Hope its ok to post here. Its not exactly a meshtastic project per-say but I think its nifty so thought I would share. TLDR: **Heltek V3 Ebook reader** # History Its an ebook reader from an old heltek v3 that has been running meshtastic for a couple of years now. Its been my debug node for a LONG time playing around with the alpha builds. Lately though I have some better hardware to debug/code with. I saw a project on youtube (cant find the link now?) involving a Heltek being a web server and a ebook reader. But with a eink display. So I spent an afternoon making something similar. The code is my own and its been a couple of decades since ive seriously done C++. # Things you can do with it: 1. Read books! I mean thats why I made it. 2. Upload txt files via a web server! Very simple html to push a book to the device. Limit is currently 500kb so enough for a medium sized book. Technically this could be bigger, but I had some issues with guesstimating the amount of space I had. Enough for H.G. "The Time Machine" and otehr books. But not The Wandering Inn ;) 3. Single click -> next page. 4. Double click -> prev page 5. Tripple click -> IP Address for the web server. Im tempted to make this also turn on the web server instead of having it auto-turn on in the setup. Or making this the area where admin things go. # Pictures ![J6SwY2qZLUHcGkY.jpg](https://media.piefed.social/posts/J6/Sw/J6SwY2qZLUHcGkY.jpg) ![HjIUZRCNz12WTVc.jpg](https://media.piefed.social/posts/Hj/IU/HjIUZRCNz12WTVc.jpg) ![xy047HFEdazQPzu.jpg](https://media.piefed.social/posts/xy/04/xy047HFEdazQPzu.jpg) # Code ```C++ #include #include "HT_SSD1306Wire.h" #include #include #include #include // ===== OLED ===== static SSD1306Wire display(0x3c, 500000, SDA_OLED, SCL_OLED, GEOMETRY_128_64, RST_OLED); #define Vext 25 // adjust if needed // ===== Button ===== #define BUTTON_PIN 0 bool lastButtonState = HIGH; unsigned long lastClickTime = 0; int clickCount = 0; #define CLICK_DELAY 300 // ms for double/triple click // ===== EEPROM ===== #define EEPROM_SIZE 4 #define PAGE_ADDR 0 // ===== WiFi Upload ===== // const char* ssid = "YOUR_WIFI"; // const char* password = "YOUR_PASSWORD"; WebServer server(80); #define MAX_BOOK_SIZE 500000 // 500 KB limit File bookFile; // ===== Book Reading ===== int totalPages = 0; int currentPage = 0; #define PAGE_LINES 6 // lines per page #define LINE_HEIGHT 10 // OLED font height // ===== Functions ===== void VextON() { pinMode(Vext, OUTPUT); digitalWrite(Vext, LOW); } void drawPage(String pageText) { display.clear(); display.setTextAlignment(TEXT_ALIGN_LEFT); display.setFont(ArialMT_Plain_10); display.drawStringMaxWidth(0, 0, 128, pageText); display.setTextAlignment(TEXT_ALIGN_RIGHT); display.drawString(128, 54, String(currentPage + 1) + "/" + String(totalPages)); display.display(); } String getPage(int pageNumber) { if (!SPIFFS.exists("/book.txt")) return ""; // No book File file = SPIFFS.open("/book.txt"); if (!file) return "Error opening book"; String page = ""; int lineCount = 0; int startLine = pageNumber * PAGE_LINES; int currentLine = 0; while (file.available()) { String line = file.readStringUntil('\n'); if (currentLine >= startLine && lineCount < PAGE_LINES) { page += line + "\n"; lineCount++; } currentLine++; if (lineCount >= PAGE_LINES) break; } file.close(); return page; } // ===== Web Server Upload Page ===== String uploadPage = R"rawliteral(

Upload Book (.txt)

)rawliteral"; void handleUpload() { HTTPUpload& upload = server.upload(); if (upload.status == UPLOAD_FILE_START) { bookFile = SPIFFS.open("/book.txt", FILE_WRITE); } else if (upload.status == UPLOAD_FILE_WRITE) { if (upload.totalSize > MAX_BOOK_SIZE) { if (bookFile) bookFile.close(); SPIFFS.remove("/book.txt"); Serial.println("File too large!"); return; } if (bookFile) bookFile.write(upload.buf, upload.currentSize); } else if (upload.status == UPLOAD_FILE_END) { if (bookFile) bookFile.close(); Serial.println("Upload complete"); // calculate total pages File f = SPIFFS.open("/book.txt"); int lineCount = 0; while (f.available()) { f.readStringUntil('\n'); lineCount++; } f.close(); totalPages = (lineCount + PAGE_LINES - 1) / PAGE_LINES; currentPage = 0; EEPROM.write(PAGE_ADDR, currentPage); EEPROM.commit(); } } // ===== Setup ===== void setup() { Serial.begin(115200); VextON(); delay(100); pinMode(BUTTON_PIN, INPUT_PULLUP); display.init(); display.setFont(ArialMT_Plain_10); EEPROM.begin(EEPROM_SIZE); currentPage = EEPROM.read(PAGE_ADDR); if (!SPIFFS.begin(true)) { Serial.println("SPIFFS mount failed"); } WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) delay(500); Serial.println(WiFi.localIP()); server.on("/", HTTP_GET, []() { server.send(200, "text/html", uploadPage); }); server.on("/upload", HTTP_POST, []() { server.send(200, "text/plain", "Upload complete"); }, handleUpload); server.begin(); // calculate total pages if book exists if (SPIFFS.exists("/book.txt")) { File f = SPIFFS.open("/book.txt"); int lineCount = 0; while (f.available()) { f.readStringUntil('\n'); lineCount++; } f.close(); totalPages = (lineCount + PAGE_LINES - 1) / PAGE_LINES; } } // ===== Loop ===== void loop() { server.handleClient(); bool currentButtonState = digitalRead(BUTTON_PIN); // detect press if (lastButtonState == HIGH && currentButtonState == LOW) { clickCount++; lastClickTime = millis(); } lastButtonState = currentButtonState; // process clicks after delay if (clickCount > 0 && (millis() - lastClickTime) > CLICK_DELAY) { if (clickCount == 1) { if (SPIFFS.exists("/book.txt")) { currentPage = (currentPage + 1) % totalPages; } } else if (clickCount == 2) { if (SPIFFS.exists("/book.txt")) { currentPage--; if (currentPage < 0) currentPage = totalPages - 1; } } else if (clickCount >= 3) { // Triple click message display.clear(); display.setTextAlignment(TEXT_ALIGN_CENTER); display.setFont(ArialMT_Plain_10); // display.drawString(64, 30, "Triple click detected!"); display.drawString(64, 40, WiFi.localIP().toString()); display.display(); delay(1000); // show message for 1s } if (SPIFFS.exists("/book.txt")) { EEPROM.write(PAGE_ADDR, currentPage); EEPROM.commit(); } clickCount = 0; } // Display page or IP if no book if (SPIFFS.exists("/book.txt")) { drawPage(getPage(currentPage)); } else { display.clear(); display.setTextAlignment(TEXT_ALIGN_CENTER); display.setFont(ArialMT_Plain_10); display.drawString(64, 20, "No book uploaded"); display.drawString(64, 40, WiFi.localIP().toString()); display.display(); } delay(50); } ```

whoBIRD: an app to help define bird calls

whoBIRD: an app to help define bird calls

Resources/Recommendations for learning calls?

Resources/Recommendations for learning calls?