So, instead of using a voltage converter and a USB to serial adapter, i decided to opt for a simpler solution. To communicate with the computer, the module additionally needs a USB to serial converter. The ESP-01 module is not 5 V-compliant and requires 3.3 V to power it but also to work properly on the logic level. However, there are many different variants of the ESP-01 module with different flash size and factory firmware version, so your experience might vary. So, i decided it was worth sharing the whole process.Ĭaution: Based on my experience, i would highly advise not to use the command AT+IPR to change your baud rate as it will most likely require you to re-flash your firmware.
No AT commands worked anymore, which prompted me to do more research and after many hours, i finally found a way to restore my ESP-01 and install the latest compatible firmware. I used the following command (based on a quick Google search): AT+IPR=9600 This is what happened when i tried to change the default baud rate from 115200 to 9600. This tutorial also explains how to restore or flash original Espressif firmware if you happen to mess up your ESP firmware, for example, through some wrong AT commands. It is generally a good idea to upgrade your firmware for bug fixes and also depending on the functionalities needed from the ESP module, a more complete set of supported AT commands might be required. You can verify this by uploading a simple sketch like File > Examples > 01.Basics > BareMinimum.The ESP-01 module that i used originally came with older AI Thinker firmware, which limits its capabilities since many useful AT commands are not supported. If you still need to do the reset trick to do uploads after this, the problem may be caused by your code. After this, you should be able to go back to doing normal uploads without needing to press the reset button. The upload should now finish successfully. The port will be different when the bootloader is running so don't assume you already have the correct port selected. Select the port of your board from the Tools > Port menu.The double press causes the bootloader to run indefinitely (until the board is reset, powered off, or an upload is done), which means you don't need to get the timing of the reset just right. You should now see the LED on the board pulsing, which means the bootloader is running. Press the reset button on your board quickly twice.I don't have any experience with the Nano 33 BLE boards, but I know on the SAMD boards if your sketch has blocked the upload process you can recover by putting the board into constant upload mode.
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