Balboa-GS510SZ with panel VL700S

Software

version 1.3

• New example sketch for Home Assistant users, thank you netmindz

version 1.2

• Updated a failure of the intepretation of "9" in Balboa_GS_Interface.cpp
• Changed to ElegantOTA in Balboa_GS_MQTT.ino
• Added Stop and Reset MQTT interface in Balboa_GS_MQTT.ino

version 1.1

• New function updateTemperature added to set a temperature value instead of "push" button x number of times
• Balboa_GS_MQTT sketch updated with AsyncElegantOTA

version 1.0

• Basic functionality to read and set status using a Balboa_GS developed library. Two examples are provided, first with simple read and set functionality and the second using MQTT for remote access.

RJ45 pins

PIN	Description
PIN 1	Functionality unclear!
PIN 2	Functionality unclear!
PIN 3	Button data
PIN 4	GND
PIN 5	Display data
PIN 6	Clock
PIN 7	5 VDC
PIN 8	Floating output

Measurements

PIN 1 and 2

PWM output from control system, same on both pins. Unclear functionality for these PINs still! Maybe some internal light supply?

50Hz, pk-pk=18v, mean 5V

PIN 6 (Yellow - clock), PIN 5 (Blue - display data), PIN 3 (Pink - button data)

Conclusion

• The clock is pulsing 7 times for each chunck of display data, totaly 39 bits and 3 times for button data. A complete cycle 42 pulses.
  
• Totaly of 6 display data chunks in each cycle
  
• Each cycle is repeted every 20 ms
  
• One total cycle duration 1.88 ms
• Bit duration for display data is 10 microseconds for display data
  
• Bit duration for button data is 60 microseconds
  

Display Data

Display shows 37.5C - How does that translates into the bitstream? The first 4 chunks is coded in BCD to 7 segment LCD (see reference) but only with 7 bits sinse the LSB always is (0).
3 = 1111001(0) = 0x79 (Chunk 1)
7 = 1110000(0) = 0x70 (Chunk 2)
5 = 1011011(0) = 0x5B (Chunk 3)
C = 1001110(0) = 0x4E (Chunk 4)

Chunk 1 - bit(0-6)	Chunk 2 - bit(7-13)	Chunk 3 - bit(14-20)	Chunk 4 - bit(21-27)	Chunk 5 - bit(28-34)	Chunk 6 - bit(35-38)
LCD segment 1	LCD segment 2	LCD Segment 3	LCD segment 4	28 - Button down/up	35 - Heater
				29 - ?	36 - Pump 1
				30 - ?	37 - Pump 2
				31 - Standard mode	38 - Light
				32 - ?
				33 - ?
				34 - ?

Button data

Button	Decoding bit(0-2)
Mode	0 0 1
Temp up	1 0 0
Temp down	1 0 1
Light	0 1 1
Pump 1	1 1 0
Pump 2	0 1 0
Pump 3	1 1 1

Wiring

Since the display and controler unit hardware design is unknown an OR-gate is used to prevent damage if simultaneous HIGH/LOW levels from display and Arduino.

PCB fabrication

Gerber files located here: PCB Balboa-GS510SZ

References of great help!

• https://github.com/NickB1/OpenSpa/blob/master/documents/Balboa/Balboa_Display_Measurements.pdf
• https://www.olivierhill.ca/archives/72-The-Internet-of-Spas.html
• https://create.arduino.cc/projecthub/meljr/7-segment-led-displays-102-using-a-shift-register-6b6976

Other Balboa projects

• GL2000 Series https://github.com/netmindz/balboa_GL_ML_spa_control
• BP Series https://github.com/ccutrer/balboa_worldwide_app
• GS523SZ https://github.com/Shuraxxx/-Balboa-GS523SZ-with-panel-VL801D-DeluxeSerie--MQTT