MAATHES THILAK K

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MAATHES THILAK K

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Components

	ATTINY85V-10SU MICROCHIP	x 1
	SSD1306 OLED	x 1
	Micro USB	x 1
	430182130816 Würth Elektronik	x 1
	SMD CAPACTORS	x 1
	SMD RESISTORS	x 1

Tools, APP Software Used etc.

KiCad 9.0

Description

Attiny85-Powered Mini Oscilloscope

This project presents a compact, cost-effective mini oscilloscope PCB powered by the ATtiny85 microcontroller. The design emphasizes simplicity and ease of fabrication, making it particularly suitable for students, hobbyists, and anyone passionate about embedded systems and electronics. Developed entirely in KiCad, the PCB integrates essential components to visualize low-frequency signals without the need for complex instrumentation.

The core of the system is the ATtiny85, chosen for its low power consumption, small footprint, and sufficient capability to handle basic signal acquisition tasks. With minimal external circuitry, this design demonstrates how microcontroller-based solutions can be adapted for fundamental measurement tools. The result is a straightforward but functional oscilloscope platform that encourages experimentation and learning.

Intended primarily as an educational and experimental instrument, this mini oscilloscope is not a replacement for professional lab equipment. Instead, it provides an accessible entry point into signal visualization and embedded measurement systems. By sharing the complete design files and resources, this project invites the community to explore, modify, and improve upon the concept.

Code

Arduino

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SH1106.h>

#define OLED_RESET -1
Adafruit_SH1106 oled(OLED_RESET);

// -------- CONFIG --------
#define ADC_SIGNAL A1   // PB2
#define ADC_BUTTON A3   // PB3
#define LED_PIN    4    // PB4

#define REC_LEN 100     // reduced for SRAM safety

int wave[REC_LEN];

// -------- BUTTON STATES --------
enum Button {
  BTN_NONE,
  BTN_SELECT,
  BTN_UP,
  BTN_DOWN,
  BTN_HOLD
};

bool hold = false;
int vRange = 5;
int hRange = 3;

// -------- BUTTON READ --------
Button readButton() {
  int val = analogRead(ADC_BUTTON);

  if (val < 80) return BTN_SELECT;
  else if (val < 250) return BTN_UP;
  else if (val < 450) return BTN_DOWN;
  else if (val < 650) return BTN_HOLD;
  else return BTN_NONE;
}

// -------- SETUP --------
void setup() {
  pinMode(LED_PIN, OUTPUT);

  analogReference(INTERNAL); // 1.1V reference

  oled.begin(SH1106_SWITCHCAPVCC, 0x3C);
  oled.clearDisplay();

  oled.setTextSize(1);
  oled.setCursor(20, 20);
  oled.print("Mini Scope");
  oled.display();

  delay(1000);
}

// -------- READ WAVE --------
void readWave() {
  digitalWrite(LED_PIN, HIGH);

  for (int i = 0; i < REC_LEN; i++) {
    wave[i] = analogRead(ADC_SIGNAL);
    delayMicroseconds(200); // basic sampling
  }

  digitalWrite(LED_PIN, LOW);
}

// -------- PROCESS --------
int minVal, maxVal;

void analyze() {
  minVal = 1023;
  maxVal = 0;

  for (int i = 0; i < REC_LEN; i++) {
    if (wave[i] < minVal) minVal = wave[i];
    if (wave[i] > maxVal) maxVal = wave[i];
  }
}

// -------- DRAW --------
void drawWave() {
  oled.clearDisplay();

  // grid
  for (int x = 0; x < 128; x += 10)
    oled.drawFastVLine(x, 0, 64, WHITE);

  for (int y = 0; y < 64; y += 10)
    oled.drawFastHLine(0, y, 128, WHITE);

  // waveform
  for (int i = 0; i < REC_LEN - 1; i++) {
    int y1 = map(wave[i], minVal, maxVal, 63, 0);
    int y2 = map(wave[i + 1], minVal, maxVal, 63, 0);

    oled.drawLine(i, y1, i + 1, y2, WHITE);
  }

  // info
  oled.setCursor(0, 0);
  oled.print("Min:");
  oled.print(minVal);

  oled.setCursor(64, 0);
  oled.print("Max:");
  oled.print(maxVal);

  if (hold) {
    oled.setCursor(40, 30);
    oled.print("HOLD");
  }

  oled.display();
}

// -------- BUTTON ACTION --------
void handleButton(Button b) {
  static unsigned long lastPress = 0;

  if (millis() - lastPress < 200) return; // debounce

  lastPress = millis();

  switch (b) {
    case BTN_SELECT:
      hold = !hold;
      break;

    case BTN_UP:
      vRange++;
      if (vRange > 9) vRange = 9;
      break;

    case BTN_DOWN:
      vRange--;
      if (vRange < 0) vRange = 0;
      break;

    case BTN_HOLD:
      hRange++;
      if (hRange > 9) hRange = 0;
      break;

    default:
      break;
  }
}

// -------- LOOP --------
void loop() {
  Button b = readButton();
  handleButton(b);

  if (!hold) {
    readWave();
    analyze();
  }

  drawWave();
}

Schematic and Layout

https://github.com/MAATHES-THILAK-K/Mini-Oscilloscope-/tree/main/ATTINY85_POWERED

CAD-Custom parts and enclosures

GrabCad - 3D MODEL

https://grabcad.com/library/attiny85-powered-mini-oscilloscope-1

Download Gerbers Download BOM(Bill of materials)

Jan 26,2026

209 views

Attiny85-Powered Mini Oscilloscope

ATtiny85-powered mini oscilloscope PCB for low-frequency signal visualization—compact, low-cost, and ideal for learning embedded measurement

209

Published: Jan 26,2026

Standard PCB

Download Gerber file 6

BOM(Bill of materials)

Centroid file

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