Embedded Lab | Embedded Systems tutorials, projects, and more …

Tutorial 8: ESP8266 Internet clock

Posted on February 8, 2017 by R-B 4 comments

The National Institute of Standards and Technology (NIST) provides official time in the United States. NIST disseminates the time using several methods, including radio broadcasting over short-wave and long-wave frequencies, telephone dial-in services (ACTS), and Network Time Service (NTS) over the internet. This tutorial describes how to build an ESP8266-based internet clock that uses NIST’s NTS service to retrieve accurate time information. The time is displayed on a colorful TFT LCD (ILI9341 driven) in both analog clock dial and digital formats. The time is synchronized to the NIST server in every 2-minute interval. Hardware This project uses an ESP8266 module to connect to

Tutorial 7: ESP8266 and ILI9341 TFT LCD

Posted on February 7, 2017 by R-B 3 comments

In tutorial 3, we discussed how to use an SSD1306-driven I2C OLED screen with EasyESP-1 for displaying basic text and graphics. We used a 0.96″ (along the diagonal) 128×64 monochrome pixels OLED display for illustration. Despite its small size, the readability was pretty good due to its high contrast, which makes it a very good, compact size display for general applications. The excitement of having a display screen in an ESP8266 project can be further enhanced by upgrading the choice of display to colorful TFT LCD. One such screen that is readily available in the market at affordable price is ILI9341

Animated IoT clock that can’t be trusted

Posted on February 7, 2017 by R-B Leave a comment

An animated IoT clock shared by Tobozo Tagada does not use any RTC module orconnect to a NTP server to retrieve the time. It rather scans the open WiFi access points in its surrounding and extract the date/time from the “Date” HTTP header, if sent out by some. Trust this clock’s accuracy at your own risk. It uses WeMOS ESP8266 board and an OLED screen to display the time along with a pong animation in the background to “cut on the boringness of the clock”, as he said. Expecting unknown networks to provide a HTTP header value and relying on it to estimate time

WiFi deauthentication attacker using ESP8266

Posted on February 6, 2017 by R-B Leave a comment

The IEEE 802.11 (Wi-Fi) protocol contains a so-called deauthentication frame that are used as management frames to disconnect the links between stations and access points. Because management frames are often unencrypted, it is fairly easy to perform deauthentication attacks using a WiFi device by spoofing the MAC address of the access point. Alternatively, it can also be done by sending deauthentication frames to the access point with a clients’ MAC address as a destination. Spacehuhn has shared his ESP8266 based implementation of a deauthentication attacker on Github. It can disconnect any client from a network by repeatedly sending fake deauthentication frames. The attacker does not

ESP8266 weather station with e-paper display

Posted on February 5, 2017 by R-B 4 comments

A very cool-looking weather station using the ESP8266 WiFi module chip and a high resolution 7.4″ a-Si TFT active matrix Electronic Paper Display (EPD) module from Pervasive Displays shared by andrei7c4. The weather data are gathered from OpenWeatherMap service. Most of the time the device stays in deep sleep mode consuming only 18 µA. While updating the weather power consumption varies from 80 to 150 mA. Update operation takes a few seconds, depending on WiFi router, DHCP server and internet connection speed. With 30 minute update interval 3000 mAh battery should last for a few months on one charge.

« Older Entries Recent Entries »