A date-time display on ESP32 using a DS3231 Real-Time Clock

In ham-radio digital mode transmissions some protocols (WSPR, FT8, …) require a synchronization of the order of one second between all stations.

To have an accurate time on ESP32 there are several solutions:
– the connection to an NTP server,
– the connection to a GPS,
– the use of a saved real-time clock,
– a combination of several methods.

The first two solutions involve either being connected to a network (WiFi, …) or to be able to receive GPS signals which is not always possible.

This article presents the realization of a date-time display on an ESP32 TTGO T-Display using a saved DS3231 real-time clock.

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FT-857D CAT from a web browser
Functional aspects

A hamradio station remote control is usually done by an application installed on a dedicated machine, this application being often developed according to an operating system (Windows, Unix, …). This video shows a FT-857D remote control using an application developed on a web browser and therefore independent of the system. The web server is an ESP32 TTGO micro-controller board connected to the FT-857D.

The developments are based on those described in the article on FT-857D parameters display on an ESP32 board.

The video presents the developments functional aspects.

The video is in French but is subtitled in English.

YAESU FT-857D parameters display on a TTGO-T-Display

The work was to port the FT-857D CAT library and the corresponding display application on the ESP32 T-Display. This software was originally developed on an Arduino Nano (see article) The goal was to have a platform of the same size as the Arduino Nano but with in addition to the serial link, an on-board WiFi and Bluetooth.

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First steps with ESP32: TTGO T-Display demo app

A TTGO T-Display demo app is available on Github/LilyGO.

This application:
– displays an image and then a timed sequence of screens of different colors (red, blue, green),
– displays the power voltage on short-pressed GPIO 35 button,
– puts the ESP32 to sleep on the GPIO 35 button long press,
– launches a WiFi scan on short press of the GPIO 0 button and displays the result.

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