Open keukenrol opened 4 years ago
Hi,
I'm also interrested to find out how we can print a variable value. I would like to use you library to make a Instagram counter . thx
I was able to solve this, accidentally learning more C++ than I expected... (with apologies to real developers)...
basically, take your string input, and convert it to an array of unsigned char (the byte variables used by LEDText).
The initial initialization with a scroll method may actually be unnecessary, but it works.
So String -> char[] using strncpy (which handles potential overflows as the length of the string may vary at runtime) convert signed char[] -> const unsigned char[] pass to LEDText
void displayScrollingMessage(String message)
{
char msg_c[254];
unsigned char msg_uc[256] = {EFFECT_SCROLL_LEFT}; // Prepare for an array of unsigned char
strncpy(msg_c, message.c_str(), 254);
std::copy(msg_c+2, msg_c + 256, msg_uc); // Copy the char array to unsigned char, correctly converting
const unsigned char * TextMessage[] = { msg_uc }; // Compose the message String into an LED Text Message
ScrollingMsg.SetText(msg_uc, 255); // Finally, pass to ScrollingMsg
...
}
See this repo for an example: https://github.com/fadesibert/arduino_esp32_scroller
Hi
is it possible to display the value of a variable? Furthermore, is there a method to show it as static text? The text string is a constant at the moment, so I suppose this is not possible?
For example:
const unsigned char TxtDemo[] = {" GS: ", %d}; Behind GS i would like to show the value I send to the microcontroller. Something using the analogy of how you show an integer in C. @AaronLiddiment