Overclocking Telemetry: The PC Stats Monitor

Checking the temperature of a massive RTX GPU requires pressing Alt+Tab out of an intense FPS video game, crashing the frame rate. The DIY PC Stats Monitor solves this by physically outsourcing the telemetry! It executes an incredible dual-architecture system: A massive C# or Python backend running on the 4GHz Windows PC violently sniffs the processor's temperature sensors, then blasts that payload over pure USB-Serial into a tiny Arduino Uno, which rapidly draws a secondary tactical screen!

The PC-Side Host Payload (WMI or HWINFO API)

The Arduino is utterly useless here; it knows absolutely nothing about the massive AMD or Intel processor running Windows 11.

1. The user must write a local Python script running permanently in the Windows Taskbar!
2. The Python code utilizes the <psutil> or <WMI> library to aggressively interrogate the motherboard.
3. gpu_temp = psutil.sensors_temperatures()['coretemp'][0].current
4. The Python script structures the massive telemetry into raw comma-delimited geometry: "C: 64, G: 81, R: 14" (CPU Temp, GPU Temp, RAM Usage%).
5. Using <import serial>, the script executes ser.write(payload.encode()) directly down the virtual COM4 USB cable at exactly 115200 baud!

Demuxing Serial and Drawing I2C Arrays

The Arduino Nano is taped directly to the inside glass window of the massive PC Tower case.

• The C++ code is trapped entirely inside an aggressive parser loop.
• It intercepts the massive Serial String, utilizing substring() to split integer datasets!

if (Serial.available()) {
  String dataString = Serial.readStringUntil('\n'); // Catch the whole payload!
  // Send the payload directly to the I2C pixel matrix!
  drawCPUBarGraph(cpuTempVariable); 
}

• The Screen Buffer Math: The Arduino uses <Adafruit_SSD1306.h>.
• To draw a "Loading Bar" that physically grows horizontally when the GPU hits 90C, you use fillRect().
• display.fillRect(10, 20, map(gpuTempVariable, 30, 100, 0, 100), 10, WHITE);
• The screen instantly redraws the visual geometric bar, creating an absolutely professional, secondary hardware-diagnostic display without affecting the Windows gaming frame buffer at all!

Host Integration Base Setup

• Arduino Nano (The physical micro-footprint is required! The Nano plugs via Mini-USB directly into an internal PC motherboard 9-pin USB header).
• 0.96" I2C OLED or 2.8" SPI TFT Display Block.
• A PC running a custom Python script or Open Hardware Monitor (OHM) plugins!
• 4-Pin Jumper cable routing the screen matrix power lines securely!