Playing with ESP8266

1. Wire up the ESP-01. To prepare it for firmware flashing, GPIO 00 should be connected to ground before you apply power to the ESP.

2. Visit www.nodemcu.com

4. You can download the actual firmware binaries in pre_built. However, it's even easier if you download the flasher itself because it has the firmware included in there! Get the 32bit or 64 bit version depending on your PC's OS.

6. It should find your FTDI port automatically. Click Flash button and wait till you get a checkmark at bottom left.

7. Quit the flasher app.

9. Use some sort of a terminal program to connect to the FTDI port. I'm biased towards LUA Uploader (I wrote it :-))

10. Write a hello world lua progam.

11. Have fun!

This is a placeholder for resources that I'm studying towards using MQTT with the ESP8266.

• MQTT and NodeJS
• Mosquitto
• MQTT lua

How many ESP-01s can we fit on one breadboard?

Actually, this is a demo of ESPs talking to each other. However, I do have quite a few ESPs on the breadboard.

I wanted to control A/C devices, but I didn't want to deal with high voltages. Then I remember X-10 home automation system which according to Wikipedia is 40 years old!? Probably not very practical, but it was fun!

Huge thanks to NodeMCU!
Code and Schematic coming soon...

• Hackaday post about NodeMCU
• NodeMCU quick tutorial
• NodeMCU website
• Coolterm

Arduino Code

Source: ESP8266 documentation

AT // Returns OK
AT+RST // Returns OK
AT+CWMODE=1 // 1=Client, 2=Access Point, 3=Client & AP. Returns either "OK" or "no change"
AT+CIPMUX=0 // 0=Single Channel, 1=Multi Channel. Returns OK
AT+CIPMODE=0 // 0=Received data will be sent to serial port as +IPD,conn, len. 1=plain data stream. Returns OK
AT+CWJAP="WIFI_SSID","WIFI_PASSWORD" // Connect to WIFI_SSID. Returns OK
AT+CIFSR // Returns module's IP Address followed by OK
AT+CIPSTART="TCP","SERVER_IP",PORT_NUM // Connect to SERVER_IP to send data. Returns OK
AT+CIPSEND=LENGTH // Prepare to send string of LENGTH bytes. Returns ">"
Once ">" is received, send the actual data (must end with two sets of CR+LF (counted in LENGTH). Returns OK or ERROR.
AT+CIPCLOSE // Close the connection to SERVER_IP. Returns OK or ERROR