ESP32 wifi - Arduino IDE
/*
* blue 7 8 9 /
* purple 4 5 6 *
* grey 1 2 3 +
* white c 0 = -
* green yellow orange red (input lines)
*
* 10K pulldown resitors needed on the input lines
*
*/
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
LiquidCrystal_I2C lcd(0x27,16,2);
// Set web server port number to 80
WiFiServer server(80);
// Variable to store the HTTP request
String header;
// Auxiliar variables to store the current output state
String switch1State = "off";
String switch2State = "off";
// Assign output variables to GPIO pins
#define switch1pin 26
#define switch2pin 27
// Current time
unsigned long currentTime = millis();
// Previous time
unsigned long previousTime = 0;
// Define timeout time in milliseconds (example: 2000ms = 2s)
const long timeoutTime = 2000;
int pinout[] = {17,5,18,19};
int pinin[] = {15,2,4,16};
char buttons[4][4] = { {65,78,97,110}, {48,33,48,33}, {45,46,64,95}, {60,62,91,93}};
// A N a n, 0 ! 0 !, - . @ _ , space back clear enter
char sequence[4][4]; // ={{0,0,0,0}, {0,0,0,0}, {0,0,0,0}, {0,0,0,0}};
char limits[4][4] = {{12,12,12,12}, {9,14,9,14}, {0,0,0,0}, {0,0,0,0}};
byte moveCursor = 0;
byte tmpstr_index = 0;
bool first = true;
bool get_input = true;
char tmpstr[16];
char ssid[16];
char pwd[16];
void init_() {
moveCursor = 0;
tmpstr_index = 0;
lcd.setCursor(moveCursor, 1); //second row first position
lcd.print(" ");
for (int i=0; i< 16; i++) {
tmpstr[i] = '\0';
}
reset_limits();
}
void set_parameters() {
if (first) {
lcd.clear();
lcd.setCursor(0, 0);
strcpy(ssid, tmpstr);
lcd.print(ssid);
delay(4000);
lcd.setCursor(0, 0);
lcd.setCursor(0,0);
lcd.print("Enter password ");
first = false;
} else {
get_input = false;
lcd.clear();
lcd.setCursor(0, 0);
strcpy(pwd, tmpstr);
lcd.print(pwd);
delay(4000);
lcd.setCursor(0, 0);
lcd.setCursor(0,0);
lcd.print("WiFi param set ");
}
}
void keypress(int j) {
for (int i=0; i < 4; i++) {
if (digitalRead(pinin[i]) == HIGH) {
if (buttons[j][i] == 60) { // move cursor or space
moveCursor++;
tmpstr_index++;
reset_limits();
} else if (buttons[j][i] == 62) { // backspace
moveCursor--;
if (moveCursor < 0) moveCursor = 0;
tmpstr_index--;
if (tmpstr_index < 0) tmpstr_index = 0;
} else if (buttons[j][i] == 91) { //clear
init_();
} else if (buttons[j][i] == 93) { //enter !!!!
set_parameters();
init_();
} else { // non specific character
lcd.setCursor(moveCursor, 1);
lcd.print((char)(buttons[j][i] + sequence[j][i]));
tmpstr[tmpstr_index] = (char)(buttons[j][i] + sequence[j][i]);
sequence[j][i] = sequence[j][i] + 1;
check_limits();
}
while (digitalRead(pinin[i]) == HIGH) { // wait until end keypress
delay(20);
}
}
}
}
// make the characters loop
void check_limits() {
for (int j=0; j< 4; j++) {
for (int i=0; i< 4; i++) {
if (sequence[j][i] > limits[j][i]) {
sequence[j][i] = 0;
}
}
}
}
void reset_limits() {
for (int j=0; j< 4; j++) {
for (int i=0; i< 4; i++) {
sequence[j][i] = 0;
}
}
}
void setup() {
for (int i=0; i <4; i++) {
pinMode(pinout[i], OUTPUT);
pinMode(pinin[i], INPUT);
}
pinMode(switch1pin, OUTPUT);
pinMode(switch2pin, OUTPUT);
digitalWrite(switch1pin, LOW);
digitalWrite(switch2pin, LOW);
lcd.init();
lcd.backlight();
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Enter SSID");
delay(200);
init_();
while (get_input) { // boolean
for (int i=0; i < 4; i++) {
digitalWrite(pinout[i], HIGH); // multiplexing
keypress(i); // check keypress
digitalWrite(pinout[i], LOW);
delay(20);
}
}
WiFi.begin(ssid, pwd);
lcd.setCursor(0,1);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
lcd.print(".");
}
lcd.setCursor(0,1);
lcd.print(WiFi.localIP());
server.begin();
}
void loop(){
WiFiClient client = server.available(); // Listen for incoming clients
if (client) { // If a new client connects,
currentTime = millis();
previousTime = currentTime;
String currentLine = ""; // make a String to hold incoming data
while (client.connected() && currentTime - previousTime <= timeoutTime) {
currentTime = millis();
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
header += c;
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("Connection: close");
client.println();
// turns the GPIOs on and off
if (header.indexOf("GET /switch1_on") >= 0) {
// Serial.println("GPIO 26 on");
switch1State = "on";
digitalWrite(switch1pin, HIGH);
} else if (header.indexOf("GET /switch1_off") >= 0) {
// Serial.println("GPIO 26 off");
switch1State = "off";
digitalWrite(switch1pin, LOW);
} else if (header.indexOf("GET /switch2_on") >= 0) {
// Serial.println("GPIO 27 on");
switch2State = "on";
digitalWrite(switch2pin, HIGH);
} else if (header.indexOf("GET /switch2_off") >= 0) {
// lcd.println("GPIO 27 off");
switch2State = "off";
digitalWrite(switch2pin, LOW);
}
if (switch1State == "off") {
client.print("Switch1 off ");
lcd.setCursor(0, 0);
lcd.print("Switch1 off ");
} else {
client.print("Switch1 on ");
lcd.setCursor(0, 0);
lcd.print("Switch1 on ");
}
if (switch2State == "off") {
client.println("Switch2 off");
lcd.setCursor(0, 1);
lcd.print("Switch2 off ");
} else {
client.println("Switch2 on");
lcd.setCursor(0, 1);
lcd.print("Switch2 on ");
}
// Display the HTML web page
client.println("<DOCTYPE html>lthtml>
client.println("<head><meta name=\"viewport\" content=\"
width=device-width, initial-scale=1\">
client.println("<link rel=\"icon\" href=\"data:,\">
// CSS to style the on/off buttons
// Feel free to change the background-color
client.println("<style>html { font-family: Helvetica; display: inline-block;
margin: 0px auto; text-align: center;}");
client.println(".button { background-color: #4CAF50;
border: none; color: white; padding: 16px 40px;");
client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
client.println(".button2 {background-color: #555555;}<style>lthead>
// Web Page Heading
client.println("<body><h1>ESP32 Web Server</h1>");
// Display current state, and ON/OFF buttons for GPIO 26
client.println("<p>GPIO 26 - State " + switch1State + "</p>");
// If the switch1State is off, it displays the ON button
if (switch1State=="off") {
client.println("<p><a href=\"/switch1_on\"><button
class=\"button\">ON<button></a></p>
} else {
client.println("<p><a href=\"/switch1_off\"<button
class=\"button button2\">OFF<button></a></p>
}
// Display current state, and ON/OFF buttons for GPIO 27
client.println("<p>GPIO 27 - State " + switch2State + "<p>
// If the switch2State is off, it displays the ON button
if (switch2State=="off") {
client.println("<p>a href=\"/switch2_on\">ltbutton
class=\"button\">ON<button></a></p>");
} else {
client.println("<p><a href=\"/switch2_off\">ltbutton
class=\"button button2\">OFF<button></a></p>");
}
client.println("<body><html>
// 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
}
}
}
// Clear the header variable
header = "";
// Close the connection
client.stop();
}
} // end loop