Esp8266 wifi shield reprogramming

Development Boards ESP32
1

Good morning,

i bought 2 of these boards and i am trying to upload some code.

I want to use them without Arduino.

https://www.sparkfun.com/products/13287

I am using Arduino IDE 1.8.5 and the usb-ttl converter in pics attached, found it on Amazon:

https://www.amazon.it/gp/product/B01MR7 … UTF8&psc=1

I followed the hookup guide:

https://learn.sparkfun.com/tutorials/es … he-esp8266

I already downloaded and installed the board package and selected “Sparkfun ESP8266 Thing” 115200 baud rate.

Shield switch set on HW.

I connected pins like this:

shield GPIO0 to usb-ttl GND

shield GND to usb-ttl GND

shield 5V to usb-ttl 5V

shield RX to usb-ttl TX

shield TX to usb-ttl RX

The problem is:

"Arduino:1.8.5 (Windows 8.1), Board:“SparkFun ESP8266 Thing, 80 MHz, Flash, Disabled, 512K (no SPIFFS), v2 Lower Memory, Disabled, None, Only Sketch, 115200”

Lo sketch usa 281080 byte (56%) dello spazio disponibile per i programmi. Il massimo è 499696 byte.

Le variabili globali usano 28008 byte (34%) di memoria dinamica, lasciando altri 53912 byte liberi per le variabili locali. Il massimo è 81920 byte.

warning: espcomm_sync failed

error: espcomm_open failed

error: espcomm_upload_mem failed

error: espcomm_upload_mem failed"

These are the steps i performed in order:

-rebooting IDE and circuitry

-disconnecting and reconnecting pins in different orders

-GPIO0 to GND, reboot, keeping it to GND

-GPIO0 to GND, reboot, disconnecting it

-RST and GPIO0 to GND, reboot, keeping them to GND

-RST and GPIO0 to GND, reboot, disconnecting them

-setting shield on SW and retried as up

-using HW TX/RX pins and SW TX/RX pins and retried as up

-changing board with “Generic ESP8266 Wifi module” and retried as up

i am running out of ideas.

Am i doing something wrong? What can i do more?

Thanks,

Nicola

usbserial2.jpg
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usbserial1.jpg
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2

Hello, and thanks for posting your question in out new forums!

We’ve never tried the USB to serial converter you’re using but I’m kind of thinking that might be part of your problem. From looking at the pictures of it on Amazon, I think you need a jumper on the converter that connects VCC to 5V on the converter for the RX/TX lines to work correctly. Give that a try and if it’s still not working, you may need to go with our FTDI basic breakout. That has been tested and will work.

https://www.sparkfun.com/products/9716

3

Thanks for the reply Chris, i just tried as you said and it is not working, always same error messages.

The code upload bar in IDE always swiped at same speed timing, no matter what i changed, like “yes i am uploading…oh it seems there is not serial connection!”.

I am definitely suspecting it is my usb serial converter or something related to DTR pin.

If you give me an input for connections i am going to try with an Arduino Uno as a bootloader.

4

I don’t think an Uno will work to program this shield. I’d suggest using the [FTDI Basic Breakout - 5V recommended in the [hookup guide. We know for sure that will work.](https://learn.sparkfun.com/tutorials/esp8266-wifi-shield-hookup-guide)](https://www.sparkfun.com/products/9716)

5

Ok, i will update the topic soon

6

Ok i tried with Sparkfun FTDI converter:

https://www.sparkfun.com/products/9716

Sketch immediately uploaded, it works! :slight_smile:

7

Good to hear gagliardo!

Happy hacking. :slight_smile: