SP32-C3 Tiny OLED Tutorial: Pinout, Setup & First Programs

A tiny yet powerful ESP32-C3 board with a built-in OLED display.

Nov 11, 2025

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esp32-c3 with built in OLED

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Project description

Code

Display EUR/USD currency exchange rates

cpp

JSON form api.frankfurter.app API

1#include <Arduino.h>
2#include <WiFi.h>
3#include <WiFiClientSecure.h>
4#include <U8g2lib.h>
5#include <Wire.h>
6#include <ArduinoJson.h>
7
8// ---- WiFi settings ----
9const char* ssid = "Dziubym";
10const char* password = "Mikigosia1";
11
12// ---- OLED pins ----
13#define SDA_PIN 5
14#define SCL_PIN 6
15U8G2_SSD1306_72X40_ER_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
16
17// ---- HTTPS client ----
18WiFiClientSecure client;
19
20
21
22// ---- Display helper ----
23void drawOLEDMessage(const char* msg) {
24  u8g2.clearBuffer();
25  u8g2.setDrawColor(1);
26  u8g2.setFont(u8g2_font_5x8_tr);
27  u8g2.drawStr(0, 12, msg);
28  u8g2.sendBuffer();
29}
30
31String getEURtoUSD() {
32  client.setInsecure();
33  
34  if (!client.connect("api.frankfurter.app", 443)) {
35    return "Connection failed";
36  }
37
38  // Send HTTP GET request
39  client.print(
40    String("GET /latest?from=EUR&to=USD HTTP/1.1\r\n") +
41    "Host: api.frankfurter.app\r\n" +
42    "Connection: close\r\n\r\n"
43  );
44
45  // Wait for response
46  unsigned long timeout = millis();
47  while (!client.available()) {
48    if (millis() - timeout > 5000) { // 5s timeout
49      client.stop();
50      return "Timeout";
51    }
52    delay(10);
53  }
54
55  // Skip headers
56  while (client.available()) {
57    String line = client.readStringUntil('\n');
58    if (line == "\r") break;  // end of headers
59  }
60
61  // Read body
62  String payload = "";
63  while (client.available()) {
64    payload += client.readString();
65  }
66
67  client.stop();
68
69  // Parse JSON
70  DynamicJsonDocument doc(512);
71  DeserializationError error = deserializeJson(doc, payload);
72  if (error) {
73    return "JSON parse error";
74  }
75
76  float rate = doc["rates"]["USD"];
77  return "1EUR=" + String(rate, 4) + "USD";
78}
79
80
81void setup() {
82  Wire.begin(SDA_PIN, SCL_PIN);
83  u8g2.begin();
84
85  drawOLEDMessage("Connecting WiFi...");
86  WiFi.begin(ssid, password);
87  while (WiFi.status() != WL_CONNECTED) {
88    delay(300);
89  }
90}
91
92void loop() {
93  drawOLEDMessage("Fetching rate...");
94  String rate = getEURtoUSD();
95
96  // Display result
97  u8g2.clearBuffer();
98  u8g2.setDrawColor(1);
99  u8g2.setFont(u8g2_font_5x8_tr);
100  u8g2.drawStr(0, 10, "EUR->USD Rate:");
101  u8g2.drawStr(0, 30, rate.c_str());
102  u8g2.sendBuffer();
103
104  delay(3600000); // show result for 1h seconds before sleep
105}

#include <Arduino.h>
#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <U8g2lib.h>
#include <Wire.h>
#include <ArduinoJson.h>

// ---- WiFi settings ----
const char* ssid = "Dziubym";
const char* password = "Mikigosia1";

// ---- OLED pins ----
#define SDA_PIN 5
#define SCL_PIN 6
U8G2_SSD1306_72X40_ER_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);

// ---- HTTPS client ----
WiFiClientSecure client;



// ---- Display helper ----
void drawOLEDMessage(const char* msg) {
  u8g2.clearBuffer();
  u8g2.setDrawColor(1);
  u8g2.setFont(u8g2_font_5x8_tr);
  u8g2.drawStr(0, 12, msg);
  u8g2.sendBuffer();
}

String getEURtoUSD() {
  client.setInsecure();
  
  if (!client.connect("api.frankfurter.app", 443)) {
    return "Connection failed";
  }

  // Send HTTP GET request
  client.print(
    String("GET /latest?from=EUR&to=USD HTTP/1.1\r\n") +
    "Host: api.frankfurter.app\r\n" +
    "Connection: close\r\n\r\n"
  );

  // Wait for response
  unsigned long timeout = millis();
  while (!client.available()) {
    if (millis() - timeout > 5000) { // 5s timeout
      client.stop();
      return "Timeout";
    }
    delay(10);
  }

  // Skip headers
  while (client.available()) {
    String line = client.readStringUntil('\n');
    if (line == "\r") break;  // end of headers
  }

  // Read body
  String payload = "";
  while (client.available()) {
    payload += client.readString();
  }

  client.stop();

  // Parse JSON
  DynamicJsonDocument doc(512);
  DeserializationError error = deserializeJson(doc, payload);
  if (error) {
    return "JSON parse error";
  }

  float rate = doc["rates"]["USD"];
  return "1EUR=" + String(rate, 4) + "USD";
}


void setup() {
  Wire.begin(SDA_PIN, SCL_PIN);
  u8g2.begin();

  drawOLEDMessage("Connecting WiFi...");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(300);
  }
}

void loop() {
  drawOLEDMessage("Fetching rate...");
  String rate = getEURtoUSD();

  // Display result
  u8g2.clearBuffer();
  u8g2.setDrawColor(1);
  u8g2.setFont(u8g2_font_5x8_tr);
  u8g2.drawStr(0, 10, "EUR->USD Rate:");
  u8g2.drawStr(0, 30, rate.c_str());
  u8g2.sendBuffer();

  delay(3600000); // show result for 1h seconds before sleep
}

Hello World sketch

cpp

Sketch using U8g2lib.h library

1#include <Arduino.h>
2#include <U8g2lib.h>
3
4
5#include <Wire.h>
6
7#define SDA_PIN 5
8#define SCL_PIN 6
9
10
11U8G2_SSD1306_72X40_ER_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);   // EastRising 0.42" OLED
12
13void setup(void) {
14  Wire.begin(SDA_PIN, SCL_PIN);
15  u8g2.begin();
16}
17
18void loop(void) {
19  u8g2.clearBuffer();         // clear the internal memory
20  u8g2.setFont(u8g2_font_ncenB08_tr); // choose a suitable font
21  u8g2.drawStr(0,10,"Hello World!");  // write something to the internal memory
22  u8g2.sendBuffer();          // transfer internal memory to the display
23  delay(1000);  
24}

#include <Arduino.h>
#include <U8g2lib.h>


#include <Wire.h>

#define SDA_PIN 5
#define SCL_PIN 6


U8G2_SSD1306_72X40_ER_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);   // EastRising 0.42" OLED

void setup(void) {
  Wire.begin(SDA_PIN, SCL_PIN);
  u8g2.begin();
}

void loop(void) {
  u8g2.clearBuffer();         // clear the internal memory
  u8g2.setFont(u8g2_font_ncenB08_tr); // choose a suitable font
  u8g2.drawStr(0,10,"Hello World!");  // write something to the internal memory
  u8g2.sendBuffer();          // transfer internal memory to the display
  delay(1000);  
}

Hello world sketch using wrong libraries

cpp

Sketch using Adafruit libraries

1#include <Arduino.h>
2#include <Wire.h>
3#include <Adafruit_GFX.h>
4#include <Adafruit_SSD1306.h>
5
6#define SCREEN_WIDTH 72
7#define SCREEN_HEIGHT 40
8
9#define SDA_PIN 5
10#define SCL_PIN 6
11
12// If your display has no reset pin, use -1
13Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
14
15void setup() {
16  Wire.begin(SDA_PIN, SCL_PIN);
17  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
18}
19
20void loop() {
21  display.clearDisplay();
22  display.setTextSize(1);
23  display.setTextColor(SSD1306_WHITE);
24  display.setCursor(0, 10);
25  display.println("Hello World!");
26  display.display();   // Send buffer to display
27
28  delay(1000);
29}

#include <Arduino.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 72
#define SCREEN_HEIGHT 40

#define SDA_PIN 5
#define SCL_PIN 6

// If your display has no reset pin, use -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  Wire.begin(SDA_PIN, SCL_PIN);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
}

void loop() {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 10);
  display.println("Hello World!");
  display.display();   // Send buffer to display

  delay(1000);
}

Displaying Bitmap

cpp

Both correct band incorrect bit order

1#include <Arduino.h>
2#include <U8g2lib.h>
3#include <Wire.h>
4
5#define SDA_PIN 5
6#define SCL_PIN 6
7
8U8G2_SSD1306_72X40_ER_F_HW_I2C u8g2(U8G2_R0, U8X8_PIN_NONE);
9
10extern const unsigned char epd_bitmap_esp32_c3_graffiti_70x30[];
11// Incorrect bits order
12/*// 'esp32_c3_graffiti_70x30', 70x30px
13const unsigned char epd_bitmap_esp32_c3_graffiti_70x30 [] PROGMEM = {
14  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
15  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
16  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x70, 0x18, 0x00, 0x00, 0x03, 0x00, 0x00, 0x07, 0xcf, 0xf7, 
17  0x1f, 0xe0, 0x00, 0x1f, 0x00, 0x00, 0x1f, 0x9f, 0xff, 0x8f, 0xe7, 0xe0, 0x7f, 0x3f, 0xe0, 0x3f, 
18  0x9f, 0xef, 0xe7, 0xf7, 0xf0, 0x7f, 0xbf, 0xe0, 0x3f, 0x3d, 0xef, 0xfa, 0x77, 0xf8, 0x77, 0xbf, 
19  0xe0, 0x38, 0x39, 0xc7, 0xfa, 0x77, 0x78, 0xf7, 0xa3, 0x80, 0x38, 0x79, 0x8e, 0x78, 0xf6, 0x78, 
20  0xe3, 0x87, 0x00, 0x7f, 0x7e, 0x0e, 0x71, 0xe0, 0x70, 0xe3, 0x8f, 0x00, 0x7f, 0x1f, 0x8f, 0xe3, 
21  0xf0, 0xe6, 0xe0, 0x1f, 0xe0, 0x7e, 0x07, 0xef, 0xc3, 0xf9, 0xce, 0xe0, 0x03, 0xe0, 0x70, 0x01, 
22  0xef, 0x88, 0x7b, 0xc1, 0xe1, 0x80, 0xf0, 0xf0, 0x30, 0xfe, 0x38, 0x77, 0x81, 0xe3, 0xb0, 0xf0, 
23  0xf7, 0xfb, 0xee, 0x3d, 0xef, 0x39, 0xe7, 0x71, 0xe0, 0xff, 0x7f, 0xce, 0x1f, 0xcf, 0xf8, 0xff, 
24  0x7f, 0xc0, 0xff, 0x7f, 0x8e, 0x1f, 0xdf, 0xf8, 0xfe, 0x7f, 0x80, 0xfc, 0x3e, 0x0e, 0x1f, 0x3f, 
25  0xf8, 0xfc, 0x7f, 0x00, 0xe0, 0x1c, 0x08, 0x0c, 0x3e, 0x00, 0x78, 0x3c, 0x00, 0x00, 0x00, 0x00, 
26  0x00, 0x00, 0x00, 0x00, 0x38, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
27  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
28  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
29  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
30  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
31};
32*/
33// Correct bits order
34const unsigned char epd_bitmap_esp32_c3_graffiti_70x30 [] PROGMEM = {
35  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
36  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
37  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0E, 0x18, 0x00, 0x00, 0xC0, 0x00, 0x00, 0xE0, 0xF3, 0xEF,
38  0xF8, 0x07, 0x00, 0xF8, 0x00, 0x00, 0xF8, 0xF9, 0xFF, 0xF1, 0xE7, 0x07, 0xFE, 0xFC, 0x07, 0xFC,
39  0xF9, 0xF7, 0xE7, 0xEF, 0x0F, 0xFE, 0xFD, 0x07, 0xFC, 0xBC, 0xF7, 0x5F, 0xEE, 0x1F, 0xEE, 0xFD,
40  0x07, 0x1C, 0x9C, 0xE3, 0x5F, 0xEE, 0x1E, 0xEF, 0xC5, 0x01, 0x1C, 0x9E, 0x71, 0x1E, 0x6F, 0x1E,
41  0xC7, 0xE1, 0x00, 0xFE, 0x7E, 0x70, 0x8E, 0x07, 0x0E, 0xC7, 0xF1, 0x00, 0xFE, 0xF8, 0xF1, 0xC7,
42  0x0F, 0x67, 0x07, 0xF8, 0x07, 0x7E, 0xE0, 0xF7, 0xC3, 0x9F, 0x73, 0x07, 0xC0, 0x07, 0x0E, 0x80,
43  0xF7, 0x11, 0xDE, 0x83, 0x87, 0x01, 0x0F, 0x0F, 0x0C, 0x7F, 0x1C, 0xEE, 0x81, 0xC7, 0x6D, 0x0F,
44  0xEF, 0xDF, 0x77, 0xBC, 0xF7, 0x9C, 0xE7, 0x8E, 0x07, 0xFF, 0xFE, 0x73, 0xF8, 0xF3, 0x1F, 0xFF,
45  0xFE, 0x03, 0xFF, 0xFE, 0x71, 0xF8, 0xFB, 0x1F, 0x7F, 0xFE, 0x01, 0x3F, 0x7C, 0x70, 0xF8, 0xFC,
46  0x1F, 0x3F, 0xFE, 0x00, 0x07, 0x38, 0x10, 0x30, 0x7C, 0x00, 0x1E, 0x3C, 0x00, 0x00, 0x00, 0x00,
47  0x00, 0x00, 0x00, 0x00, 0x1C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
48  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
49  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
50  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
51  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
52};
53
54
55void setup() {
56  Wire.begin(SDA_PIN, SCL_PIN);
57  u8g2.begin();
58}
59
60void loop() {
61  u8g2.clearBuffer();
62  // Centered: (72 - 70) / 2 = 1 pixel offset
63  u8g2.drawXBM(1, 5, 70, 30, epd_bitmap_esp32_c3_graffiti_70x30);
64  u8g2.sendBuffer();
65  delay(500);
66}

#include <Arduino.h>
#include <U8g2lib.h>
#include <Wire.h>

#define SDA_PIN 5
#define SCL_PIN 6

U8G2_SSD1306_72X40_ER_F_HW_I2C u8g2(U8G2_R0, U8X8_PIN_NONE);

extern const unsigned char epd_bitmap_esp32_c3_graffiti_70x30[];
// Incorrect bits order
/*// 'esp32_c3_graffiti_70x30', 70x30px
const unsigned char epd_bitmap_esp32_c3_graffiti_70x30 [] PROGMEM = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x70, 0x18, 0x00, 0x00, 0x03, 0x00, 0x00, 0x07, 0xcf, 0xf7, 
  0x1f, 0xe0, 0x00, 0x1f, 0x00, 0x00, 0x1f, 0x9f, 0xff, 0x8f, 0xe7, 0xe0, 0x7f, 0x3f, 0xe0, 0x3f, 
  0x9f, 0xef, 0xe7, 0xf7, 0xf0, 0x7f, 0xbf, 0xe0, 0x3f, 0x3d, 0xef, 0xfa, 0x77, 0xf8, 0x77, 0xbf, 
  0xe0, 0x38, 0x39, 0xc7, 0xfa, 0x77, 0x78, 0xf7, 0xa3, 0x80, 0x38, 0x79, 0x8e, 0x78, 0xf6, 0x78, 
  0xe3, 0x87, 0x00, 0x7f, 0x7e, 0x0e, 0x71, 0xe0, 0x70, 0xe3, 0x8f, 0x00, 0x7f, 0x1f, 0x8f, 0xe3, 
  0xf0, 0xe6, 0xe0, 0x1f, 0xe0, 0x7e, 0x07, 0xef, 0xc3, 0xf9, 0xce, 0xe0, 0x03, 0xe0, 0x70, 0x01, 
  0xef, 0x88, 0x7b, 0xc1, 0xe1, 0x80, 0xf0, 0xf0, 0x30, 0xfe, 0x38, 0x77, 0x81, 0xe3, 0xb0, 0xf0, 
  0xf7, 0xfb, 0xee, 0x3d, 0xef, 0x39, 0xe7, 0x71, 0xe0, 0xff, 0x7f, 0xce, 0x1f, 0xcf, 0xf8, 0xff, 
  0x7f, 0xc0, 0xff, 0x7f, 0x8e, 0x1f, 0xdf, 0xf8, 0xfe, 0x7f, 0x80, 0xfc, 0x3e, 0x0e, 0x1f, 0x3f, 
  0xf8, 0xfc, 0x7f, 0x00, 0xe0, 0x1c, 0x08, 0x0c, 0x3e, 0x00, 0x78, 0x3c, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x38, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
*/
// Correct bits order
const unsigned char epd_bitmap_esp32_c3_graffiti_70x30 [] PROGMEM = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0E, 0x18, 0x00, 0x00, 0xC0, 0x00, 0x00, 0xE0, 0xF3, 0xEF,
  0xF8, 0x07, 0x00, 0xF8, 0x00, 0x00, 0xF8, 0xF9, 0xFF, 0xF1, 0xE7, 0x07, 0xFE, 0xFC, 0x07, 0xFC,
  0xF9, 0xF7, 0xE7, 0xEF, 0x0F, 0xFE, 0xFD, 0x07, 0xFC, 0xBC, 0xF7, 0x5F, 0xEE, 0x1F, 0xEE, 0xFD,
  0x07, 0x1C, 0x9C, 0xE3, 0x5F, 0xEE, 0x1E, 0xEF, 0xC5, 0x01, 0x1C, 0x9E, 0x71, 0x1E, 0x6F, 0x1E,
  0xC7, 0xE1, 0x00, 0xFE, 0x7E, 0x70, 0x8E, 0x07, 0x0E, 0xC7, 0xF1, 0x00, 0xFE, 0xF8, 0xF1, 0xC7,
  0x0F, 0x67, 0x07, 0xF8, 0x07, 0x7E, 0xE0, 0xF7, 0xC3, 0x9F, 0x73, 0x07, 0xC0, 0x07, 0x0E, 0x80,
  0xF7, 0x11, 0xDE, 0x83, 0x87, 0x01, 0x0F, 0x0F, 0x0C, 0x7F, 0x1C, 0xEE, 0x81, 0xC7, 0x6D, 0x0F,
  0xEF, 0xDF, 0x77, 0xBC, 0xF7, 0x9C, 0xE7, 0x8E, 0x07, 0xFF, 0xFE, 0x73, 0xF8, 0xF3, 0x1F, 0xFF,
  0xFE, 0x03, 0xFF, 0xFE, 0x71, 0xF8, 0xFB, 0x1F, 0x7F, 0xFE, 0x01, 0x3F, 0x7C, 0x70, 0xF8, 0xFC,
  0x1F, 0x3F, 0xFE, 0x00, 0x07, 0x38, 0x10, 0x30, 0x7C, 0x00, 0x1E, 0x3C, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x1C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};


void setup() {
  Wire.begin(SDA_PIN, SCL_PIN);
  u8g2.begin();
}

void loop() {
  u8g2.clearBuffer();
  // Centered: (72 - 70) / 2 = 1 pixel offset
  u8g2.drawXBM(1, 5, 70, 30, epd_bitmap_esp32_c3_graffiti_70x30);
  u8g2.sendBuffer();
  delay(500);
}

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