SMA-Sunnyboy-reader

[prutz]

Hi,

For my SMA Sunnyboy Solar inverter I wanted to make a Huzzah Feather ESP8266 with a display to show first row the wattage and second row yield of the day.

I'm using this sketch: GitHub - pkoerber/SMA-SunnyBoy-Reader: Reading a SMA SunnyBoy solar inverter with an esp8266 or esp32
Did got some problems with compiling but after downgrading the ESP8266 software I got it working. Yippie!

Now I want to modify the demo sketch to suit my idea. Played around for a while to get watts and day yield to display but couldn't get it working.

Full code: SMA-SunnyBoy-Reader/SMAReader_Demo.ino at main · pkoerber/SMA-SunnyBoy-Reader · GitHub

My code which is shorten and added the include LCD :

void loop() {
    // wait for WiFi connection
    if(WiFi.status() == WL_CONNECTED) {
    
      // getValues int example
      String keys[2]={KEY_POWER, KEY_ENERGY_TODAY};
      int values[2];
      bool isSuccess=smaReader.getValues(2, keys, values);
      Serial.printf("Getting values: %s\n", isSuccess?"success":"fail");
      if(isSuccess) {
         for(int val: values) {            
            Serial.printf("Value: %d\n", val);

        lcd.setCursor(0, 0);              // I added this
        lcd.printf("Value: %d\n", val);   // I added this

         }
    }

..........................

What I know so far:

The array keys[2]: So under keys[0] is KEY_POWER and keys [1] KEY_ENERGY_TODAY, right?

The KEY_POWER and KEY_ENERGY_TODAY consist of key numbers (6100_40263F00 and 6400_00262200). This is were the value is stored.

Serial is showing:
Value=-1 is KEY_POWER (no sun atm) in watts
Value= 1688 is KEY_POWER_TODAY in Watt/h today.

17:15:32.983 -> Getting values: success
17:15:33.030 -> Value: -1     
17:15:33.030 -> Value: 1688

LCD Display now is just showing "Value: 1688 (and a weird chinese sign)".

As I don't get how the code works I find it difficult to get the LCD working properly and hoping someone could explain what exactly happens in de code.

.......................

I'll try to explain my self how to code works:

bool isSuccess=smaReader.getValues(2, keys, values);

This is the function that loads the values of the keys into the array and gives out a success or fail when it worked or not?

      if(isSuccess) {
         for(int val: values) {            
            Serial.printf("Value: %d\n", val);

If loading the values into the array was sucessfull it prints out the values to the serial.

This is where I get lost.. Even I only see one time Serial.printf in the code it does print out both key vallues.

Normally you will see an array[i]++ or i<2:i+1 or something like that. But this seems to work very different.

Also the colon in this line is confusing.

for(int val: values) {  

Hope someone can give me a little push in the back

[anon73444976]

@prutz

lcd.printf("Value: %d\n"

Maybe lose the newline?

@prutz

for(int val: values) {

It's an iterator; the variable val takes the value of each of the elements of the array values in turn.

[sterretje]

@prutz, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advise on) your project See About the Installation & Troubleshooting category.

[prutz]

@sterretje Thanks for moving it to the right location!

@anon73444976

Well I would like to display the vallues on the LCD. How could I extract/parse the values to an interger? So I can for example do this: (Compiling gives an error)

int WN_Watt: KEY_POWER; 
int DY_Watt: KEY_ENERGY_TODAY; 

        lcd.setCursor(0, 0);                      // Print to first row of LCD
        lcd.printf("Watts: %d\n", WN_Watt);       // Watts producing at the moment
        lcd.setCursor(0, 1);                      // Print to second row of LCD
        lcd.printf("Day yield: %d\n", DY_Watt)    // Day yield in Watts/h

[anon73444976]

I wouldn't ever use a newline on an LCD, unless I knew the driver supported it

@prutz

and a weird chinese sign

It looks to me like yours doesn't.

@prutz

int WN_Watt: KEY_POWER;

Not sure what that is
Did you mean '::' ?

[prutz]

This is the LCD I'm using: Grove - 16x2 LCD - Seeed Wiki
And the driver I've installed: GitHub - Seeed-Studio/Grove_LCD_RGB_Backlight: Seeedstudio, Grove - LCD RGB Backlight

I would like to get the int values out of KEY_POWER and KEY_ENERGY_TODAY keys.
For example:
When the solar has produced 1688 W/h this value (1688) will be stored under KEY_ENERGY_TODAY.
The KEY_ENERGY_TODAY value that to be copied to the new int called 'DY_Watt'. And the same for KEY_POWER to 'WN_Watt'.

I do somehow get that 'val' copies the 'values' but still is a mystery how to get the values out separate.

edit...

ooh sorry! now I get what you mean with newline. Getting rid of '/n'.

edit no.2

Removing /n did the job by removing the strange character.