ESP8266 Community Forum

- Tue Nov 03, 2015 3:43 am #32910 Hello,

I've been playing with two different versions of the ESP and just bought an ESP-07.
However I can't seem to have it simply work.

I hooked up VCC, GND, TX and RX but I don't see any activity on these.
Red LED is shining and blue one also (constantly) but not so strong.

I know it's not too much info but I don't think I have more. I just wanted to first play with AT commands.

Thank you!

- Tue Nov 03, 2015 4:58 am #32917 Hi, do you GPIO 15 low at boot? If not it will go into 'boot from SD card' mode and the blue Tx led flashes because it is trying to comunicate with the SD card.
Boards like the ESP8266-01 don't berakout GPIO 15 so it is pulled low on the board.

GPIO 0 = High
GPIO 2 = High
GPIO 15 = Low

- Tue Nov 03, 2015 5:23 am #32920 Excellent news! I thought it was dead already.

What SD card is it trying to read since there's no slot to insert an SD card ?

Thanks a bunch!

Edit:
buZz on IRC mentioned: http://www.electrodragon.com/w/Category ... asic_Usage
It does provide a log of good info!

- Tue Nov 03, 2015 3:55 pm #32958 Definitely working this way! Thanks Barnabybear.

I also set CH_PD to High.