Arduino Uno R4 Wi-Fi OS

1extern bool isNtpReady();
2
3void printAbout() {
4  Serial.println(F("\n─────────────────────────────"));
5  Serial.println(F(" Arduino Uno R4 Wi-Fi OS v1.0"));
6  Serial.println(F(" Developed by Tadeo A. Gonzalez"));
7  Serial.println(F(" Shell prompt: root@uno-r4:/$"));
8  Serial.print  (F(" Wi-Fi enabled / "));
9  Serial.println(isNtpReady() ? "NTP Synced" : "NTP Not Synced");
10  Serial.println(F(" RTC, pixel, and command modules loaded"));
11  Serial.println(F("─────────────────────────────"));
12}

1#include <WiFiUdp.h>
2#include <NTPClient.h>
3
4WiFiUDP ntpUDP;
5NTPClient timeClient(ntpUDP, "pool.ntp.org", -4 * 3600, 60000);  // EDT offset
6
7// Call once after Wi-Fi connects
8void initClock() {
9  timeClient.begin();
10  Serial.print("Connecting to NTP");
11  for (int i = 0; i < 10; i++) {
12    if (timeClient.forceUpdate()) {
13      Serial.println(" ✓ NTP synced");
14      return;
15    }
16    Serial.print(".");
17    delay(500);
18  }
19  Serial.println(" ✗ NTP failed");
20}
21
22// Call from shell
23void printTime() {
24  timeClient.update();
25  Serial.println(timeClient.getFormattedTime());
26}
27
28// Public status check
29bool isNtpReady() {
30  retu

1// Define The Bootloader (GRUB/ArduinoOS)
2
3const char* VERSION = "1.0";
4
5void grug_arduinoos() {
6  Serial.println(F("Using Drive: /dev/flash0"));
7  Serial.println(F("Loading..............................."));
8  Serial.println(F("disk: flash0"));
9
10  Serial.print(F("OS: Arduino UNO R4 Wi-Fi OS "));
11  Serial.print(F("KERNEL: ArduinoOS "));
12  Serial.print(F("VERSION: "));
13  Serial.print(VERSION);
14  Serial.print(F(" ARDUINOOS VERSION: UNO R4 Wi-Fi "));
15  Serial.println(VERSION);
16
17  Serial.print(F("GRUB> "));
18  delay(4260);
19  Serial.println(F("Booting from arduinounor4wifips.ino..."));
20}

1void ls() {
2  Serial.println(F("arudinounor4wifios.ino (kernel)"));
3  Serial.println(F("about.ino"));
4  Serial.println(F("clock.ino"));
5  Serial.println(F("grub_arudinoos.ino"));
6  Serial.println(F("ls.ino"));
7  Serial.println(F("uname.ino"));
8}

1#include <WiFiS3.h>          // Arduino Uno R4 Wi-Fi driver
2#include <WiFiUdp.h>
3#include <NTPClient.h>
4#include <Modulino.h>
5
6// Wi-Fi credentials
7const char* SSID = "Gonzalez";          // Your network name
8const char* PASS = "MiPa$$wordS3cr3to"; // Your network password
9
10// Shell utilities (defined in other tabs)
11extern void initClock();
12extern void printTime();
13extern void printAbout();
14extern void printUname();
15extern void grug_arduinoos();
16extern void ls();
17
18
19// Global modules
20ModulinoPixels pixels;
21
22void setup() {
23  Modulino.begin();
24  Serial.begin(9600);
25  while (!Serial); // wait for USB serial connection
26  // Start Bootloader (GRUB/ArudinoOS)
27  grug_arduinoos();
28
29  // Connect to Wi-Fi
30  Serial.print("Connecting to Wi-Fi");
31  WiFi.begin(SSID, PASS);
32  while (WiFi.status() != WL_CONNECTED) {
33    delay(500);
34    Serial.print('.');
35  }
36  Serial.println(" OK");
37
38  // Sync time via NTP
39  initClock();
40
41  // Boot banner
42  Serial.println();
43  Serial.println("Arduino Uno R4 Wi-Fi OS v1.0");
44  Serial.println("Type 'help' for commands");
45  Serial.print("root@uno-r4-wifi:/$ ");
46
47  // Initialize hardware modules
48  pixels.begin();
49}
50
51void loop() {
52  if (!Serial.available()) return;
53
54  String cmd = Serial.readStringUntil('\n');
55  cmd.trim();
56
57  if (cmd == "help") {
58    Serial.println("Commands: pixels on, pixels off, clock, about, reboot, uname, ls");
59  }
60  else if (cmd == "pixels on") {
61    for (int i = 0; i < 8; i++) {
62      pixels.set(i, 255, 0, 0, 10); // Red, brightness 10
63    }
64    pixels.show();
65    Serial.println("Pixels on");
66  }
67  else if (cmd == "pixels off") {
68    pixels.clear();
69    pixels.show();
70    Serial.println("Pixels off");
71  }
72  else if (cmd == "clock") {
73    printTime();
74  }
75  else if (cmd == "about") {
76    printAbout();
77  }
78  else if (cmd == "reboot") {
79    Serial.println("Rebooting...");
80    NVIC_SystemReset();
81    while (1);
82  }
83  else if (cmd == "uname") {
84    printUname();
85  }
86  else if (cmd == "ls") {
87    ls();
88  }
89  else {
90    Serial.println("Unknown command. Type 'help'");
91  }
92
93  Serial.print("root@uno-r4-wifi:/$ ");
94}

1void printUname() {
2  Serial.println(F("\nKernel Name           : GNU/ArduinoOS"));
3  Serial.println(F("Node Name               : uno-r4-wifi"));
4  Serial.println(F("Release                 : 1.0.0"));
5  Serial.println(F("Architecture            : Renesas-RA4M1"));
6  Serial.println(F("Wi-Fi Driver            : WiFiS3"));
7  Serial.println(F("Build/Compile/Test Date : Jun 30 2025 19:24:22"))
8  Serial.println(F("Install Date            : " __DATE__ " " __TIME__));
9  Serial.println(F("Arduino Sketch          : arduinounir4wifios.ino"));
10}