buck) controllers regulate the output voltage from an input voltage that can be above, below, or equal to the output voltage, including during an automotive load dump or cold crank. Unlike conventional single inductor buck-boost regulators, the LTC7813’s cascaded boost + buck solution provides fast transient response with continuous, non-pulsating input and output currents. It substantially reduces ripple voltage and EMI, ideal for automotive, industrial and high power battery operated systems.

LTC7813 – IC cascades boost/buck controllers – [Link]

Door Status Monitor using the ESP8266

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Rui Santos tipped us with this tutorial on how to monitor the status of your door using an ESP8266.

In this project you’re going to monitor the status of a door using an ESP8266. The goal of this project is to show the endless possibilities that this $4 WiFi module offers when integrates with a free platform that I’m about to show you.

Door Status Monitor using the ESP8266 – [Link]

Display YouTube Stats on LCD Screen

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In this guide “padeath” shows us how to use a 320×240 LCD display with Arduino UNO to display youtube statistics. The stats are updated once in a minute using the google API.

This little Instructable will show you how to use a 320×240 pixel LCD screen connected to an Arduino Uno with a network shield too, to show stats for Youtube channels.

I created this as I wanted to see how many subscribers and views I had on my channels without having to check Youtube 🙂 The stats update on the LCD screen every minute using the google api.

Display YouTube Stats on LCD Screen – [Link]