Serial ESP8266 and Arduino

This page is to Setup and Config Serial ESP8266 and Arduino

Hardware and Software

Hardware

Serial ESP8266 and Arduino

Software

Arduino IDE

Example :

Important Notes

Case 1 : Control By Arduino (Programming only on Arduino) (Example 2)
- Upload standard frimware to ESP-01 (ESP8266的固件将更改为V0.9.2.3版本)
  - [System Ready, Vendor:www.ai-thinker.com]
  - AT+GMR
  - 0018000902
  - Modify ESP-01 SoftAP (SSID and Password for Client connect)
- Case 2 : Send and Receive Data between Arduino and ESP-01
  - Upload Program to Arduino and ESP-01 (Example)
- Case 3 : Only ESP-01 for Software Server

Sanki Notes

- SoftwareSerial on Arduino

Example : Simple Serial Between ESP-01 and Arduino

This example is very simple Serial Communication ESP8266 and Arduino
ESP8266 ESP-01 have to update frimware to AT Command Mode

Example 2 : Web Client ---> ESP-01 Server --> Arduino (By AT Command Call)

Very Good for Web Client ---> ESP-01 Server --> Arduino (By AT Command Call)

Examples - Different SDK Version

Beware Different SDK Version ( This Example Version is : SDK 1.5.3 as at 2016) Check Here
- This Sample Have Client and SoftAP but both IP can go into same Service by Arduino Programming
- Preset on ESP-01
 - Client and SoftAP Mode : AT+CWMODE=3
 - SoftAP : AT+CWSAP="<SSID>","<Password>",11,3
 - (Two ESP-01 have two SSID)
 - SoftAP IP : AT+CIPAP="192.168.167.1"
 - Active DHCP : AT+CWDHCP=2,0
- Set MultiConnect : AT+CIPMUX=1
- Create Server Port : AT+CIPSERVER=1,80
- Set Client :
 - AT+CWJAP="<SSID>","<Password>"
 - WIFI DISCONNECT
 - WIFI CONNECTED
 - WIFI GOT IP
 - Set Client IP : AT+CIPSTA="192.168.0.150"
CHECK
- Check SoftAP
- AT+CIPAP="192.168.167.1"
- OK
- AT+CIPAP?
 - +CIPAP:ip:"192.168.167.1"
 - +CIPAP:gateway:"192.168.167.1"
 - +CIPAP:netmask:"255.255.255.0"
- OK
- AT+CWSAP?
 - +CWSAP:"<SSID>","<Password>",11,3,4,0
- OK
- Check Client
- AT+CWJAP?
 - +CWJAP:"<SSID>","64:71:02:8e:be:42",9,-73
 - OK
- AT+CIPSTA?
 - +CIPSTA:ip:"192.168.0.150"
 - +CIPSTA:gateway:"192.168.0.1"
 - +CIPSTA:netmask:"255.255.255.0"

Last update : 20160505

- - 1. #include <SoftwareSerial.h>
 2. SoftwareSerial ESPserial(2, 3); // RX | TX
 4. void setup()
 5. {
 6. Serial.begin(9600); // communication with the host computer
 7. //while (!Serial) { ; }
 9. // Start the software serial for communication with the ESP8266
 10. ESPserial.begin(9600);
 12. Serial.println("");
 13. Serial.println("Remember to to set Both NL & CR in the serial monitor.");
 14. Serial.println("Ready");
 15. Serial.println("");
 16. }
 18. void loop()
 19. {
 20. // listen for communication from the ESP8266 and then write it to the serial monitor
 21. if ( ESPserial.available() ) { Serial.write( ESPserial.read() ); }
 23. // listen for user input and send it to the ESP8266
 24. if ( Serial.available() ) { ESPserial.write( Serial.read() ); }
 25. }
 26. /*
 27. Arduino Due - ESP 8266 WiFi Module
 28. Act as AP mode, CWMODE=2
 29. Serial (Tx/Rx) communicate to PC via USB
 30. Serial3 (Tx3/Rx3) connect to ESP8266
 31. Arduino Pin 2 --- Tx3 - ESP8266 Rx
 32. Arduino Pin 3 --- Rx3 - ESP8266 Tx
 33. ESP8266 CH_PD Connect to ESP8266 VCC
 34. #include <SoftwareSerial.h>
 35. SoftwareSerial ESP8266(2, 3); // RX | TX
 36. for firmware:
 37. "v0.9.5.2 AT Firmware"
 38. (http://goo.gl/oRdG3s)
 39. AT version:0.21.0.0
 40. SDK version:0.9.5
 41. How to Use
 42. post : http://<Server>/len=0 or len=1
 43. Respore : message after post
 44. Link
 45. +IPD,0,443:GET /len=1 HTTP/1.1
 46. Host: 192.168.4.1
 47. Conn
 48. */
 49. #include <SoftwareSerial.h>
 50. SoftwareSerial ESP8266(2, 3); // RX | TX
 51. //#define ESP8266 Serial3
 52. int LED = 13;
 53. boolean FAIL_8266 = false;
 54. #define BUFFER_SIZE 128
 55. char buffer[BUFFER_SIZE];
 56. void setup() {
 57. pinMode(LED, OUTPUT);
 59. digitalWrite(LED, LOW);
 60. delay(300);
 61. digitalWrite(LED, HIGH);
 62. delay(200);
 63. digitalWrite(LED, LOW);
 64. delay(300);
 65. digitalWrite(LED, HIGH);
 66. delay(200);
 67. digitalWrite(LED, LOW);
 68. delay(300);
 69. digitalWrite(LED, HIGH);
 70. delay(200);
 71. digitalWrite(LED, LOW);
 72. do{
 73. Serial.begin(9600);
 74. ESP8266.begin(9600);
 76. //Wait Serial Monitor to start
 77. while(!Serial);
 78. Serial.println("--- Start ---");
 79. ESP8266.println("AT+RST");
 80. delay(1000);
 81. if(ESP8266.find("OK"))
 82. {
 83. delay(5000);
 84. Serial.println("Module is ready");
 85. ESP8266.println("AT+CWMODE=2");
 86. delay(1000);
 87. clearESP8266SerialBuffer();
 88. //Get and display my IP
 89. sendESP8266Cmdln("AT+CIFSR", 1000);
 91. //Get and display my IP
 92. /* Arduino Due - ESP 8266 WiFi Module Act as AP mode, CWMODE=2 Serial (Tx/Rx) communicate to PC via USB Serial3 (Tx3/Rx3) connect to ESP8266 Arduino Pin 2 --- Tx3 - ESP8266 Rx Arduino Pin 3 --- Rx3 - ESP8266 Tx ESP8266 CH_PD Connect to ESP8266 VCC #include <SoftwareSerial.h> SoftwareSerial ESP8266(2, 3); // RX | TX for firmware: AT version:1.0.0.0 SDK version:1.5.2 How to Use post : http://<Server>/len=0 or len=1 Respore : message after post Link +IPD,0,443:GET /len=1 HTTP/1.1 Host: 192.168.4.1 Conn In This Programming ----- Receive Data from Serial ESP8266 to Arduino Find Postion : Serial.println("+IPD, found"); Read Next char : int connectionId = ESP8266.read()-48; ------------------------------------------------------- Default Setup on ESP8266 ESP-01 SSID : RemoteServer Password : <password> SoftAP IP : 192.168.167.1 SoftAP Gateway : "192.168.167.1" SoftAP netmask : 255.255.255.0 Setup ------ AT+CWSAP="RemoteServer","<password>",11,3 Testing --------- AT+CWSAP? +CWSAP:"RemoteServer","<password>",11,3,4,0 */ #include <SoftwareSerial.h> SoftwareSerial ESP8266(2, 3); // RX | TX //#define ESP8266 Serial3 int LED = 13; boolean FAIL_8266 = false; #define BUFFER_SIZE 128 char buffer[BUFFER_SIZE]; void setup() { pinMode(LED, OUTPUT); digitalWrite(LED, LOW); delay(300); digitalWrite(LED, HIGH); delay(200); digitalWrite(LED, LOW); delay(300); digitalWrite(LED, HIGH); delay(200); digitalWrite(LED, LOW); delay(300); digitalWrite(LED, HIGH); delay(200); digitalWrite(LED, LOW); do{ Serial.begin(115200); ESP8266.begin(115200); //Wait Serial Monitor to start while(!Serial); Serial.println("--- Start ---"); ESP8266.println("AT+RST"); delay(1000); /* Serial.println("--------------- DEBUG ----------------ORGINIAL"); while (ESP8266.available()) Serial.print(char(ESP8266.read())); Serial.println("\n--------------- END DEBUG ----------------"); */ if(ESP8266.find("OK")) { delay(5000); Serial.println("Module is ready"); /* ESP8266.println("AT+CWMODE=2"); delay(1000); clearESP8266SerialBuffer(); //Get and display my IP sendESP8266Cmdln("AT+CIFSR", 1000); //Get and display my IP //sendESP8266Cmdln("AT+CIPSTA=\"192.168.10.1\"", 1000); //ESP8266.println("AT+RST"); */ //Set multi connections sendESP8266Cmdln("AT+CIPMUX=1", 1000); //Setup web server on port 80 sendESP8266Cmdln("AT+CIPSERVER=1,80",1000); Serial.println("Server setup finish"); FAIL_8266 = false; }else{ Serial.println("Module have no response."); delay(500); FAIL_8266 = true; } }while(FAIL_8266); digitalWrite(LED, HIGH); ESP8266.setTimeout(1000); } void loop(){ if(ESP8266.available()) // check if the esp is sending a message { Serial.println("Something received"); delay(1000); //while (ESP8266.available()) // Serial.print(char(ESP8266.read())); //Serial.println(""); /* * --------------- DEBUG ----------------ORGINIAL 1,CLOSED 1,CONNECT +IPD,1,444:GET /len=1 HTTP/1.1 Host: 19 --------------- END DEBUG ---------------- */ /* ----------------------------------------------------------------------- String str = ""; Serial.println("--------------- DEBUG ----------------ORGINIAL"); // // String Control // while (ESP8266.available()) { str += char(ESP8266.read()); } Serial.println(str); // // Serial Control // //while (ESP8266.available()) { // Serial.print(char(ESP8266.read())); //} Serial.println("\n--------------- END DEBUG ----------------"); //------------------------------------------------------------------------------- */ if(ESP8266.find("+IPD,")) { String action; Serial.println("+IPD, found"); int connectionId = ESP8266.read()-48; Serial.println("connectionId: " + String(connectionId)); Serial.println("--------------- DEBUG ----------------A"); char temp = char(ESP8266.read()); while ((temp != '/') && (ESP8266.available())) { Serial.print(temp); temp = char(ESP8266.read()); } Serial.println("\n--------------- END DEBUG ----------------"); boolean isFound = ESP8266.find("len="); Serial.print("is Found : "); Serial.println(isFound); /* Serial.println("--------------- DEBUG ----------------B"); while (ESP8266.available()) Serial.print(char(ESP8266.read())); Serial.println("\n--------------- END DEBUG ----------------"); */ char s = ESP8266.read(); if(s=='0'){ action = "led=0"; digitalWrite(LED, LOW); }else if(s=='1'){ action = "led=1"; digitalWrite(LED, HIGH); }else{ action = "led=?"; } Serial.println(action); sendHTTPResponse(connectionId, action); //Close TCP/UDP //String cmdCIPCLOSE = "AT+CIPCLOSE="; //cmdCIPCLOSE += connectionId; //sendESP8266Cmdln(cmdCIPCLOSE, 1000); } } } void sendHTTPResponse(int id, String content) { String response; /* response = "HTTP/1.1 200 OK\r\n"; response += "Content-Type: text/html; charset=UTF-8\r\n"; response += "Content-Length: "; response += content.length(); response += "\r\n"; response +="Connection: close\r\n\r\n"; */ response = "\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\n"; response += "<body align=center>"; //response += "<img src=\"http://www.imediabank.com/_/rsrc/1462251563655/home/title.png\" />"; //response += "<img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAMAAABEpIrGAAAALVBMVEX///8EBwfBwsLw8PAzNjaCg4NTVVUjJiZDRUUUFxdiZGSho6OSk5Pg4eFydHTCjaf3AAAAZElEQVQ4je2NSw7AIAhEBamKn97/uMXEGBvozkWb9C2Zx4xzWykBhFAeYp9gkLyZE0zIMno9n4g19hmdY39scwqVkOXaxph0ZCXQcqxSpgQpONa59wkRDOL93eAXvimwlbPbwwVAegLS1HGfZAAAAABJRU5ErkJggg==\" />"; response += ""; response += "<a href=\"\len=1\">ON</a>"; response += "<a href=\"\len=0\">OFF</a>"; response += ""; response += content; response += ""; response += "</body></html>\n"; String cmd = "AT+CIPSEND="; cmd += id; cmd += ","; cmd += response.length(); Serial.println("--- AT+CIPSEND ---"); sendESP8266Cmdln(cmd, 1000); Serial.println("--- data ---"); sendESP8266Data(response, 1000); } boolean waitOKfromESP8266(int timeout) { do{ Serial.println("wait OK..."); delay(1000); if(ESP8266.find("OK")) { return true; } }while((timeout--)>0); return false; } //Send command to ESP8266, assume OK, no error check //wait some time and display respond void sendESP8266Cmdln(String cmd, int waitTime) { ESP8266.println(cmd); delay(waitTime); clearESP8266SerialBuffer(); } //Basically same as sendESP8266Cmdln() //But call ESP8266.print() instead of call ESP8266.println() void sendESP8266Data(String data, int waitTime) { ESP8266.print(data); delay(waitTime); clearESP8266SerialBuffer(); } //Clear and display Serial Buffer for ESP8266 void clearESP8266SerialBuffer() { Serial.println("= clearESP8266SerialBuffer() ="); while (ESP8266.available() > 0) { char a = ESP8266.read(); Serial.write(a); //Serial.write(char(ESP8266.read())); } Serial.println(""); Serial.println("==============================\n"); }
 93. //sendESP8266Cmdln("AT+CIPSTA=\"192.168.10.1\"", 1000);
 94. //ESP8266.println("AT+RST");
 96. //Get and display my IP
 97. sendESP8266Cmdln("AT+CIFSR", 1000);
 99. //Set multi connections
 100. sendESP8266Cmdln("AT+CIPMUX=1", 1000);
 101. //Setup web server on port 80
 102. sendESP8266Cmdln("AT+CIPSERVER=1,80",1000);
 104. Serial.println("Server setup finish");
 106. FAIL_8266 = false;
 107. }else{
 108. Serial.println("Module have no response.");
 109. delay(500);
 110. FAIL_8266 = true;
 111. }
 112. }while(FAIL_8266);
 114. digitalWrite(LED, HIGH);
 115. ESP8266.setTimeout(1000);
 116. }
 117. void loop(){
 118. if(ESP8266.available()) // check if the esp is sending a message
 119. {
 120. Serial.println("Something received");
 121. delay(1000);
 122. //while (ESP8266.available())
 123. // Serial.print(char(ESP8266.read()));
 124. //Serial.println("");
 125. /*
 126. Serial.println("--------------- DEBUG ----------------ORGINIAL");
 127. while (ESP8266.available())
 128. Serial.print(char(ESP8266.read()));
 129. Serial.println("\n--------------- END DEBUG ----------------");
 130. */
 132. if(ESP8266.find("+IPD,"))
 133. {
 134. String action;
 135. Serial.println("+IPD, found");
 136. int connectionId = ESP8266.read()-48;
 137. Serial.println("connectionId: " + String(connectionId));
 138. Serial.println("--------------- DEBUG ----------------A");
 139. char temp = char(ESP8266.read());
 140. while ((temp != '/') && (ESP8266.available())) {
 141. Serial.print(temp);
 142. temp = char(ESP8266.read());
 143. }
 144. Serial.println("\n--------------- END DEBUG ----------------");
 146. boolean isFound = ESP8266.find("len=");
 147. Serial.print("is Found : ");
 148. Serial.println(isFound);
 149. /*
 150. Serial.println("--------------- DEBUG ----------------B");
 151. while (ESP8266.available())
 152. Serial.print(char(ESP8266.read()));
 153. Serial.println("\n--------------- END DEBUG ----------------");
 154. */
 156. char s = ESP8266.read();
 158. if(s=='0'){
 159. action = "led=0";
 160. digitalWrite(LED, LOW);
 161. }else if(s=='1'){
 162. action = "led=1";
 163. digitalWrite(LED, HIGH);
 164. }else{
 165. action = "led=?";
 166. }
 168. Serial.println(action);
 169. sendHTTPResponse(connectionId, action);
 171. //Close TCP/UDP
 172. //String cmdCIPCLOSE = "AT+CIPCLOSE=";
 173. //cmdCIPCLOSE += connectionId;
 174. //sendESP8266Cmdln(cmdCIPCLOSE, 1000);
 175. }
 176. }
 178. }
 179. void sendHTTPResponse(int id, String content)
 180. {
 181. String response;
 182. /*
 183. response = "HTTP/1.1 200 OK\r\n";
 184. response += "Content-Type: text/html; charset=UTF-8\r\n";
 185. response += "Content-Length: ";
 186. response += content.length();
 187. response += "\r\n";
 188. response +="Connection: close\r\n\r\n";
 189. */
 191. response = "\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\n";
 192. response += "<body align=center>";
 194. response += "";
 195. response += "<a href=\"http://192.168.4.1/len=1\">ON</a>";
 196. response += "<a href=\"http://192.168.4.1/len=0\">OFF</a>";
 198. response += content;
 199. response += "</body></html>\n";
 200. String cmd = "AT+CIPSEND=";
 201. cmd += id;
 202. cmd += ",";
 203. cmd += response.length();
 205. Serial.println("--- AT+CIPSEND ---");
 206. sendESP8266Cmdln(cmd, 1000);
 208. Serial.println("--- data ---");
 209. sendESP8266Data(response, 1000);
 210. }
 211. boolean waitOKfromESP8266(int timeout)
 212. {
 213. do{
 214. Serial.println("wait OK...");
 215. delay(1000);
 216. if(ESP8266.find("OK"))
 217. {
 218. return true;
 219. }
 220. }while((timeout--)>0);
 221. return false;
 222. }
 223. //Send command to ESP8266, assume OK, no error check
 224. //wait some time and display respond
 225. void sendESP8266Cmdln(String cmd, int waitTime)
 226. {
 227. ESP8266.println(cmd);
 228. delay(waitTime);
 229. clearESP8266SerialBuffer();
 230. }
 231. //Basically same as sendESP8266Cmdln()
 232. //But call ESP8266.print() instead of call ESP8266.println()
 233. void sendESP8266Data(String data, int waitTime)
 234. {
 235. ESP8266.print(data);
 236. delay(waitTime);
 237. clearESP8266SerialBuffer();
 238. }
 239. //Clear and display Serial Buffer for ESP8266
 240. void clearESP8266SerialBuffer()
 241. {
 242. Serial.println("= clearESP8266SerialBuffer() =");
 243. while (ESP8266.available() > 0) {
 244. char a = ESP8266.read();
 245. Serial.write(a);
 246. }
 247. Serial.println("==============================");
 248. }

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