[Question] RobotDYN UNO Wifi

[DJManas]

Hello,

this is more likely a question, than issue.

I have been able to flash ESP on this board with ESP-Link. It works correctly I can configure the ESP, but I want to use it for OTA for Arduino.

I had switched the dip switch to correct position PIN 1,2 ON, others OFF.

I had tried to launch command:
~/.platformio/packages/tool-avrdude/avrdude -DV -pm328p -Pnet:192.168.100.40:23 -cstk500v1 -b115200 -U flash:w:firmware.hex:i -C ~/.platformio/packages/tool-avrdude/avrdude.conf

But it returns:

avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00

I had tried to „hijack“ this thread. But then I had found this blog. Where it is written:
In the ESP-Link home page, the pin assignment is not used. Only the ESP TX0/RX0 is connected to Mega 2560. If you want to use the reset pin, you have to connect the ESP GPIO to Mega 2560 Reset pin manually.

But I have tried almost every ESP gpio pin connect to reset pin on UNO, without any luck.

Can you guide me, what am I doing wrong?

Thanks,
Regards,
Petr Sourek

[gheesung]

Hi Petr,

I am the author of the blog you have mentioned. I do not own an Uno-ESP as mentioned in your question but a Mega-ESP board. I did not manage to get OTA to work on this board. On the other hand, OTA can work on ESP01 and Pro Mini configuration.

Regards
Ghee Sung

[DJManas]

Hello,

thanks for your answer. I just found out this board home and foud out ESP-Link project which is totaly awesome and wanted to combine those 2 things together to get my job done. As far as I can remember statement from RobotDYN, the Mega and Uno should be the same thing (except that Mega is using different serial).

I have a bought a lot of ESP-01 for simpler sensors so i can use one of these for this thing, but lately I had discovered diferent board (ESP-WROOM32) which is far more better for my projects, thanks to 18 channel ADC, I will try to play with this.

Thank you again, when I will have a little time I will try to play with it a little more.
Regards,
Petr Sourek

[gheesung]

BTW, do you know how to connect an external antenna to this board? it has a hole for external antenna but do I need to unsolder any "0" ohm resistor as in other ESP07 board?

[DJManas]

Sorry but no, never added external antenna to ESP boards, have not needed it yet :-(

[DJManas]

I was in communication with RobotDYN, I had layed the question (hope correctly).

I had seen, that there is possibility to connect external antenna for ESP8266. Do I need to unsolder any „0“ ohm resistor as in other ESP-07 boards?

And their answer is here, hope it would be helpful.

About external antenna.
Need to remove this is L2 induction.

[gheesung]

Hi Petr,

Thanks for the useful information. I will try out and let you know if it works.

Regards

[gheesung]

After I have unsoldered L2 and connected an external antenna, the signal strength seems to improve by a few dB and connection is more stable.

Thanks @DJManas for the information.

[DJManas]

You are welcome and thanks for testing.

[JAndrassy]

with Mega+WiFi there is a problem with Mega. The build-in flashing is for 328p.

for reset a jumper from Uno/Mega reset pin to esp8266 io 0 on esp8266 header should work. for the esp8266 header see the bottom of the schema on Robotdyn site