Published April 6, 2025 © GPL3+

CPU Temperature Monitor with OLED Display & Pi Pico/ Pico W

Display the real-time internal temperature of the Raspberry Pi Pico W on an SH1106 OLED using Arduino IDE.

BeginnerFull instructions provided30 minutes350

CPU Temperature Monitor with OLED Display & Pi Pico/ Pico W

Things used in this project

Hardware components

Raspberry Pi Pico W

Breadboard (generic)

Jumper wires (generic)

1.3 INCH OLED (SH1106) display module

Software apps and online services

Arduino IDE

Story

Overview

In this project, we’ll use the onboard temperature sensor of the Raspberry Pi Pico W and display the live CPU temperature on a 1.3” SH1106 OLED screen via I2C. This is a simple yet practical introduction to sensor readings, I2C display interfacing, and Arduino programming on the Pi Pico W.

New to uploading code to the Pico W?

Check out my previous beginner-friendly guide: https://www.hackster.io/Ameya_Angadi/getting-started-with-raspberry-pi-pico-in-arduino-ide-40c4a8

Step 1: Make all the connections

Follow this circuit diagram to make all the connections

Step 2: Install Required Libraries in Arduino IDE

In Arduino IDE, go to Sketch > Include Library > Manage Libraries, and install:

Adafruit_GFX
Adafruit_SH110X

Step 3: Select Board & Port

Go to Tools > Board > Raspberry Pi RP2040 Boards > Raspberry Pi Pico W

Select the correct COM port

Step 4: Upload the Code

Upload the code attached below to read the internal temperature and display it on the OLED.

Done!

You now have a real-time CPU temperature monitor displayed on a slick OLED screen, powered by the Raspberry Pi Pico W and programmed entirely in C++ using the Arduino IDE.

Final Output Images

1 / 3

Watch the final output of the CPU Temperature Monitor in this short demo video:

If you want to explore more, check out my profile for related projects, and don’t forget to follow me for updates on new tutorials and advanced projects!

Code

CPU Temperature Monitor

/*
 * Project Name: CPU Temperature Monitor
 * Designed For: Raspberry Pi Pico / Pico W
 *
 *
 * License: GPL3+
 * This project is licensed under the GNU General Public License v3.0 or later.
 * You are free to use, modify, and distribute this software under the terms
 * of the GPL, as long as you preserve the original license and credit the original
 * author. For more details, see <https://www.gnu.org/licenses/gpl-3.0.en.html>.
 *
 * Copyright (C) 2025  Ameya Angadi
 *
 * Code Created And Maintained By: Ameya Angadi
 * Last Modified On: April 06, 2025
 * Version: 1.0.0
 *
 */


#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SH110X.h>

/* 
   Configure the I2C address for the OLED screen. Uncomment only one option below. 
   If the screen does not display correctly, switch to the other address.
   SH110X-based OLED displays commonly use I2C addresses 0x3C or 0x3D.
*/

#define OLED_I2C_ADDRESS 0x3C  // Set the I2C address to 0x3C for the OLED screen
//#define OLED_I2C_ADDRESS 0x3D   // Set the I2C address to 0x3D if 0x3C doesn't work

#define DISPLAY_WIDTH 128  // Width of the OLED screen in pixels
#define DISPLAY_HEIGHT 64  // Height of the OLED screen in pixels
#define OLED_RESET -1      // Reset pin is not used (-1 indicates no reset pin)

Adafruit_SH1106G display = Adafruit_SH1106G(DISPLAY_WIDTH, DISPLAY_HEIGHT, &Wire, OLED_RESET);
float temp = 0;

#define SPLASH_SCREEN_HEIGHT 64
#define SPLASH_SCREEN_WIDTH 128
static const unsigned char PROGMEM splash_screen_bmp[] =
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
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  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};

void setup() {
  delay(250);  // wait for the OLED to power up
  display.begin(OLED_I2C_ADDRESS, true);
  display.clearDisplay();
  display.setTextColor(SH110X_WHITE);
  display.drawBitmap(0, 0, splash_screen_bmp, 128, 64, 1);  //Displays the Splash Screen
  display.display();
  delay(3000);
}

void loop() {
  temp = analogReadTemp();
  display.clearDisplay();
  display.drawRect(2, 2, 126, 62, SH110X_WHITE);
  display.setTextSize(2);
  display.setCursor(15, 15);
  display.println("CPU Temp:");
  display.setTextSize(2);
  display.setCursor(25, 35);
  display.println(String(temp, 2));
  display.setCursor(90, 35);
  display.print("C");
  display.display();
  delay(750);   //Small delay between the readings
}