Choosing the right Electronics Shop

In the last couple of months I could collect some experience in where to buy the electronic components I use in my projects. Since in most cases I don’t care so much about several weeks of delivery time I usually order from one of several Chinese online shops or trading platforms. The following list reflects my own experience with these shops and platforms and does not have to necessarily reflect other opini.....

WeatherStation Kit ready for your order

Great news! My supplier in China has finally sourced all the components that come with the WeatherStation Kit and I’m ready to take your orders. For a limited time it will cost only USD $19.95 and free shipping is included for more than 70 countries. The kit is a good entry to get started with the ESP8266 since it requires only minimal wiring from you. Extend the source code fo.....

ESP8266: Wifi data logger already running for more than 2 months on batteries!

More than 1440 hours or in other words 60 days ago I put 3 AA batteries from IKEA in the battery box of the ESP8266 test board and started a program that would send temperature and humidity every 10 minutes to Thingspeak through its Wifi interface. I removed all unnecessary power consumers from the board such as LEDs and light resistor but there would have been more potential to improve longevity of the batteries. By setting a fixed IP .....

ESP8266: Calibrating the Wifi Scale With Temperature Compensation

In my last post I talked about my self made scale. There are plenty of applications for a sensor that can sense the weight of things. But I guess the scale should not be tared (or set to zero) every time the ESP8266 wakes up from sleep. The load cell is basically a resistor that reacts to tearing and pushing of the metal bar. But like all resistors, they are prone to temperature drift. Thi.....