@@ Line 2: / Line 2: @@
 == Electronic Setup ==
+http://www.uni-weimar.de/medien/wiki/images/Esp-201-cheatsheet.svg
+<!--[http://www.uni-weimar.de/medien/wiki/images/Esp-201-cheatsheet.svg]
+[[http://www.uni-weimar.de/medien/wiki/images/Esp-201-cheatsheet.svg]]-->
+<!--[[file:esp-201-cheatsheet.svg]]-->
 Supply the board with 3.3V on VCC, best run it with a voltage source or regulator that can at least deliver 300mA (many arduino boards have 3.3V regulators on board, but they deliver less than 300mA).
@@ Line 10: / Line 15: @@
 full reference of all AT commands: http://bbs.espressif.com/download/file.php?id=256
+'''first steps:'''
 <source lang="c">
 AT+RST - resets the board:
 ATE1 (verbose)
 ATE0 (non verbose)
+</source>
+'''pre-setup''' to either join a network (station mode) or create a new network acces point (AP)
+<source lang="c">
 AT+CWMODE=1 station mode (join an existing wifi network)
 AT+CWMODE=2 access point mode (create a new wifi network)
 AT+CWMODE=3 access point mode + station mode (create a wifi and join an other one at the same time)
+</source>
+'''select a network around you and join it:'''
+<source lang="c">
+AT+CWLAP list available networks around you that you could join.
 AT+CWJAP="SSID","Your Password" (join a network with the ssid (visible name) and your wifi password)
 </source>
-create a simple server:
+or if you don't want to join an existing network, '''create your own:'''
+<source lang="c">
+AT+CWSAP_DEF="GoAway!!!","myAss!!!",1,0 (creates a wifi with the name GoAway!!! and an optional password: myAss!!! on channel 1.
+means "no encryption", so the password that was set before as myAss!!!" is not used here. (instead 0 setting to 3 uses wpa2_psk, so the password would be used)
+AT+CWDHCP_DEF=1 (turn on DHCP, so others can automatically get an IP address when they connect to your wifi)
+</source>
+either as a station or an AP '''create a simple server''' others can connect to:
 <source lang="c">
 AT+CIPMUX=1 (1: server accepts multiple connection, 0: single connections only)
@@ Line 26: / Line 48: @@
 </source>
-now you can try to connect to your server, eg with your browser.
+now you can try to '''connect to your server''', eg with your browser (not a good idea, but still interesting...)
 we need the ip address for that.
-find the ip of the board:
+find the ip of your esp8266 board:
 <source lang="c">
-AT+CIFSR
+AT+CIFSR (wait until you get the below output)
++CIFSR:APIP,"192.168.4.1"
++CIFSR:APMAC,"1a:fe:34:d2:47:65"
++CIFSR:STAIP,"0.0.0.0"
++CIFSR:STAMAC,"18:fe:34:d2:47:65"
 </source>
+The first line shows the IP address of your board. you can now enter it in a browser:
+http://192.168.4.1:80
 other convenient tests:
 in the shell: telnet, netcat
 in puredata: netsend
+== using the esp8266 with software serial ==
+[[File:Arduino_Pro_Mini_and_ESP-8266.png|600px]]
+to be tried:
+https://github.com/itead/ITEADLIB_Arduino_WeeESP8266
+simple sketch to test the software serial and the esp connected to it, based on softwareSerialExample.ino
+<source lang="c">AT+UART=9600,8,1,0,0</source>
+Sets the ESP8266 to 9600 baud, 8 databits, 1 stop bit no parity bit and no flow control.
+<source lang="c">
+/*
+ * The circuit:
+ * RX is digital pin 10 (connect to TX of the ESP8266)
+ * TX is digital pin 11 (connect to RX of the ESP8266)
+ *
+ * This example code is in the public domain.
+ */
+#include <SoftwareSerial.h>
+SoftwareSerial mySerial(10, 11); // RX, TX
+void setup() {
+  // Open serial communications and wait for port to open:
+  Serial.begin(57600);
+  while (!Serial) {
+    ; // wait for serial port to connect. Needed for native USB port only
+  }
+  Serial.println("Goodnight moon!");
+  // set the data rate for the SoftwareSerial port
+  mySerial.begin(9600);
+  mySerial.println("AT+RST");
+}
+void loop() { // run over and over
+  if (mySerial.available()) {
+    Serial.write(mySerial.read());
+  }
+  if (Serial.available()) {
+    mySerial.write(Serial.read());
+  }
+}
+</source>
+== Use as a standalone Microcontroller Board ==
+Installation Instructions for the Arduino IDE: https://github.com/esp8266/Arduino
+[[File:ESP8266_Standalone.png  | 800px]]
+Enter Flash mode (to upload new firmware):
+and try to upload the example patch below:
+<source lang=c>
+/* ESP8266 as an Arduino
+ *  Wiring:
+ *  GPIO15 (IO15) to GND
+ *  CHIP Enable to VCC (on some modules: CH_PD)
+ *  GPIO0 (IO0) to GND
+*/
+void setup() {
+  Serial.begin(115200);
+}
+void loop() {
+  delay(1000);
+  Serial.println("I'm there!!!!!");
+}
+</source>
+'''pin mapping:'''
+<source lang = c>
+ESP8266 PINS
+============
+Arduino Pin 0 = IO0
+Arduino Pin 1 = Blue LED
+Arduino Pin 2 = IO2
+Arduino Pin 3 = ??
+Arduino Pin 4 = IO4
+Arduino Pin 5 = IO5
+Arduino Pin 6 = ??
+Arduino Pin 7 = ??
+Arduino Pin 8 = ??
+Arduino Pin 12 = IO12
+Arduino Pin 13 = IO13
+Arduino Pin 14 = IO14
+Arduino Pin 15 = IO15
+</source>
+== UDP sending ==
+<source lang=c>
+#include <ESP8266WiFi.h>
+#include <ESP8266mDNS.h>
+#include <WiFiUdp.h>
+WiFiUDP udp;
+const char* ssid     = "yourWifiName";
+const char* password = "yourPassword";
+const char* hostString = "yourHostName";
+void setup() {
+  Serial.begin(57600);
+  delay(100);
+  Serial.println("\r\nsetup()");
+  WiFi.hostname(hostString);
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(250);
+    Serial.print(".");
+  }
+  Serial.println("");
+  Serial.print("Connected to ");
+  Serial.println(ssid);
+  Serial.print("IP address: ");
+  Serial.println(WiFi.localIP());
+ if (!MDNS.begin(hostString)) {
+    Serial.println("Error setting up MDNS responder!");
+ }
+ Serial.println("mDNS responder started");
+}
+void loop() {
+  IPAddress broadcastIp(192, 168, 0, 110);
+  //IPAddress broadcastIp(255, 255, 255, 255);
+  udp.beginPacket(broadcastIp,5555);
+  udp.write("hi");
+  udp.endPacket();
+  delay(500);
+}
+</source>
+== Reverting Firmware to AT Firmware ==
+This is for the esp-201 module, coming with 4mbit (512kB) flash.
+Get the latest Firmware on the espressif bbs home page:
+http://bbs.espressif.com/viewtopic.php?f=46&t=2054
+(this was last checked 2016-05-10 - there might be a more up to date version now)
+either use the flash download tool from the above linked page or for example the very useful esptool:
+https://github.com/themadinventor/esptool
+extract the downloaded files, open a shell and change into the directory "/ESP8266_NONOS_SDK/bin"
+<source lang=bash>
+esptool.py --port /dev/ttyUSB0  write_flash 0x00000 boot_v1.2.bin 0x01000 at/512+512/user1.1024.new.2.bin  0x3e000 blank.bin 0x7e000 blank.bin
+</source>
+or for an original ai thinker firmware:
+download [http://bbs.espressif.com/download/file.php?id=189 esp_iot_sdk_v0.9.5_15_01_23.zip]
+<source lang=bash>
+esptool.py --port /dev/ttyUSB1  write_flash 0x00000 boot_v1.2.bin 0x01000 at/user1.512.new.bin 0x3e000 blank.bin 0x7e000 blank.bin
+</source>

ESP8266 (view source)

Revision as of 14:49, 14 June 2016