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I am new to ESP8266. To ease out the task of programming esp8266, I bought this: ESP-01 ESP8266 Programmer CH340G Chip USB WiFi Wireless UART GPIO0 Adapter.

ESP-01 to USB converter Connected

Configured Arduino Interface to run AT commands in the serial monitor. I flashed ESP8266 with the basic blink LED example. It worked fine for some time and later on gave this error.

warning: espcomm_sync failed

When i tried to flash another program on to ESP8266, I am getting the following error. 

Sketch uses 221,995 bytes (51%) of program storage space. Maximum is 434,160 bytes.
Global variables use 31,568 bytes (38%) of dynamic memory, leaving 50,352 bytes for local variables. Maximum is 81,920 bytes.
error: failed reading byte
warning: espcomm_send_command: cant receive slip payload data
error: failed reading byte
warning: espcomm_send_command: cant receive slip payload data
error: failed reading byte
warning: espcomm_send_command: cant receive slip payload data
error: failed reading byte
warning: espcomm_send_command: cant receive slip payload data
error: failed reading byte
warning: espcomm_send_command: cant receive slip payload data
error: failed reading byte
warning: espcomm_send_command: cant receive slip payload data
error: failed reading byte
warning: espcomm_send_command: cant receive slip payload data
error: failed reading byte
warning: espcomm_send_command: cant receive slip payload data
error: failed reading byte
warning: espcomm_send_command: cant receive slip payload data
warning: espcomm_sync failed
error: espcomm_open failed
error: espcomm_upload_mem failed
error: espcomm_upload_mem failed

I could only find one article regarding this adapter. There he made a custom bridge soldering GPIO 0 to GND for ESP8266 Flashing.

So should i make a removable bridge for the same, to upload a new program. Is there any other way to simplify this task?

Arjun Sunil Kumar
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    Thank you for the post you made! You should auto-answer this post with the post link "Check how to solve it [here]" and mark it as the correct answer. – nemewsys Nov 30 '16 at 22:19
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    I have this exact same module and what really puzzles me is that someone designed and manufactured this product, which simply does not work as advertised. – Roger Dahl Jan 22 '18 at 20:10
  • I know this is an old post, but I just recently tried to use this adapter myself and ran into the same issue. I was able to modify the adapter to use it for flashing the ESP-01.. For all of you still looking for answer, I've written instructable here https://www.instructables.com/id/USB-to-ESP-01-Board-Adapter-Modification/ – AndyJawa Jan 26 '18 at 21:55

2 Answers2

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Finally I made a breadboard connection joining ESP8266's GPIO 0 and GND to Programmer's GND for flashing the chip

For more info

Connections

Additional Reference: Programming ESP8266

Arjun Sunil Kumar
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    Many thanks, you saved me a lot of time! Btw an even simpler way would be fitting a small copper wire plugged in gnd and gpio-0 and then putting the esp01 on top of it – Gabber Jul 09 '17 at 11:58
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Just solder a jumper to the adapter according to this image (bottom side): esp-01 adapter

If you want to use programming mode, just switch to connect GND and GPIO0. Switch back to use GPIO0 as IO pin (you may attach your F-F Dupont cable to the floating pin).

Jan Turoň
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