You actually need to replace the display board with a new LCD. The project is based on the low cost ESP32 development board. The board WT32-SC01 with 3.5 inch 320x480 capacitive multi-touch LCD Screen and built-in Wifi.
Also you need an external wifi antenna and a DC-DC converter (12v -> 5v, 1A).
There are two options for the board:
- WT32-SC01 - recommended
- WT32-SC01 PLUS - is not recommended due to its size.
Click to view where to buy
Aliexpress pages: + https://aliexpress.ru/item/1005003745843708.html + https://aliexpress.ru/item/1005004267336768.html + https://aliexpress.ru/item/1005003297175908.html + https://aliexpress.ru/item/1005003880321464.html- Use finished firmware files from the folder Binary. Upload Flash Download Tools from official page: https://www.espressif.com/en/support/download/other-tools Connect USB cable to your development board, run the application, select COM port and bin-files. When download is completed push "RST" (Reset) button to restart your dev board.
- Use Visual Studio Code + Platformio. Open project from VSCode folder. Build and upload the project.
Click to view Flash Download Tools
The project is suitable for all models KA3005D and KA3005P. Models without programmable control (KA3005D) will work, but you will not be able to control the current values and voltage.
Although KORAD3005D is not intended for programmable control, nevertheless, some of the devices can work like KORAD3005P. Under the cover on the printed circuit board there is a connector for communication via UART. Let's call such devices that can be controlled via UART KORAD3005DP. To see the difference between KORAD3005D and KORAD3005DP, just listen to it. Watch this short video and you will hear the difference.
All schematics can be found in the Schematics folder.
- J4 (korad main board) connecting display board
- J9 (korad main board) connecting interface board
You can change the user inteface using SquareLine Studio. SquareLine Studio is a wonderful product. But if you do not plan to change the user interface, you can do without SquareLine Studio. All you need is Visual Studio Code with Platformio.
The UI project is in the SquareLine folder. Change File->Project Settings, FILE EXPORT, Project Export Root and UI File Export Path to your correct folders.
Click to view SquareLine Studio Project Settings
Yellow is highlighted the clickable areas. On the first screen you can change between (W) Watts and (R) Resistance.
On the third screen you can change the oscilloscope mode: -> Single voltage beam -> Single current beam -> Both beams. Voltage ahead -> Both beams. Current ahead ->
- Wi-Fi. ON or OFF. If ON you can enter wifi settings.
- Energy auto reset. If ON it resets the energy and time counters every time when the output is on.
- Programmable KA3005P/DP. If ON Lets programmable interface.
- Block when output is ON. If OFF Lets programmable interface when the output is on.
- Exterior. Enters the exterior screen.
- Screensaver. If ON dim the backlight in some minutes after the last usage.
- Beeper. The buzzer volume.
At the left pane you can change the colors for: CC mode, CV mode and so on. At the right pane you can change the fonts: Segment, Electro, Roboro. Default button restores default exterior.
- Shift depends of decimal bit synchro pulse connected to dev board.
- Before/After edge. The data is before or after the decimal bit synchro pulse.
- Revers. Data sequence is 1234 or 4321.
- Prescaler. Frequency divider for the update rate of 7-segment display. KA3005D updates the 7-segment display 200 times a second, so you need prescaler 10...20. KA3005DP or KA3005P needs 2...5 prescaler.
Enter KORAD's local IP address in you browser.
- WiFi: In the DPSmaster application select "TCP" and enter correct KORAD's local IP address.
- USB: In the DPSmaster application select correct COM-port. Baud rate 115200, slave address 1.
DPSmaster officail page: https://profimaxblog.ru/dpsmaster/
DPSmaster full review: https://youtu.be/1nZQ2FA08Fg
Modbus RTU/TCP protocol: https://profimaxblog.ru/modbus-communication-protocol-2/
You need an additional UART-USB converter for debug and modbus communication with DPSmaster.
Click to view schematics
Add #include <math.h> in the automaticaly generated ui_DebugScreen.c file.
You can debug the software via USB (Serial at speed 115200).
In platformio.ini file uncomment the line and set desired level. See ESP-IDF Logging library.
-DCORE_DEBUG_LEVEL=4
means
#define CORE_DEBUG_LEVEL=4
In korad.h file uncomment the line
//#define DEBUG_WITH_OSCILL
for debug with an external oscilloscope. In this case UART Rx and TX pins use as outputs to monitor a delay in software after the decimal bit synchro pulse.
In modbus.cpp file uncomment one of lines if you need modbus messages.
//#define MB_DEBUG
//#define KORAD_DEBUG_TX
//#define KORAD_DEBUG_RX
Click to open
Fonts creating:https://tophix.com/font-tools/font-editor
https://www.glyphrstudio.com/online/
https://lvgl.io/tools/fontconverter
HTML compressor:
https://htmlcompressor.com/compressor/
External WiFi antenna: