Have you tried holding down the EN button during sketch upload? I found some but not all ESP's require the EN button to be held down before and until the upload has started. That is till, I added a powered USB hub. Once I added in a powered USB hub the need for sometimes holding down the EN button ...

Hello ! After the yesterday's fiasco , today I've been trying to upload any sketch to a new, out-of-the-box ESP32-EVB. But it doesn't work. I keep getting: A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header What's happening ? Maybe the ESP32-Wroom-32 is burned ou...

My guess is that the ESP32 is dead. How, I've no idea. I had a collection of 7805's that would last a day or two then do some whacked out cht. I found ESP32's blow as quick as fuses. Since then I keep 1 ESP32 and one WROVER-B around as a spare. Every ESP32 burns fast ? Is there any ESP32 that is mo...

Hello ! Earlier today I tried using the ESP Wroom-32 with a P5 SMD 2727 LED Display and the following library: https://github.com/NeoCat/ESP32-P3RGB64x32MatrixPanel I've soldered the wires for that default constructor and tried uploading some codes to the ESP32. Now, the board looked like this: http...

Gpio12 is a bootstrap pin, it can set the (wrong) flash voltage and enable the internal ldo. There are lots of topics about it on the forum, search for them. I don't understand what to look for ! Also, the thing is now, that even with the ESP32 off the board and connected only to a USB cable, it do...

WiFive wrote: ↑

Mon Apr 01, 2019 1:17 pm

You can't press reset with the board plugged in for the same reason you can't boot with it plugged in.

And that reason being ?

Hello ! I'm trying to use a SMD 2727 P5 64x32 LED Display with the ESP32. I've opted for the following library https://github.com/NeoCat/ESP32-P3RGB64x32MatrixPanel I'm also using 2 Logic Level Converters to shift from 5V to 3V3. These are the specs of my power supply: https://i.postimg.cc/prt2vnW7/...

ESP_Sprite wrote: ↑

Mon Apr 01, 2019 10:59 am

Check at least GPIO12 - that's a bootstrap pin and if it's at the wrong level, the upload will fail.

Check how ? With what ? What should I see ? How does the wrong level look like ? Or the right level ?

The GPIO 12 is connected to a Logic Level Converter and then to A pin on the HUB75.

Hello ! I'm trying to use a SMD 2727 P5 64x32 LED Display with the ESP32. I've opted for the following library https://github.com/NeoCat/ESP32-P3RGB64x32MatrixPanel I've soldered the wires for the default constructor. I've passing the wires through 2 Level Logic Converters, from 5V to 3.3V. These ar...

Have you considered using sString.reserve(x) where x is the String buffer size to use, sString.concate( "xxx") to add to the string, sString ="" to clear the string buffer, and a few other functions to work on/with the string buffer? .reserve() assigns an allocated memory space that does not get/ca...