1 Introduction
There have been several remote control choice for Nano 33 IoT, like MQTT, AWS IoT things. But the quick choice is using wifi library to make it work.
Make simple http server running on board. Control or read data from Nano 33 IoT would be much easier.
2 The http server
Http server is complex. But simple http server only parse raw strings, detect what in this connection from HTML head as "Content-type:text/html". The body of html would be sent to http client and resolved accordingly. Use brower like Edge or Chrome as quick connect solution.
For large file like voice or image, UDP transmission can work within 256 byte fairly well. I have tried with voice sampling, but the time-splice could not be controlled precisely, the voice is distorted. I have to put away this idea for the moment.
Voice control from mobile phone, then send the control command directly.
3 Control LED
The onboard control use "digitalwrite"
Send commmand with HTTP GET command , that is not enscripted. So, use this choice only in safe network.
4 Running on Board
Here is main part of the code, auxiliary component can be controlled within the
void printGoAround(int merryOn) {
digitalWrite(motorPin, merryOn);
digitalWrite(vocalPin, merryOn);
digitalWrite(blinkingPin, merryOn);
}to control motor and Beeper for musice and led for background light,
void setup() {
Serial.begin(9600); // initialize serial communication
pinMode(13, OUTPUT); // set the LED pin mode
pinMode(motorPin, OUTPUT); // set the motorPin pin mode
pinMode(vocalPin, OUTPUT); // set the vocalPin pin mode
pinMode(blinkingPin, OUTPUT); // set the blinkingPin pin mode
// 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("Click <a href=\"/H\">here</a> turn the LED on pin 13 on<br>");
client.print("Click <a href=\"/L\">here</a> turn the LED on pin 13 off<br>");
// 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 "GET /H" or "GET /L":
if (currentLine.endsWith("GET /H")) {
digitalWrite(13, HIGH); // GET /H turns the LED on
printGoAround(HIGH) ;
}
if (currentLine.endsWith("GET /L")) {
digitalWrite(13, LOW); // GET /L turns the LED off
printGoAround(LOW) ;
}
}
}
// close the connection:
client.stop();
Serial.println("client disconnected");
}
}as in
With gif
5 Summary
This is remote control part, right motor control shall be used for this go around to Play.