Hello,
I am currently working on a project that incorporates I2C between two Arduinos and uses the ESP8266 for Wifi connectivity on one of these Arduinos.
I am having some trouble making them work together, both of these work separately but adding both to one Arduino causes the ESP8266 module to be unable to connect to the Access Point.
I am using MQTT when after connection is established.
#include <PubSubClient.h>
#include "WiFiEsp.h"
#include <SoftwareSerial.h>
#include <Servo.h>
#include <Wire.h>SoftwareSerial espSerial(10, 11); // RX, TX
long int baudRate = 9600;char ssid[] = "RPi1"; // your network SSID (name)
char pass[] = "Raspberry"; // your network password
int status = WL_IDLE_STATUS; // the Wifi radio's status
char server[] = "192.168.1.1"; // IP address of the MQTT server
char topic[] = "MandemOnTheWall"; // Default topic string
char clientId[] = "Mandem1"; // Cliwent id: Must be unique on the brokerWiFiEspClient wifi; // Initialize the Ethernet client object
PubSubClient mqttClient(wifi); // Initialize the MQTT client
int servoPin = 9;
Servo Servo1;
String startOfPayload = "";void setup() {
Serial.begin(9600);
pinMode(servoPin, OUTPUT);
Servo1.attach(servoPin);
Wire.begin(8); // join i2c bus with address #8
Wire.onReceive(MQTTOnReceiveEvent); // register event// Set baud rate of ESP8266 to 9600 regardless of original setting
set_esp8266_baud_rate(baudRate);
espSerial.begin(baudRate);
espSerial.print("AT+UART_CUR=");
espSerial.print(baudRate);
espSerial.print(",8,1,0,0\r\n");
WiFi.init(&espSerial);// check for the presence of the shield
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue
while (true);
}// attempt to connect to WiFi network
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network
status = WiFi.begin(ssid, pass);
}// you're connected now, so print out the data
Serial.println("You're connected to the network");printWifiStatus();
mqttClient.setServer(server, 1883);
mqttClient.setCallback(onReceive);
lock();
}void loop() {
char message[256];
int i;for (i=0; i<256; i++) {
message = 0;
}if (Serial.available()) {
Serial.readBytesUntil("\r",message, 255);
mqttClient.publish(topic,message);
}if (!mqttClient.connected()) {
reconnect();
}mqttClient.loop();
}
void printWifiStatus()
{
// print the SSID of the network you're attached to
Serial.print("SSID: ");
Serial.println(WiFi.SSID());// print your WiFi shield'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");
}void onReceive(byte* payload, unsigned int length) {
if (Wire.available()){
MQTTOnReceiveEvent();
}
else {
Serial.print("Message arrived: ");
for (int i=0;i<length;i++) {
Serial.print((char)payload);
}
}
}void reconnect() {
// Loop until we're reconnected
while (!mqttClient.connected()) {
Serial.print("Attempting MQTT connection...");
// Attempt to connect
if (mqttClient.connect(clientId)) {
Serial.println("connected");
// Once connected, publish an announcement...
mqttClient.publish(topic,"hello world");
// ... and resubscribe
mqttClient.subscribe(topic);
} else {
Serial.print("failed, rc=");
Serial.print(mqttClient.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}void set_esp8266_baud_rate(long int baud_rate){
long int baud_rate_array[] = {1200,2400,4800,9600,19200,38400,57600,74880,115200,230400};
int i, j, pause=10;
String response;Serial.println("Setting ESP8266 baud rate...");
for (j=0; j<5; j++){
for (int i=0; i<10; i++){
espSerial.begin(baud_rate_array);
espSerial.print("AT\r\n");
delay(pause);
if (espSerial.available()) {
response=espSerial.readString();
response.trim();
if (response.endsWith("OK")) {
espSerial.print("AT+UART_CUR=");
espSerial.print(baud_rate);
espSerial.println(",8,1,0,0");
delay(pause);
if (espSerial.available()) {
response=espSerial.readString();
}
espSerial.begin(baudRate);
delay(pause);
espSerial.println("AT");
delay(pause);
if (espSerial.available()) {
response=espSerial.readString();
response.trim();
if (response.endsWith("OK"))
break;
else {
Serial.println("Trying again...");
}
}
else {
Serial.println("Trying again...");
}
}
}
}
if (response.endsWith("OK"))
break;
}
espSerial.begin(baudRate);
delay(pause);
espSerial.println("AT");
delay(pause);
if (espSerial.available()) {
response=espSerial.readString();
response.trim();
if (response.endsWith("OK")) {
Serial.print("\r\nBaud rate is now ");
Serial.println(baudRate);
}
else {
Serial.println("Sorry - could not set baud rate");
Serial.println("Try powering off and on again");
Serial.println("Don't try to use 115200");
}
}
}
void MQTTOnReceiveEvent() {
while (1 < Wire.available()) { // loop through all but the last
char c = Wire.read(); // receive byte as a character
Serial.print(c); // print the character
}
int x = Wire.read(); // receive byte as an integer
Serial.println(x); // print the integer
if (x == 1){
unlock();
}
if (x == 0){
lock();
}
}
void unlock(){
Servo1.write(0);
}
void lock(){
Servo1.write(90);
}
Thank you for your help in advance.
