Hi,
I am new to Arduino so my apologies if I have done something really silly. I have connected up the ESP8266 module as follows:
VCC----->3.3V
EN------>3.3V
GND---->GND
RX----> TX1
TX------RX1
I have added a resistor between the VCC and 3.3.V. This configuration works perfectly on the Arduino Uno ( I am also using the older ESP8266 - with two LEDs not the newer version with one LED). I need to recreate this setup in an Arduino Mega, I am working on a project with multiple sensors, and I need more I/O pins ( I am using an external 3.3V power supply for the sensors).
The Mega board does not want to connect to the ESP, it does not even see it . Any assistance will be greatly appreciated.
Here is my code (It is not perfect - just a start). This project is part of my computer science Ph.D. looking into Tangible User Interfaces - so apart from C++, I am a total newbie.
#include <WiFiEspClient.h>
#include <WiFiEspServer.h>
#include <SoftwareSerial.h>
#include <SPI.h>
#include <WiFiEspUdp.h>
#define RX 10
#define TX 11
SoftwareSerial esp8266(RX,TX);
char ssid[] = "SmartQuilt"; // your network SSID (name)
char pass[] = "CID3208till"; // your network password (use for WPA, or use as key for WEP)
int status = WL_IDLE_STATUS;
int temperature;
int humidity;
int val=0;
int sensorVal;
int touchPin=9;
int reqCount = 0;
int correct;
String json;
WiFiEspServer server(80);
RingBuffer buf(8);
void setup()
{
Serial.begin(9600);
esp8266.begin(115200);
// Init variables and expose them to REST API
WiFi.init(&esp8266); // initialize ESP module
while (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
delay(1000);
}
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
while (true); // don't continue
}
Serial.print("Attempting to start AP ");
Serial.println(ssid);
// uncomment these two lines if you want to set the IP address of the AP
IPAddress localIp(192, 168, 8, 1);
WiFi.configAP(localIp);
// start access point
status = WiFi.beginAP(ssid, 10, pass, ENC_TYPE_WPA2_PSK);
Serial.println("Access point started");
printWifiStatus();
// start the web server on port 80
server.begin();
Serial.println("Server started");
}
void loop()
{
sensorVal - getSensorData();
int correct = sensorVal++;
WiFiEspClient 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
buf.init(); // initialize the circular buffer
while (client.connected()) { // loop while the client's connected
if (client.available()) { // if there's bytes to read from the client,
Serial.println("available");
char c = client.read(); // read a byte, then
buf.push(c); // push it to the ring buffer
// you got two newline characters in a row
// that's the end of the HTTP request, so send a response
if (buf.endsWith("\r\n")) {
delay(1000);
sendHttpResponse(client);
break;
}
}
}
// give the web browser time to receive the data
delay(10);
// close the connection
client.stop();
Serial.println("Client disconnected");
}
}
int getSensorData(){
val = digitalRead(touchPin);
if(val ==1){
}
return val;
}
void printWifiStatus()
{
// print your WiFi shield's IP address
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print where to go in the browser
Serial.println();
Serial.print("To see this page in action, connect to ");
Serial.print(ssid);
Serial.print(" and open a browser to http://");
Serial.println(ip);
Serial.println();
}
void sendHttpResponse(WiFiEspClient client)
{
client.print(
"HTTP/1.1 200 OK\r\n"
"Content-Type: application/json\r\n"
"Connection: close\r\n" // the connection will be closed after completion of the response
"Refresh: 20\r\n" // refresh the page automatically every 20 sec
"\r\n");
//delay(10000);
client.print("{\n \"LearnShapes\":\n {\"activityID\": \"001\",\n \"acticityName\": \"shapes\",\n \"date\":\"12/12/2021\",\n \"correct\": \"8\",\n \"timeOnTask\":\"5\"\n },\n \"LearnNumbers\":\n {\"activityID\": \"002\",\n \"acticityName\": \"numbers\",\n \"date\":\"12/12/2021\",\n \"correct\": \"5\",\n \"timeOnTask\":\"1.5\"\n },\n \"MarchShapes\":\n {\"activityID\": \"003\",\n \"acticityName\": \"match\",\n \"date\":\"12/12/2021\",\n \"correct\": \"6\",\n \"timeOnTask\":\"3\"\n },\n \"Love\":\n {\"activityID\": \"004\",\n \"acticityName\": \"loves\",\n \"date\":\"12/12/2021\",\n \"correct\": \"8\",\n \"timeOnTask\":\"5\"\n }\n\n}\n\n");
}
I always end up with the output: No WIFI shield present.
Thank you so much for your time.
(with the voltage adaptor on Tx at least)