ESP8266 Community Forum

- Mon Aug 03, 2015 8:01 am #24888 @burkmurray -- Oooh thanks for that. Based on my picture of the ESP8266-12 found here:

http://neilkolban.com/tech/wiring-up-esp8266s/

What IS the correct order for GPIO5 and GPIO4? I'll test with LEDs as well.

Neil

Free ESP8266 book available for download here.

- Mon Aug 03, 2015 8:56 am #24899 Also, make sure you have PullUps on both SDA/SCK lines, somthing like 4K7.

- Mon Aug 03, 2015 4:13 pm #24931

@burkmurray -- Oooh thanks for that. Based on my picture of the ESP8266-12 found here:

http://neilkolban.com/tech/wiring-up-esp8266s/

What IS the correct order for GPIO5 and GPIO4? I'll test with LEDs as well.

Neil

If you take module with antennae pointed up then GPIO5 is above GPIO4 (thumb-finger method ).

--
Mozz

- Mon Aug 03, 2015 5:25 pm #24936 Oh ! I've almost forget : If you have old ArduinoIDE, there was a bug in TwoWire::begin() where it was still defaulting to GPIO2/GPIO0. It have been fix few weeks ago. To make sure your version has the fix, look Wire.cpp, it should look like this (I've added the comments) :

Code: Select allvoid TwoWire::begin(int sda, int scl){
  default_sda_pin = sda; // this line was missing in older version.
  default_scl_pin = scl; // this line was missing in older version.
  twi_init(sda, scl);
  flush();
}