IoT simple with the ESP8266 - presented at the July 2015 Austin IoT Hardware Sub-Group
- 1. 1 - 03/09/2015 Austin IoT Hardware Sub- Group July 2015
- 2. About The Austin IoT Sub-Group The IoT Hardware Sub-Group offers a more hands-on approach than its broader based parent, the Austin IoT group. Meetups will feature show-and-tell demonstrations, collaborative discussion, and educational presentations. The focus is on learning how to create IoT devices, for fun or profit. Most of all, we will have fun! with IoT.
- 3. About Tech Shop A Maker’s Dream! Support for Entrepreneurs Membership Tours Meetings
- 4. Tonight’s Agenda ● Introduction ○ Announcements ○ Call for jobs ○ Call for demos - project discussions ● ESP8266 Getting Started
- 5. Announcements ● Got a Job to announce? ● Looking for a Job? ● Any other announcement? ○ of interest to the group
- 6. Demo and Project Discussion ● Show and Tell time! ○ Have something to show? ○ Are you working on a project you can tell us about? ○ How about for next month?
- 7. ESP8266 based ESP-01 Module ● http://esp8266.COM ● WiFi IoT device solution ● Intended as a serial to WiFi bridge ○ UART interfacing ○ AT Command set ○ Full TCP stack ○ Cheap! <$5/each
- 8. Feature Set ● Wi-fi, internal antenna b/g/n ● Wi-fi Direct (P2P), soft AP ● Built in TCP/IP protocol stack ● High power +19.5dBm ● Low power 32-bit CPU - can run apps ● Flash based with built in Boot loader
- 9. AT Command Set ● Talk to the module over Serial ● Connect to Wi-Fi ● AT+CWMODE=3 ● AT+CWJAP=<ssid>,<pwd> ● Command to open socket ● AT+CIPMUX=1 ● AT+CIPSTART=1,”TCP”,”192.168.4.100”,8080 ● Send and receive ● Libraries for Arduino, mbed and others
- 10. ESP-01 Interfacing VCC is 3.3V Blue LED connected to GPIO 1 GPIO 0 low for FLASH RESET active low CH_PD High for active 9600 Default Baud Rate
- 11. ESP8266 SoC ● Espressif CPU ● 32-Bit - 80MHz ● 64K Boot ROM ● 64K Instruction RAM ● 96K Data RAM ● Integrated WEP, TKIP, AES, and WAPI ● SDIO, GPIO(16), UART(2), I2C, ADC(1), SPI, PWM(10 bit) any pin
- 12. Modules
- 13. ESP-12 ● Common Module, good for product use? ● PCB solderable ● FCC Certified? probably ● $8/each at Amazon ● $10 Adafruit breakout board 9 GPIO, 2 UART 1 ADC, I2C, SPI
- 14. Programming ● Node Lua ● NodeMCU ● Arduino ● Xtensa Toolchain
- 15. Node Lua ● Lua Program Language ● Online IDE ● Access to full I/O set ● Cloud API ● Very limited due to available RAM size ○ A few dozen lines of code ● Quick and simple to get some data on the web.
- 16. NodeMCU ● Lua Program Language ● Less limited than NodeLua ● Use any text editor ● Command line utility to load program ● Can compile to bytecode on module ● Good for small quick projects
- 17. Arduino IDE ● C/C++ Program Language ● Install from board manager in IDE (1.6.4) ● Works pretty much exactly like Arduino ○ Faster, much faster ● Base code uses about 46%, medium project added about 1%. Lots of program space. ● Flash process is slow. Hold GPIO0 low and do reset to start it. https://github.com/esp8266/Arduino
- 18. Xtensa Toolchain ● Programming in C/C++ ● Easy to setup on Linux and Mac ● Windows with Cygwin ● Building everything from source ● Raw access and ability to contribute to core
- 19. Product Problems ● FCC ○ Must know this is good to make a Product ○ Claims not easy to validate ○ ESP-12 seems to have it. ● Configuration ○ How will a user setup the Wi-Fi? ○ Need code for AP mode web config ● connect mobile device to ESP AP, captive portal config page ○ Or some common method with an App ■ We could make a standard for this ● common config app in market, user connect to AP the runs app to do configuration.
- 20. My Projects - Raise ● Paired LEDs/Buttons ○ Demo last month ○ LED on each, controlled by button on either ○ Originally tried with NodeMCU ■ Was a struggle to fit it in the code limits ○ Re-coded with the Arduino IDE in C/C++ ■ Very easy compared to Lua stuff ■ Did not touch any limits on code ■ So easy I decided to to a much bigger project
- 21. My Projects - Web Monitor ● Web Monitor ○ ESP-01 with 8X NeoPixels ○ Leds show green/red or flash for status ○ Wi-Fi connection ○ Internet - watches Google and connect time ○ uCHobby Website - downloads index, checks size ○ Sends notice using PushBullet ○ Sends an EMail
- 22. My Projects - Web Monitor ○ NeoPixels ○ Wi-Fi connection ○ HTTP Client ○ PushingBox ● Email and PushBullet ○ MQTT (not done) ● Stats and web interface ○ Serial Menu ○ Configuration (not done) ● can’t share till done. ● Wi-Fi, MQTT, Web site and limits.
- 23. Lessons / tricks ○ Power Issues ■ Decoupling ○ Noise ■ High power Wi-Fi ○ Data Transfer ● less than 1MBPS ○ LED ● Some burn out due to assembly error ○ Breadboard Adapters ○ Tried a Windows / Eclipse build and had trouble ○ Have not tried Arduino to ESP interfacing ○ Use Sublime for code editor.
- 24. Questions?