Bremme Library and Temp to 1 decimal 7 segment

Projects Programming
1

Hi there,

I'm using two tm1637 7segment 4 digit displays to display the temperatures of two ds18b20 sensors.

I have been using the bremme tm1637 library due to the ease of using LCD.Print style commands.

Bremme Library

I can get the displays to show whole number temps fine using

 display1.print(tempC0, 0);

However I'm trying to get it to show '24.2' for example as the temp but ive tried

display1.print(tempC0, 1); which the lcd.print library documentation states, but it just ends up showing '_4' instead?

Any ideas? My whole code is below. Need to figure out switching the decimal on as well.

#include <OneWire.h>
#include <DallasTemperature.h>
#include "SevenSegmentTM1637.h"
#include "SevenSegmentExtended.h"




#define ONE_WIRE_BUS 2

OneWire oneWire(ONE_WIRE_BUS);

DallasTemperature sensors(&oneWire);

//7Segment stuff
//1st Display
const byte PIN_CLK = 3;   // define CLK pin (any digital pin)
const byte PIN_DIO = 4;   // define DIO pin (any digital pin)
SevenSegmentExtended      display1(PIN_CLK, PIN_DIO);
//2nd Display
const byte PIN_CLK1 = 5;   // define CLK pin (any digital pin)
const byte PIN_DIO1 = 6;   // define DIO pin (any digital pin)
SevenSegmentExtended      display2(PIN_CLK1, PIN_DIO1);


float tempC0 = 0;
float tempC1 = 0;


void setup() {

  //7 Segment Setup stuff
  //Display1
  display1.begin();            // initializes the display
  display1.setBacklight(100);  // set the brightness to 100 %
  display1.clear();
  delay(1000);                // wait 1000 ms

  //Display2
  display2.begin();            // initializes the display
  display2.setBacklight(100);  // set the brightness to 100 %
  display2.clear();
  delay(1000);

  sensors.begin();
  pinMode(3, OUTPUT);
  analogWrite(3, 0);
  Serial.begin(9600);

}

void loop() {
  sensors.requestTemperatures();
  tempC0 = sensors.getTempCByIndex(0);
  tempC1 = sensors.getTempCByIndex(1);
  delay(1000);
  Serial.println(tempC0);
  Serial.println(tempC1);
  //display1.setColonOn(true);
  display1.print(tempC0, 0);
  display2.print(tempC1, 0);
  delay(1000);
}
2

Try using dtostrf() to convert the float to a string, with as many decimal places as you like.

Then, print() that string to the display. Is the issue that it doesn't handle the '.' properly?

3

PaulS:
Is the issue that it doesn't handle the '.' properly?

You may have a point there (no pun intended)

Thanks for the advice, looking up dtostrf() examples now