ESP32 Cyber Deck

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

Adafruit_SSD1306 screen(128, 64, &Wire, -1);
const uint8_t NEXT_PIN = 25, ACTION_PIN = 26;
struct Button {
  uint8_t pin; bool raw = true, stable = true; uint32_t changed = 0;
  bool pressed() {
    bool value = digitalRead(pin);
    if (value != raw) { raw = value; changed = millis(); }
    if (millis() - changed >= 30 && stable != raw) {
      stable = raw; return !stable;
    }
    return false;
  }
};
Button nextButton{NEXT_PIN}, actionButton{ACTION_PIN};
bool displayOK = false, scanning = false, dirty = true;
int page = 0, selected = 0, networks = 0;
uint32_t lastSecond = 0;
String note = "Ready for input";
String input;

void scan() {
  if (scanning) return;
  WiFi.scanDelete(); networks = 0; selected = 0;
  scanning = true;
  WiFi.scanNetworks(true);
  dirty = true;
}
void draw() {
  if (!displayOK) return;
  screen.clearDisplay(); screen.setTextSize(1); screen.setTextColor(SSD1306_WHITE);
  screen.setCursor(0, 0); screen.println("[ CYBERDECK // v1 ]");
  screen.drawLine(0, 10, 127, 10, SSD1306_WHITE); screen.setCursor(0, 14);
  if (page == 0) {
    screen.println("SYSTEM STATUS");
    screen.printf("Uptime: %lus\n", (unsigned long)(millis()/1000));
    screen.printf("Heap: %u KB\n", ESP.getFreeHeap()/1024);
    screen.println("USB serial: 115200");
    screen.println("ACT: scan networks");
  } else if (page == 1) {
    if (scanning) screen.println("Scanning 2.4GHz...");
    else if (networks == 0) screen.println("No networks. ACT scan");
    else {
      screen.printf("NETWORK %d/%d\n", selected+1, networks);
      String ssid = WiFi.SSID(selected); if (!ssid.length()) ssid = "<hidden>";
      screen.println(ssid.substring(0,21));
      screen.printf("%d dBm  CH %d\n", WiFi.RSSI(selected), WiFi.channel(selected));
      screen.println(WiFi.encryptionType(selected)==WIFI_AUTH_OPEN ? "Open network" : "Secured network");
      screen.println("ACT: next / USB:scan");
    }
  } else {
    screen.println("USB MESSAGE"); screen.println(note);
  }
  screen.setCursor(0,56); screen.print("NEXT: change page"); screen.display();
}
void command(String cmd) {
  cmd.trim();
  if (cmd == "scan") { page = 1; scan(); }
  else if (cmd == "status") Serial.printf("Uptime %lus, free heap %u bytes\n", (unsigned long)(millis()/1000), ESP.getFreeHeap());
  else if (cmd.startsWith("note ")) { note = cmd.substring(5,89); page = 2; dirty = true; }
  else Serial.println("Commands: scan | status | note your message | help");
}
void setup() {
  Serial.begin(115200);
  pinMode(NEXT_PIN, INPUT_PULLUP); pinMode(ACTION_PIN, INPUT_PULLUP);
  Wire.begin(21,22);
  displayOK = screen.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  if (!displayOK) Serial.println("OLED failed: check wiring and address 0x3C");
  WiFi.mode(WIFI_STA); WiFi.disconnect();
  Serial.println("CYBERDECK ready. Commands: scan | status | note your message | help");
}
void loop() {
  if (nextButton.pressed()) { page = (page+1)%3; dirty = true; }
  if (actionButton.pressed()) {
    if (page == 0) { page = 1; scan(); }
    else if (page == 1 && !scanning) {
      if (networks > 0) selected = (selected+1)%networks;
      else scan();
    } else if (page == 2) note = "Ready for input";
    dirty = true;
  }
  if (scanning) {
    int count = WiFi.scanComplete();
    if (count != WIFI_SCAN_RUNNING) {
      scanning = false; networks = count > 0 ? count : 0; dirty = true;
      Serial.printf("Scan complete: %d networks\n", networks);
      for (int i=0; i<networks; i++) Serial.printf("%d: %s | %d dBm | CH %d\n", i+1, WiFi.SSID(i).c_str(), WiFi.RSSI(i), WiFi.channel(i));
    }
  }
  for (int n=0; n<64 && Serial.available(); n++) {
    char c = Serial.read();
    if (c == '\n') { command(input); input = ""; }
    else if (c != '\r' && input.length()<100) input += c;
  }
  uint32_t sec = millis()/1000;
  if (sec != lastSecond) { lastSecond = sec; if (page == 0) dirty = true; }
  if (dirty) { draw(); dirty = false; }
  delay(5);
}