I've been able to use the raspberry pi and the Arduino 1.8.2 code to load the Adafruit HuZZAH throught the usb connection with my sketch. Next I bought a much lower priced ESP8266 board without the usb connection and I am trying to load it with the usb to serial connection from the pi using a serial TTL cable. I am powering the board off the 3.3v pin from the pi. I can talk to the device which is an ESP-01S using AT commands.
But when I put the ground on GPIO0 and try and upload the sketch from the Arduino I get:
a series of warning:espcomm_send_command: cant receive slip payload data and then
error: espcomm_open failed
On other boards devoted to the ESP8266 they have mentioned how critical the 3.3 voltage is.
so my question is: has anyone successfully flashed an ESP8266 via the serial TTL cable?
and does the pi's 3.3v pin deliver at least 200ma?