esp32-wroom-32D impossible to program

Posts: 1
Joined: Tue Feb 04, 2020 9:32 am

esp32-wroom-32D impossible to program

Postby christopheblain » Tue Feb 04, 2020 10:37 am

FTDI adaptor.jpg
FTDI adaptor.jpg (52.33 KiB) Viewed 673 times
Board: ESP32-WROOM-32D
Core Installation/update date: ?
IDE name: Arduino IDE/
Flash Frequency: 40Mhz
Upload Speed: 115200
Flash size: 4Mb

Since 2 days, I try to understand why I can't program my 4 esp32 wroom 32D that I received. I am using Arduino IDE and an FTDI adapter to program. I did several tests, everything works correctly when I program an esp-WROOM-32 but as soon as I want to program the 32D it does not work.
AT the end of the programming I have this: v2.6
Serial port COM7
Connecting........_____....._____....._____....._____....._____....._____.....____An error occurred while uploading the sketch

A fatal error occurred: Failed to connect to ESP32: Invalid head of packet (0xF0)

My PCB and ESP32-WROOM-32D failled:
Image ... oom-32.jpg
My PCB and ESP32-wroom-32 working:
Image ... oom-32.jpg
Image ... daptor.jpg

I press the right buttons to program. I know my ESP-32-wroom-32D is working fine because when I use and other programmer it working fine
my other programmer: ... mage0.jpeg

My sketch is simple:

void setup() {

void loop() {
Serial.println("Going to sleep now");

Many thanks in advance for your help :)
esp32-wroom-32D.jpg (60.5 KiB) Viewed 673 times
esp32-wroom-32.jpg (53.16 KiB) Viewed 673 times

Posts: 6
Joined: Mon Jan 29, 2018 9:19 am

Re: esp32-wroom-32D impossible to program

Postby RobinBlood » Tue Feb 11, 2020 12:13 pm


try searching for "Strapping Pins" in the documentation of the ESP32.
The "other Programmer" already has resistors pulling Up the Enable-pin and IO0 (RST/PROG)
Guess this is what you're missing.

try google-images of "esp32 boot pins" you'll find plenty of wiring examples
or try to program the ESP32 outside your "other programmer", you will find out that you need to connect 6 wires in order to get it working: 3V3, GND, EN, IO0, RXD, TXD

Best Regards

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