serial-to-usb adapter – Squix – TechBlog https://blog.squix.org Tue, 13 Dec 2016 20:20:04 +0000 en-US hourly 1 https://wordpress.org/?v=6.5.8 121913304 ESP8266: Using a seeeduino to talk to the ESP8266 module directly https://blog.squix.org/2014/12/esp8266-using-seeeduino-to-talk-to.html https://blog.squix.org/2014/12/esp8266-using-seeeduino-to-talk-to.html#respond Sat, 06 Dec 2014 13:00:00 +0000 http://blog.squix.org/2014/12/06/esp8266-using-seeeduino-to-talk-to/ Read More

]]> I recently received two of these shiny new Wifi modules from China and had to test them out. In many posts around the web they say you should use a serial-to-usb adapter to send some AT commands to the module and set it up with your local access point. My problem was: I didn’t have such an adapter, or so I thought. It turns out you can use some types of Arduino’s for the job just fine. I had a Seeeduino V3.0 laying around and that piece of hardware really has a few features built in that I wasn’t aware of before. This is a short explanation on how to setup the Seeeduino to talk to the ESP8266:

  1. Upload the following sketch to your Seeeduino: 
    void setup()
{
pinMode(0,INPUT);
pinMode(1,INPUT);
}
void loop()
{
}
  2. Open the serial console of the Arduino IDE and set the baudrate to 115200
  3. Now wire the ESP to your arduino:

    ESP8266 Seeeduino
    GND GND
    VCC+CH_PD V3.3
    URXD RX (pin 1)
    UTXD TX (pin 2)
  4. Now send some AT commands for testing (bold is the request, light comments and response): 
    AT
OK
AT+RST         // resets the module
 ets Jan  8 2013,rst cause:4, boot mode:(3,6)

wdt reset
[..]
csum 0xbd
AT+CWLAP       // lists all access points     
+CWLAP:(0,"",0)
+CWLAP:(3,"ap1",-90)
+CWLAP:(0,"ap2",-87)
AT+CWJAP="ap1","mypwd"     // join access point ap1 with password mypwd
OK
AT+CWJAP?     // show connected access point
+CWJAP:"ap1"
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