Measure the CO2 with CozIR-LP sensor and ESP32
Nowadays we can develop a device which will measure all parameters of air - temperature, humidity and also we can buy CO2 sensor and measure the quality of air. The value of CO2 sensor is really important for us, because the increased concentration of CO2 can cause fatigue, drowsiness and higher concentration can endanger your health. I used CozIR-LP sensor and the data is sending to tmep.eu where is the vizualition of data.

How to decrease the deep-sleep current of ESP32-CAM
ESP32-CAM is very popular development board which contains Wi-Fi and Bluetooth connectivity with ESP32 module, OV2640 camera, slot for microSD card and programmer - USB-UART convertor. These parts are designed on 27x40 mm board. I wanted to power the board by batteries, so my goal was to decrease the current in the deep-sleep mode and also in the runnning mode. The deep-sleep current was more than 5mA with the default hardware.

Weather station with ePaper and weather data from OpenWeatherMap
The weather station is the first DIY project which makers do after sometime of playing with electronics. It is project which is helpful and makers using this long time. This article introduce my weather station which is based on board with ESP8266, the display is ePaper and the data for current weather and forecast are receiving from OpenWeatherMap which provides also API for free.

Update AT firmware to ESP8266 (ESP12E) in Linux
During the development of SW support of BigClown Wi-Fi module with ESP8266 in ESP12E module. Martin Grames found issue with using of SNTP or SSL, you have to update AT firmware. Martin updated AT firmware for ESP12F and then wrote an example code cryptoclock. I tried update my Wi-Fi module with ESP12E and then I found a problem. This tutorial should help you to update AT firmware in operating system based on Linux (in my case Linux Mint).

Meteo v3 - verstatile board with ESP12E/ESP07/ESP08
Originaly, this board - Meteo v2, was designed like replacement of general analog thermometer which costs ~1 USD. But, thanks to comments of makers, the board was redesigned to versatile board which you can use for everthing you need. Meteo v3 is the latest version of board and you can easily connect I2C devices (sensors, ADC, DAC, LCD), 1-wire sensors and control output devices with 2 GPIOs which are connected to female header.

About ESP32 and FireBeetle development board - I2S and Bluetooth
In previous article we introduced the ESP32 microcontroller and its peripherals. Now, we will focus on the practical use of one of its peripherals - Bluetooth.

Barometer WiFi ePaper 2.9
Josef Zvol?nek (facebook, google plus, twitter) shared this amazing project of his weather station with tri-color ePaper display. Josef shared complete project with ino file for ESP8266 and also gerber files for PCB. Thanks a lot for sharing.

About ESP32 and the FireBeetle development board.
The first article about ESP32 and development board DFRobot by Richard Stefun. What is ESP32, module with ESP32, development board with ESP32 and how to install FireBeetle library to Arduino IDE.

Bolt IoT - first example and settings
The picture tutorial how to set and run Bolt IoT platform. Info about Bolt IoT and kickstarter campaign was mentioned in this news. The base component is ESP8266 chip in ESP12S module. Other components are GREEN LED (cloud indication) and BLUE LED (WiFi indication, voltage regulator for 3.3V (LMS1117) and microUSB cabel which is used like power supply. The main point of this project is SW part of Bolt IoT. Firmware of ESP8266 and cloud of the platform.

The board for weather station (meteostation) with ESP12E module (ESP8266, NodeMCU)
After my experiences with ESP12E (NodeMCU, ESP8266) and SHT75 temperature/humidity sensor I decided to make second version of board used for weather station. The first version is available on https://time4ee.com/articles.php?article_id=33.

Watering system with NodeMCU (ESP8266, ESP12E)
If you follow me on social networks (facebook, twitter and google plus) maybe you saw a few posts which I shared. My the latest project is watering system with popular WiFi chip called ESP8266, ESP12E module, NodeMCU development board. This project was made like watering system for a few plants during summer vacations.

ESP32, SunDuino - temperature/humidity Si7021 sensor and OLED 128x64px (I2C)
Other article about ESP32. We again connect ESP32 to temperature/humidity sensor Si7021 (HTU21), but today we also connect OLED where will be showed data from sensor. The OLED has 128x64px resolution and communication bus is I2C as well as Si7021.

ESP32, SunDuino and temperature/humidity sensor Si7021 (HTU21)
Other article about ESP32, with using of development board of SunDuino ESP32 and temperature/humidity sensor Si7021 (HTU21). I recommend the first article about ESP32 and SunDuino ESP32 which is available on https://time4ee.com/articles.php?article_id=43 Thank dfrobot.com for ESP32. I thank designer of SunDuino ESP32 board...

ESP32 and Arduino IDE
Finally, I can write you a short tutorial how to play with ESP32 (more powerful than ESP8266). On the internet is a lot of tutorials how to do it, but this is a little bit different. I don't have LoLin32, Hornbill or ESP-DevkitC.

ESP12E (NodeMCU, ESP8266) + Si7021
After my experimentes with NodeMCU and SHT75 I designed next version of my mini meteostation. I designed own PCB for plastic box. I chose the same ESP8266 module which is in NodeMCU, ESP12E. SHT75 temperature/humidity sensor is expensive (but very accurate), so I chose another temperature/humidity sensor. Si7021 by Silicon Labs company.