ATTiny memory and libraries

Projects General Guidance
5

I have actually done something like this a few years ago! Using an ATTiny85 to just display temp when it is powered on. Made a small portable temp sensor for getting temp readings from my hottub or pool. Even using it for my fish tank. Here is the code that I made long ago.

 /*  Runnig on ATTiny85 @ Internal 8Mhz
             ┌ ─ ─ ─ ─ ─ ┐
     Reset   |1   ()    8|   5V
     A3  3   |2         7|  2  A1
     A2  4   |3         6|  1  PWM1
       GND   |4         5|  0  PWM0
             └ ─ ─ ─ ─ ─ ┘

 * Physical pin 2 (3) [A3]
 * Physical pin 3 (4) [A2]
 * Physical pin 5 (0) [PWM0]
 * Physical pin 6 (1) [PWM1]
 * Physical pin 7 (2) [A1]
 */
#include <TinyWireM.h> 
#include <OneWire.h>
#include <DallasTemperature.h>
#define ONE_WIRE_BUS 3 //Physical pin 2 (A3)
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
/*
 How many bits to use for temperature values: 9, 10, 11 or 12
   9 bits: increments of 0.5C, 93.75ms to measure temperature
   10 bits: increments of 0.25C, 187.5ms to measure temperature
   11 bits: increments of 0.125C, 375ms to measure temperature
   12 bits: increments of 0.0625C, 750ms to measure temperature
*/
#define SENSOR_RESOLUTION 12
DeviceAddress sensorDeviceAddress;


#include <Tiny4kOLED.h>
#include "font16x32digits.h"
const DCfont *currentFont = FONT16X32DIGITS;

void setup() {
  TinyWireM.begin(); 
sensors.begin();
  sensors.getAddress(sensorDeviceAddress, 0);
  sensors.setResolution(sensorDeviceAddress, SENSOR_RESOLUTION);
  sensors.requestTemperatures();
oled.begin();
//oled.begin(128, 64, sizeof(tiny4koled_init_128x64br), tiny4koled_init_128x64br);
oled.setRotation(1);     // Screen orientation 
  oled.setFont(FONT16X32DIGITS); // 1 row of 8 characters exactly fills 128x32
  
  oled.clear();
 oled.print(F("TEMP SENS"));

 oled.on();
 oled.switchRenderFrame();
 
   // Position the cusror
  // usage: oled.setCursor(X IN PIXELS, Y IN ROWS OF 8 PIXELS STARTING WITH 0);
  oled.setCursor(12, 0);

 oled.print(F(".SENSOR."));
  oled.switchRenderFrame();

 
} // END SETUP

void loop() {
  static int lastchk;
  if (sensors.getDS18Count() != 0) {
    sensors.requestTemperatures();
    oled.clear();
    oled.setCursor(25, 0);
    oled.print(sensors.getTempFByIndex(0));
    oled.switchRenderFrame();
  }

    
} // END LOOP