I just got my Nano RP2040 Connect and discovered that the Arduino team has recently completely revamped their online documentation as described in this blog post on May 17: https://blog.arduino.cc/2021/05/17/arduino-docs-has-all-the-info-you-ever-need-about-arduino-boards/ .
And here is the link to the new docs homepage: https://docs.arduino.cc/
The boards are organized by families:
- MKR
- Classic
- Nano
The Portenta has been split off into a separate Arduino Pro Documentation page.
Perfect time to check out how things have changed by looking at the Nano RP2040 Connect docs.
I like the new organization and layout, it's easy to jump right in and get started.
The Tutorials section is really nice in that it showcases a lot of the board features.
Another feature that I also appreciated is the Full Pinout document that has 6 different pinout diagrams that save you from having to decipher variant.h files.
One shows how the multiplexed IO resources are assigned:
And another one that is really helpful, shows how the onboard peripherals are connected:
Really great stuff. Very well done.
So, I'll jump right in and try a tutorial 
. I wanted to try the WiFi, so I tried the Web server tutorial that allows control of the onboard RGB LED from a remote browser window ("Control built-in RGB LED over Wi-Fi with Nano RP2040 Connect"). One thing I discovered is that the RGB LED is connected through the W-102 module which means that you would need to include the WiFiNINA library even if you weren't going to use the WiFi. Another thing I discovered is that my installed WiFiNINA library was out of date and the initial compile failed, but that was an easy fix - just updated to the latest version.
Here's the code:
Nano_RP2040_Connect_WiFi_LED.ino
#include <SPI.h>
#include <WiFiNINA.h>
#include "arduino_secrets.h"
///////please enter your sensitive data in the Secret tab/arduino_secrets.h
//char ssid[] = ""; // your network SSID (name)
//char pass[] = ""; // your network password (use for WPA, or use as key for WEP)
//int keyIndex = 0; // your network key index number (needed only for WEP)
int status = WL_IDLE_STATUS;
WiFiServer server(80);
void setup() {
pinMode(LEDR, OUTPUT);
pinMode(LEDG, OUTPUT);
pinMode(LEDB, OUTPUT);
Serial.begin(9600); // initialize serial communication
while (!Serial);
// check for the WiFi module:
if (WiFi.status() == WL_NO_MODULE) {
Serial.println("Communication with WiFi module failed!");
// don't continue
while (true);
}
String fv = WiFi.firmwareVersion();
if (fv < WIFI_FIRMWARE_LATEST_VERSION) {
Serial.println("Please upgrade the firmware");
}
// attempt to connect to WiFi network:
while (status != WL_CONNECTED) {
Serial.print("Attempting to connect to Network named: ");
Serial.println(ssid); // print the network name (SSID);
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid, pass);
// wait 10 seconds for connection:
delay(10000);
}
server.begin(); // start the web server on port 80
printWifiStatus(); // you're connected now, so print out the status
}
void loop() {
WiFiClient client = server.available(); // listen for incoming clients
if (client) { // if you get a client,
Serial.println("new client"); // print a message out the serial port
String currentLine = ""; // make a String to hold incoming data from the client
while (client.connected()) { // loop while the client's connected
if (client.available()) { // if there's bytes to read from the client,
char c = client.read(); // read a byte, then
Serial.write(c); // print it out the serial monitor
if (c == '\n') { // if the byte is a newline character
// if the current line is blank, you got two newline characters in a row.
// that's the end of the client HTTP request, so send a response:
if (currentLine.length() == 0) {
// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
// and a content-type so the client knows what's coming, then a blank line:
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println();
// the content of the HTTP response follows the header:
client.print("<style>");
client.print(".container {margin: 0 auto; text-align: center; margin-top: 100px;}");
client.print("button {color: white; width: 100px; height: 100px;");
client.print("border-radius: 50%; margin: 20px; border: none; font-size: 20px; outline: none; transition: all 0.2s;}");
client.print(".red{background-color: rgb(196, 39, 39);}");
client.print(".green{background-color: rgb(39, 121, 39);}");
client.print(".blue {background-color: rgb(5, 87, 180);}");
client.print(".off{background-color: grey;}");
client.print("button:hover{cursor: pointer; opacity: 0.7;}");
client.print("</style>");
client.print("<div class='container'>");
client.print("<button class='red' type='submit' onmousedown='location.href=\"/RH\"'>ON</button>");
client.print("<button class='off' type='submit' onmousedown='location.href=\"/RL\"'>OFF</button><br>");
client.print("<button class='green' type='submit' onmousedown='location.href=\"/GH\"'>ON</button>");
client.print("<button class='off' type='submit' onmousedown='location.href=\"/GL\"'>OFF</button><br>");
client.print("<button class='blue' type='submit' onmousedown='location.href=\"/BH\"'>ON</button>");
client.print("<button class='off' type='submit' onmousedown='location.href=\"/BL\"'>OFF</button>");
client.print("</div>");
// The HTTP response ends with another blank line:
client.println();
// break out of the while loop:
break;
} else { // if you got a newline, then clear currentLine:
currentLine = "";
}
} else if (c != '\r') { // if you got anything else but a carriage return character,
currentLine += c; // add it to the end of the currentLine
}
// Check to see if the client request was /X
if (currentLine.endsWith("GET /RH")) {
digitalWrite(LEDR, HIGH);
}
if (currentLine.endsWith("GET /RL")) {
digitalWrite(LEDR, LOW);
}
if (currentLine.endsWith("GET /GH")) {
digitalWrite(LEDG, HIGH);
}
if (currentLine.endsWith("GET /GL")) {
digitalWrite(LEDG, LOW);
}
if (currentLine.endsWith("GET /BH")) {
digitalWrite(LEDB, HIGH);
}
if (currentLine.endsWith("GET /BL")) {
digitalWrite(LEDB, LOW);
}
}
}
// close the connection:
client.stop();
Serial.println("client disconnected");
}
}
void printWifiStatus() {
// print the SSID of the network you're attached to:
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your board's IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
// print where to go in a browser:
Serial.print("To see this page in action, open a browser to http://");
Serial.println(ip);
}
A short video of it working:
And the Serial Monitor output showing the HTTP transactions:
All-in-all a great job with the new documentation...
