ESP32 Oscilloscope clock using internal DACs, with WiFi ntp sync
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README.md

ESP32 Oscilloscope Clock by Mauro Pintus

ESP32 Oscilloscope Clock using internal DACs, with WiFi ntp sync

Mauro Pintus , Milano 2018/05/25

How to use it:

Load this sketch on a ESP32 board using the Arduino IDE 1.8.7 See Andreas Spiess video linked below if you don't know how to... Connect your oscilloscope channels to GPIO25 and GPIO26 of the ESP32 Connect the ground of the oscilloscope to the GND of the ESP32 board Put your Oscilloscope in XY mode Adjust the vertical scale of the used channels to fit the clock

Enjoy Your new Oscilloscope Clock!!! :)

Additional notes:

NTP Sync

By default this sketch will start from a fix time 10:08:37 everityme you reset the board.

To change it, modify the variables h,m,s below. To synchronize the clock with an NTP server, you have to install the library NTPtimeESP from Andreas Spiess. Then ncomment the line //#define NTP, removing the //. Edit the WiFi credential in place of Your SSID and Your PASS. Check in the serial monitor if it can reach the NTP server. You mignt need to chouse a different pool server for your country.

The NTPtimeESP library was meant for the ESP8266 and you need to adit the file NTPtimeESP.h to use it with the ESP32. Open up the "NTPtimeESP.h" inside the library and replace the "#include <ESP8266WiFi.h>" with "#include <WiFi.h>".

TimeZone Change

You needed to modify the "NTPch.getNTPtime(1.0, 1);" request to fit your TimeZone. Simply change the first argument with your required GMT offset. So for Italy (GMT +1) I've set it to 1.0. For Pacific Coastal Zone (GMT -8), you need to change "NTPch.getNTPtime(1.0, 1);" to "NTPch.getNTPtime(-8.0, 1);".

EXCEL XY Coordinates Test

If you want there is also a special mode that can be enabled uncommenting the line //#define EXCEL, removing the //. In this mode, the sketch will run once and will output on the serial monitor all the coordinates it has generated. You can use this coordinates to draw the clock using the graph function in Excel or LibreOffice This is useful to test anything you want to display on the oscilloscope to verify the actual points that will be generated.

GitHub Repository https://github.com/maurohh/ESP32_OscilloscopeClock

Twitter Page https://twitter.com/PintusMauro

Youtube Channel www.youtube.com/channel/UCZ93JYpVb9rEbg5cbcVG_WA/

Old Web Site www.mauroh.com

Credits: Andreas Spiess https://www.youtube.com/watch?v=DgaKlh081tU

Andreas Spiess NTP Library https://github.com/SensorsIot/NTPtimeESP

My project is based on this one: http://www.dutchtronix.com/ScopeClock.htm

Thank you!!