Buy your own clock under the name "EleksTube IPS Clock" on eBay, Banggood, etc. Look for places that offer 30-day guarantee, otherwise it can be a fake product!

Reddit discussion on the original hack is here.

Original documentation and software from EleksMaker.

• Partitions changed to 1MB / 3 MB for more space for images
• Changed menu to add support for changing clock faces in the menu
• BMP files (24 BPP) converted to 16BPP custom (.CLK) files which only have a header, size and pre-processed pixel data.
• Added pre-loading of next image into the buffer for faster refresh
• Loading time is down from original 150 ms to approx 30 ms
• Supports smaller images which are centered on displays
• Approx 5-7 clock faces can be loaded onto the clock
• Catching invalid NTP responses (does not initialize the clock with invalid time)
• Power button is used to exit the menu (same as on original clock)
• WPS Button mode is used to connect to the WiFi / router (no need to insert credentials into source code)
• Night time mode: dims displays and backlight during night time hours
• MQTT (IoT) support added - clock faces and on/off can be controlled with mobile phone (SmartNest, SmartThings, Google assistant, Alexa, etc.) or included in home automation network
• WiFi and MQTT errors are displayed below clock faces
• Updated and cleaned the original clock faces for a better user experience
• Location detection and automatic TimeZone and DST selection.
• Automatic counting number of clock faces loaded onto the clock (no need to rebuild firmware)
• Added support for original "EleksTube IPS clock" and "SI HAI clock" (chinese cknockoff)
• Added support for NovelLife SE clock -- without gesture sensor thus far
• Added option to use hard-coded WIFI credentials instead of WPS
• (in works: ) Integrated web server to input MQTT connection details (or maybe load new clock faces)

My coding does not keep up with objects, it is more "old school" inline style; please don't complain about that. I tried to write it quite clean. And most importantly: it works fine! :) If someone has courage and time to smash new code into boxes and objects, I'm fine with that.

Original EleksTube has a few problems in the hardware design. Most notably it forces 5V signals into ESP32 which is not happy about it. And it is outside of safe operating limits. This will extend the lifetime of ESP32. Mine died because of this...

CH340 chip, used for USB-UART conversion can operate both on 5V and 3.3V. On the board it is powered by 5V. Cut one trace on the bottom side of the board that supplies the chip with 5V and route 3.3V over the resistors / capacitors to VDD and VREF. See folder "Hardware modification" for the photo.

If you mess-up your clock, it's only your fault. Backup images from other uses DO NOT WORK as the firmware is locked by MAC address of ESP32.

EleksTube instructions instruct for installing a serial port driver. On Windows 10, plug-in the cable and run Windows Update. It will find and install the driver. On Linux it works out of the box.

• Install ESP32 support (see below)
• Navigate to folder \Arduino\..\packages\esp32\tools\esptool_py\3.0.0 or \original-firmware\
• Copy file \original-firmware\_ESP32 save flash 4MB.cmd and _ESP32 write flash.cmd to this folder
• Change COM port number inside both files
• Run "save flash" file and wait until it saves the contents of your flash to backup1.bin
• if you want to restore your original firmware run _ESP32 write flash.cmd

Unfortunately, it's not simple plug-and-play. You need to do some things. These instructions assume you already know how to use the Arduino IDE, and just need to know WHAT to do.

If you just want to use new firmware without setting up all the tools and libraries and everything, just navigate to folder \original-firmware\ and modify _ESP32 write flash.cmd to upload latest version (BUILD_ELEKSTUBE_xxxxxxx.bin) or (BUILD_SI_HAI_xxxxxxx.bin) to your clock.

Note that you will use my geolocation API key which has limited usage. If we all together exceed their free plan, it will stop working.

You're either reading this file after downloading it already, or you're reading it on github. I'll assume you can figure out how to get the code from github and put it somewhere on your local machine. This is your preference.

Development was done on Arduino 1.8.13. It might work on earlier or later versions, I don't know.

File -> Preferences, add https://dl.espressif.com/dl/package_esp32_index.json to your Board Manager URLs. (Comma separated if there's already something there.)

Tools -> Board -> Board Manager, add the esp32 boards by Espressif Systems. Development was done on v1.0.6.

Tools -> Board -> ESP32 Arduino -> ESP32 Dev Module

The default configs in the Tools menu should be fine. The important ones are:

• Flash Size: 4MB
• Partition Scheme: No OTA (1 MB app, 3 MB SPIFFS). To fit as many images as possible.
• Port: Set it to whatever serial port your clock shows up as when plugged in. See screenshot here: https://github.com/aly-fly/EleksTubeHAX/blob/main/EleksTubeHAX/_build_settings.png

All these libraries are in Library Manager. Several libraries have very similar names, so make sure you select the correct one based on the author. The listed "developed on" versions are just the versions I had installed while developing this code. Newer (or possibly older) versions should be fine too.

Sketch -> Include Library -> Library Manager

• NTPClient by Fabrice Weinberg (developed on v3.2.0)
• Adafruit NeoPixel by Adafruit (developed on v1.8.0)
• DS1307RTC by Michael Margolis (developed on v1.4.1)
• TFT_eSPI by Bodmer (developed on v2.3.61)
• Time by Michael Margolis (developed on v1.6.0)
• PubSubClient by Nick O'Leary (developed on v2.8.0) https://www.arduinolibraries.info/libraries/pub-sub-client
• ArduinoJson by Benoit Blanchon (worked on 6.19.4)

For "SI HAI clock" also add:

• RTC by Makuna (developed on 2.3.5) https://github.com/Makuna/Rtc/wiki

IPgeolocation and NTPclient libraries were coped into the project and heavily updated (mostly bug fixes and error-catching).

IMPORTANT You have to do this after every time you install or update the TFT_eSPI library! IMPORTANT

• Edit Arduino\..\libraries\TFT_eSPI\User_Setup_Select.h
• Comment out all #include lines. (The only one that comes from install is #include <User_Setup.h>.)
• Add a #include line pointing to GLOBAL_DEFINES.h in this code.
  • eg: #include "D:\<personal folder>\EleksTubeHAX\GLOBAL_DEFINES.h"
  • Obviously, update the path to point to where ever you keep your code. Mac and Linux paths will look very different.

The code is here, and instructions to install it are here.

tl,dr: Download and unzip this file (old file, reportedly not working) into your Arduino/tools/ directory. There might not be a tools/ subdirectory yet, but if you see Arduino/libraries/ that's the right place.

After installing the ESP32 support, all the libraries, and the SPIFFS uploader, restart Arduino to make sure it knows its all there.

Make sure you configured everything in USER_DEFINES.h.

• Your MQTT credentials :: Register on SmartNest.cz, create a Thermostat device, copy your username, API key and Thermostat Device ID.
• Uncomment MQTT service (if in use)
• Your Geolocation API :: Register on Abstract API, select Geolocation API and copy your API key.
• Select hardware platform (Elekstube, NovelLife, or SI_HAI) :: un-comment appropriate hardware define
• Select if you prefer WPS or hardcoded credentials for WIFI (comment 'WIFI_USE_WPS' line and add credentials if desired)
• Point User_Setup_Select.h in the TFT_eSPI library to GLOBAL_DEFINES.h

Connect the clock to your computer with USB. You'll see a new serial port pop up. Make sure that's the serial port selected in Tools.

Compile and upload the code. At this point, it should upload cleanly and successfully. You'll see the clock boot up and ask for WPS. But it doesn't have any bitmaps to display on the screen yet.

The repository comes with a set of CLK and BMP files, modified images from the original firmware, in the data/ directory. See below if you want to make your own.

Tools -> ESP32 Sketch Data Upload, will upload the files to the SPIFFS filesystem on the micro. They'll stay there, even if you re-upload the firmware multiple times.

If you want to change these:

• Create your own BMP files. Resolution must be max 135x240 pixels, 24bit RGB. Can be smaller, it will be centered on the display. Cut away and black border, this only eats away valuable Flash storage space!
• Name them 10.bmp through 19.bmp; 20.bmp to 29.bmp, and so on. You can add as many as you can fit into SPIFFS space.
• Run the tool \Prepare_images\Convert_BMP_to_CLK.exe
• Select all prepared BMP files at once. It will create CLK files with smaller size.
• Put them in the \data directory.
• Then do the "Tools -> ESP32 Sketch Data Upload" dance again. Each set (1x, 2x, etc) can be chosen in the menu.

For WPS: When prompted by the clock, press WPS button on your router (or in web-interface of your router). Clock will automatically connect to the WiFi and save data for future use. No need to input your credentials anywhere in the source code. THe clock will remember WiFi connection details even if you unplug the clock.

See SmittyHalibut on GitHub (original author of this alternative FW) for details.

My notes are in the document Hardware pinout.xlsx

Happy hacking!

• Aljaz