I'm new to esp8266 and arduino and now working on my iot project. I have problem on flashing nodemcu firmware into esp8266-01 wifi module. I use esptool.py to flash but before flashing i tried to get my device id, so i use this command from command line (i use MacOS).
$sudo esptool.py --port /dev/cu.usbmodem1421 flash_id
This command returns
A fatal error occurred: Failed to connect to Espressif device: Timed out waiting for packet header.
My configuration as follows:
Mac to Arduino using USB cable. I use arduino uno as usb serial ttl (empty sketch).
ESP8266 - Arduino
GND <-> GND (black)
VCC <-> 3.3v (red)
GPIO0 <-> GND (purple)
GPIO2 <-> 3.3v (orange)
CH_PD <-> 3.3v (pink)
TX <-> TX (via logic level shifter) (yellow)
RX <-> RX (green)
The esp module works normally in normal mode (Esp GIPO0 ->3.3v), i can run AT commands and connect to access point. But if change the GPIO0 to GND in flash mode, i get no response in serial terminal and also the esptool.py returns reponse time out.
Is anything wrong with my configuration? sorry i'm new to this, need your help. thank you.