ESP8266 Community Forum

After purchasing the ESP-01 I connected it to my Arduino Uno exactly as recommended by the wiki and was shortly able to connect to my wifi thanks to this excellent video.

I then connected a temperature sensor to the Uno and began trying to send data to thingspeak.com without much success. I've now disconnected the temperature sensor to make sure the ESP-01 was still working period, only to find out that it's not. I've repeatedly disconnected the Uno, gone to serial, typed AT, and I get nothing. When initially powered the ESP-01 still briefly flashes blue and the red light holds steady.

Any ideas on how to trouble shoot this because I am stumped. Beginning to wonder if I've somehow fried it.

Looks like you found yet another of those incomplete guides.
To make sure that the esp boots up from internal memory you should have a pullup resistor on GPIO0.
A pullup on reset is also recommended (if you don't have one the esp will reboot itself randomly)

https://github.com/esp8266/esp8266-wiki ... boot-modes

I would never connect a 3V3 device to 5V unless it designed for that. Use a level shifter or something:
http://elinux.org/RPi_GPIO_Interface_Ci ... el_shifter

Does your esp-1 get really hot when just Vcc and GND are connected? I got one of those, and i'm afraid it is DoA.