Flip Display for Temperature

[jasonacox]

Incoming question:

I want to display temperature, and I want to turn the display upside down so I can use dot as degree and fourth digit to display C.
So I want to display 'C on the fourth segment all the time.

For degree C, I usually use the built-in degree mark - See code example:

TM1637TinyDisplay/examples/TM1637Demo/TM1637Demo.ino

Lines 384 to 389 in a4d07fb

	// Demo split screen for temperature
	display.showString("\xB0", 1, 3); // Degree Mark, length=1, position=3 (right)
	for (int x = -90; x < 200; x++) {
	display.showNumber(x, false, 3, 0); // Number, length=3, position=0 (left)
	delay(10);
	}

If you want to flip the display, use the function: flipDisplay()
See:

TM1637TinyDisplay/TM1637TinyDisplay.h

Lines 136 to 142 in a4d07fb

	//! Sets the orientation of the display.
	//!
	//! Setting this parameter to true will cause the rendering on digits to be displayed
	//! upside down.
	//!
	//! @param flip Flip display upside down true/false
	void flipDisplay(bool flip = true);

To set the “dot” you can use showNumberDec()
See:

TM1637TinyDisplay/examples/TM1637Test/TM1637Test.ino

Lines 220 to 224 in a4d07fb

	// Test all the dots
	for (k = 0; k <= 4; k++) {
	display.showNumberDec(0, (0x80 >> k), true);
	delay(TEST_DELAY);
	}

[jasonacox]

I think you did not realize what I really wanted. I want to use the decimal dot as a degree symbol. I did it with 2 digits, but
when i use 3 digits dot disappears.
You can see it in the images below and you can see code too.

#include <Arduino.h>
#include <TM1637TinyDisplay.h>

// Define the connections pins
#define CLK 9
#define DIO 8


TM1637TinyDisplay display(CLK, DIO);

void setup() {
   display.setBrightness(4); // Set brightness level (0-7)
  
  // Flip the display upside down
  display.flipDisplay(true);
  
  // Display 'C' with a decimal dot on the 4th digit
  uint8_t segments[] = {0x00, 0x00, 0b10000000, 0b00111001 }; 
  display.setSegments(segments);
}

void loop() {

  display.showNumber(22, false, 2, 0);  
  delay(1000); // Wait for 1 second
  

  display.showNumber(111, false, 3, 0);  
  delay(1000); // Wait for 1 second

}

[jasonacox]

Hi Filip,

You actually need to set the decimal on the third number, not on the "C". When you do the second showNumber() call, it erases the decimal.

You need to set the decimal when you set the number:

  k = 3; // Location for decimal
  display.showNumberDec(111, (0x80 >> k), false, 3, 0);