Teardown: Amazon Dash Button keeps you connected


Brian Dipert @ edn.com has done a teardown on Amazon’s dash button and shows the parts inside.

How much hardware was Amazon able to squeeze into such a diminutive bill-of-materials budget, or perhaps more accurately, how much are Amazon and its consumable-supplier partners subsidizing the initial hardware cost in the hope of plenty of future generated profits? Let’s find out.

Teardown: Amazon Dash Button keeps you connected – [Link]

Sensirion Tiny sensor hones temperature accuracy


Housed in a tiny 8-pin DFN package, the STS31 digital temperature sensor from Sensirion guarantees accuracy to within ±0.3°C over a temperature range of -40°C to +90°C. A low-cost version, the STS30 achieves the same accuracy over a temperature range of 0°C to +65°C. Both devices are only 0.9 mm high and occupy a footprint of 2.5 × 2.5 mm.

Sensirion Tiny sensor hones temperature accuracy – [Link]

Hardware serial port monitor over WiFi


This tutorial shows how to connect Arduino to the TX line (of a router, RPI) and display serial data on smartphone over WiFi.

Arduino listens for serial port communication on its hardware serial port. Then it sends every received line of data trough software serial port to ESP8266. ESP8266 puts every received line of data into circular buffer. ESP8266 also runs code for webserver and a website which pools the buffer for new data and displays it on the website. (Sadly there is no websockets support for ESP8266.) To see this serial data all you have to do is open the website (IP) on your smartphone and enable javascript.

Hardware serial port monitor over WiFi – [Link]

DIY Wearable Posture Sensor


With the help of this wearable device you can improve your posture as it will remind you whenever you slouch. The device is based on ADXL335 accelerometer and Attiny85 microcontroller and a vibration motor will get you notified.

Posture sensors/monitors have been a recurring theme on this blog. They are supposed to remind you of your posture and prevent you from slouching, which can be a cause for back pain and headaches.While my previous sensors were either fixed to a chair or desk, this time I wanted to create a wearable version, that would allow for free movement. As always, one of the main goals was to make this project cheap and easy to reproduce.

DIY Wearable Posture Sensor – [Link]

Wifi Home Thermostat


asheville makers @ instructables.com has posted a Wifi enabled thermostat that can be programmed via a touch screen display or via the internet.

This Instructable explains about how I built WiFi enabled thermostats for my home. The thermostats are programmable with 6 different time periods during the day, although increasing that to any arbitrary number would be fairly trivial.

Wifi Home Thermostat – [Link]

4A Bipolar Stepper Motor Driver Based on LV8727E


The Project is based on LV8727E IC from ON Semiconductor. The LV8727 is a PWM current-controlled micro step bipolar stepping motor driver. This driver can provide eight ways of micro step resolution of 1/2, 1/8, 1/16, 1/32, 1/64, 1/128, 1/10, 1/20, and can drive simply by the step input. This Bipolar Driver works with supply input 9V to 36V (Replace L317 with L317HVT for supply input up to 45V DC). Load current up to 4Amps.


  • Supply 9V to 36V DC (Replace L317 with L317HVT for Supply up to 45VDC)
  • Load Current Up to 4Amps
  • Inputs: Step Pulse, Direction, Enable
  • Micro-Stepping: 4 Way DIP Slide Switch
  • On Board Power Indication
  • On Board L317 for 5V DC Regulator
  • Current Adjust Preset

4A Bipolar Stepper Motor Driver Based on LV8727E – [Link]

PWM dimmer for RGB LED


Lukas Fassler has designed and built a PWM dimmer for RGB LED:

In my last post I’ve described the design and construction of my LED dimmer project. This project here is similar but a bit more involved. It controls RGB LEDs so it can not only change the brightness but also the color of the light. Instead of a simple pot it used a pair of rotary encoders with push buttons. One controls the brightness, pushing its button turns the light on or off. The other changes the color, pushing its button toggles between color and white.

PWM dimmer for RGB LED – [Link]


Arduino DS18B20 Thermometer on iOS or Android


maroelawerner @ instructables.com has a tutorial on how to display temperature data on an Android or iOS device using Arduino and Blynk app.

In this Instructable I am going to attempt to show you how to put together a little project to use the Blynk app (optainable at http://www.blynk.cc/) to display the temperature remotely on a iOS or Android device.

I came across an posting on my Google+ where somebody required some help with this. It looked interesting, so I decided to have a try myself.

Arduino DS18B20 Thermometer on iOS or Android – [Link]

How to Implement Embedded Ethernet


Maurizio @ dev.emcelettronica.com has tipped us with his latest article on how to implement embedded Ethernet on any mcu. The article shows the basic principle of Ethernet implementation.

Usually We need embedded systems inside devices, particularly the so-called intelligent devices, to communicate with a command/control/administrative center. Typical such situations could be a remote security camera that can send you video clips when queried, an embedded system that can send status when checked through a web browser or a vending machine that is capable of sending an email when service is required.

How to Implement Embedded Ethernet – [Link]

Geiger–Müller counter that works with Arduino


Bob @ robertgawron.blogspot.com has posted a Geiger-Muller project that can be used with Arduino or any other microcontroller board.

The Geiger–Müller counter is a relatively simple tool to measure ionizing radiation. To increase sensitivity, construction presented here contains three (instead of one as usually) soviet STS-5 lamps. This is important for measurements of natural sources of (low) radiation like soil, rocks (an article about my trip with Geiger–Müller counter on Śnieżka mountain).

Geiger–Müller counter that works with Arduino – [Link]