ESP8266 based WiFi camera

WiFi camera can be handy in many areas where you don’t want tracing wires. They are not expensive if you are looking for complete solution. If your application isn’t critical then why not building one by yourself. Johan simply took two well known modules – arducam and ESP8266 module. He built a baseboard to fit hem both including power supply solution and couple other features like optional SPI flash, FTDI connector.


He called his development esparducam – the combined name of both modules. He wrote a demo application where it is possible to get images by using HTTP GET method. If you would like to give it a try, follow his project Github page.


Alexander Sadovsky on Yandex policies and future tendencies

Head of Yandex search services Alexander Sadovsky recently gave a lecture that was both interesting and genuinely informative. However, although the lecture was brilliant as always, the questions and answers that took place afterwards allowed us to shed some light on Yandex trends and modern tendencies.


Question: What are you planning to switch off after the backlinks? What will it be?

Alexander Sadovsky: We are always trying to switch everything on and not turn it off. We are not eager to get rid of things. We want to give new opportunities and possibilities.

Question: Does a career in online marketing have any limitations? Continue reading


Internet connected power usage monitor

Our homes are filling with energy hungry devices. Some of them are constantly active like fridge, routers, lighting, some switched off or on stand-by. Each of them takes some portion of energy that reflects on the end month bill. Some things you can control, but some not. So in order to hunt inefficient nodes you need some sort of energy usage monitoring.

You can find lots of implementations where some are simple indicators, other are advanced and web enabled.


TSalwach @ have built his own version of energy monitoring system which looks really promising. His implementation monitors all three phases where he extracts several parameters:

RMS Voltages and currents on each phase

Apparent power (product of RMS voltage and RMS current)

Real (active) power

Reactive power with inductance/capacitance indication (time delay method *)

Power factor

Frequency (zero crossing detection with linear interpolation)


Tariff indication

Costs of energy and alternative cost (on single tariff)

He used two microcontroller boards to for this task. First one is Raspberry Pi which takes care of web accessibility, data storage and interpretation. The other is Nucleo board with STM32F072RB ARM microcontroller. This is a front end which collects data from AC sensing transformers.


Arduino based GPS data logger to SD card

You can use GPS data for many interesting projects and experiments. By analyzing logged data you can track the movement of the object, analyze you hiking route, RC plane model, weather baloon and other crazy stuff. Building such logger isn’t very complex task as it involves only standard modules and practically no soldering needs to be done.


Almost all standard GPS modules support so called NMEA0183 data format – a short message which contains all data including position and time stamps. Once connected, GPS module automatically sends this data via serial interface. Arduino simply needs to capture it and store data to memory like SD card. In this project, data is stored in FAT32 (or FAT16) formatted SD card. Arduino accesses SD card through SD card V4.0 shield. This is simple a barebones for developing project further to fit your specific needs.