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Cassiopeia Ltd - ESP8266+Arduino workshop

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short introduction on how to get the ESP8266 wifi module to work with Arduino over software serial

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Cassiopeia Ltd - ESP8266+Arduino workshop

  1. 1. standard Arduino workshop 2014-2015 ESP8266+Arduino Tom Tobback www.cassiopeia.hk 2015
  2. 2. ESP8266+Arduino workshop 2015 Materials
  3. 3. ESP8266+Arduino workshop 2015 Arduino and wifi Official Arduino wifi shield EUR 69 + VAT Sparkfun CC3000 shield USD 40 Adafruit CC3000 module USD 35
  4. 4. ESP8266+Arduino workshop 2015 ESP8266 wifi module small powerfull cheap => IoT
  5. 5. ESP8266+Arduino workshop 2015 Today’s setup
  6. 6. ESP8266+Arduino workshop 2015 ESP8266 wifi module don’t need microcontroller 2 GPIO pins available on ESP-01 more on ESP-12
  7. 7. ESP8266+Arduino workshop 2015 ESP8266 wifi module direct programming over USB/UART without using Arduino board as micro-controller 1. esptool.py 2. NodeMCU - Lua 3. Arduino IDE! https://github.com/esp8266/Arduino
  8. 8. ESP8266+Arduino workshop 2015 Today’s setup
  9. 9. ESP8266+Arduino workshop 2015 Downloads http://www.dimsumlabs.com/ click on ESP8266 event ● DHT library zipped ● zip file with: esp8266-thingspeak-dht11-test esp8266-thingspeak-dht11-v3 esp8266-dht11-webserver WiFiWebServer-dht11-led
  10. 10. ESP8266+Arduino workshop 2015 ESP8266 pinout Vcc = 3V3 GND UTXD = serial TX URXD = serial RX RST = reset CH_PD = pull up 4.6kOhm GPIO0 = input/output GPIO2 = input/output
  11. 11. ESP8266+Arduino workshop 2015 ESP8266 test Communicate with ESP8266 using Serial converter on our Arduino board ● Vcc = 3V3 ● GND ● URXD = serial RX = pin0 ● UTXD = serial TX = pin1 note: pins seem 5V tolerant
  12. 12. ESP8266+Arduino workshop 2015 ESP8266 test Communicate with ESP8266 using Serial converter on our Arduino board (RX, TX) Upload any sketch not using Serial e.g. blink Connect ESP module Open IDE Serial Monitor Baud rate = 9600 Setting = “Both NL & CR”
  13. 13. ESP8266+Arduino workshop 2015 ESP8266 test AT commands of standard firmware AT+RST reset AT+GMR check firmware version AT+CWMODE=3 set mode to AP+STA AT+CWLAP list wifi networks AT+CWJAP=”ssid”,”password” connect to your wifi AT+CIOBAUD? check baud rate AT+CIOBAUD=9600 set new baud rate https://nurdspace.nl/ESP8266
  14. 14. ESP8266+Arduino workshop 2015 ESP8266 and software serial Arduino board has 1 hardware Serial on pin0 and pin1 but this is also used for uploading and for Serial Monitor Some earlier modules had baud rate 115200 and their firmware did not allow to change it. would only work with hardware Serial, so Serial Monitor over software Serial + USB converter
  15. 15. ESP8266+Arduino workshop 2015 ESP8266 and software serial Better solution: use updated firmware to allow 9600 baud then can use software Serial for ESP8266 and hardware Serial for uploading/monitor as always new modules come set with default 9600 baud no update of firmware necessary software serial on e.g. pin10 and pin11 standard Arduino library
  16. 16. ESP8266+Arduino workshop 2015 ESP8266 setup ESP8266 can act as: WEB SERVER serve web pages over existing wifi network ACCESS POINT create its own wifi network + web server WEB CLIENT communicate with web servers (e.g. thingspeak.com) over existing wifi network
  17. 17. ESP8266+Arduino workshop 2015 ESP8266 web server AT+RST reset AT+CWMODE=1 configure as node AT+CWLAP list access points AT+CWJAP=”ssid”,”pwd” connect to your wifi AT+CIFSR show ip address AT+CIPMUX=1 allow multiple connects AT+CIPSERVER=1,80 start server on port 80 go to browser and type IP address check reply in serial monitor
  18. 18. ESP8266+Arduino workshop 2015 ESP8266 web server go to browser and type IP address check reply in serial monitor +IPD, 0 [means connection id = 0] AT+CIPSEND=0,12 hello world [enter] AT+CIPCLOSE=0 see browser
  19. 19. ESP8266+Arduino workshop 2015 ESP8266 access point AT+RST reset AT+CWMODE=2 configure as access point AT+CWSAP? get your AP details AT+CWSAP=”ssid”,”pwd”,1,3 define your wifi AP change to unique ssid connect to the AP with your phone AT+CIFSR show ip address AT+CIPMUX=1 allow multiple connects AT+CIPSERVER=1,80 start server on port 80 go to browser and type IP address check reply in serial monitor
  20. 20. ESP8266+Arduino workshop 2015 ESP8266 web client AT+RST reset AT+CWMODE=1 configure as node AT+CWJAP=”ssid”,”pwd” connect to your wifi AT+CIPSTART=”TCP”,”184.106.153.149”,80 connect to TCP socket AT+CIPSEND= 4 wait for “>” GET [enter] check reply
  21. 21. ESP8266+Arduino workshop 2015 ESP8266 web client ARDUINO SKETCH send commands over software serial espSerial.println("AT+RST"); construct String to send commands AT+CIPSTART=”TCP”,”184.106.153.149”,80 String cmd; cmd = "AT+CIPSTART="TCP",""; cmd += THINGSPEAK_IP; cmd += "",80"; espSerial.println(cmd);
  22. 22. ESP8266+Arduino workshop 2015 ESP8266 web client ARDUINO SKETCH construct HTTP request to be sent String cmd; cmd = "GET /update?key=xxxxxxxxxxxxxxxxxx&field1="; cmd += temp; cmd += "rn"; send the length of the command espSerial.print("AT+CIPSEND="); espSerial.println(cmd.length()); wait for “>” with espSerial.find(">") espSerial.println(cmd); decode the reply with espSerial.find("SEND OK")
  23. 23. ESP8266+Arduino workshop 2015 thingspeak.com create an account on thingspeak.com create a channel make public enter description field 1: temperature field 2: humidity save get API Write Key test in browser http://api.thingspeak.com/update? key=APIKEY&field1=23.66
  24. 24. ESP8266+Arduino workshop 2015 CONNECTIONS: ● 5V ● GND ● SIGNAL with pull-up resistor ARDUINO LIBRARY https://github.com/adafruit/DHT-sensor-library ARDUINO SKETCH #include <DHT.h> DHT dht(3, DHT11); pinMode(3, INPUT); // DHT11 dht.begin(); float h = dht.readHumidity(); float t = dht.readTemperature(); DHT11 setup
  25. 25. ESP8266+Arduino workshop 2015 ESP8266-thingspeak-dht11-test sketch 22.00degC 59.00% reset ESP8266.. ó#âáT%ÐÇCÁaæ l!ÈÅèchKäFgÚ¡P¥øäæ |cø [Vendor:www.ai-thinker.com Version:0.9.2.4] ready AT+CWMODE=1 no change AT+CWJAP="tobback","xxxx" OK AT+CIPMUX=0 OK AT+CIPSTART="TCP","184.106.153.149",80 OK [or Error] Linked AT+CIPSEND=60 > GET /update?key=RD9SEODFNKIBZ11M&field1=22.00&field2=59.00 wrong syntax ERROR SEND OK +IPD,4:2107 OK
  26. 26. ESP8266+Arduino workshop 2015 ESP8266-thingspeak-dht11-v3 sketch check espSerial feedback to know if commands are working send status over Serial for debugging DHT11 sensor sending data to THINGSPEAK.COM by ESP8266 sample interval (s): 5 22.00degC 57.00% reset ESP8266..module ready..connected to wifi..>send thingspeak.com OK.. receive OK! 22.00degC 59.00% reset ESP8266..module ready..cannot connect to wifi cannot connect to wifi connected to wifi..>send thingspeak.com OK.. receive OK! 22.00degC 58.00% reset ESP8266..module ready..cannot connect to wifi connected to wifi..>send thingspeak.com OK.. receive OK!
  27. 27. ESP8266+Arduino workshop 2015 ESP8266-twitter-dht11-v3 sketch twitter via thingspeak.com: tweet from your Arduino in Thingspeak: add app ThingTweet link to twitter account in sketch: “GET /apps/thingtweet/1/statuses/update/api_key=KEY&status=”;
  28. 28. ESP8266+Arduino workshop 2015 ESP8266 with Arduino IDE Customised IDE using esptool to upload/flash Arduino-style sketches https://github.com/esp8266/Arduino Needs Serial-USB converter (UART)
  29. 29. ESP8266+Arduino workshop 2015 ESP8266 with Arduino IDE Hardware connections: pull GPIO0 to GND (programming mode) connect URXD to TX connect URXD to RX power off/on in IDE: set Tools / Programmer / esptool set Tools / Board / generic ESP8266 set Tools / Port / xxx/usb0 upload BLINK with pin = 0 = GPIO0 release GPIO0 from GND connect GPIO0 to LED
  30. 30. ESP8266+Arduino workshop 2015 ESP8266 with Arduino IDE use high level libraries: #include <ESP8266WiFi.h> ... WiFiServer server(80); WiFi.begin(ssid, password); WiFiClient client = server.available(); ... String req = client.readStringUntil('r'); ... client.print(s);
  31. 31. standard Arduino workshop 2014-2015 Thank you www.cassiopeia.hk Happy tinkering!

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