#ESP8266 FIRMWARE UPDATE USING ARDUINO HOW TO#
#ESP8266 FIRMWARE UPDATE USING ARDUINO INSTALL#
#ESP8266 FIRMWARE UPDATE USING ARDUINO SERIAL#
#ESP8266 FIRMWARE UPDATE USING ARDUINO UPGRADE#

This blank sketch will ensure that no communication interference occurs with the ESP module. Open Arduino IDE and from the top menu, go to File > Examples > 01.Basics > BareMinimum. Also, the TX and RX wires from the Arduino UNO need to be disconnected from the ESP-01 module. Make sure that the Arduino RESET wire is disconnected from Ground. Now, we will prepare the Arduino UNO for the ESP-01 firmware flashing procedure. The table figure shows the full set of connections for firmware flashing but at this stage, do not connect the ESP's Reset and GPIO_0 pins since we will only be reading the firmware information in the next step. The RESET pin on the Arduino UNO is connected to Ground to bypass any code uploaded via the Arduino so that the code is instead sent from the computer to the ESP-01. Connect the 3.3 V pin to the breadboard using a jumper wire, since the 3.3 V will be used not only for the ESP's VCC pin but also the ESP's CH_PD pin to enable the ESP chip. The Arduino UNO is used to provide 3.3 V power directly to the ESP module's VCC pin. To establish a common Ground connection, the Arduino UNO Ground pin is connected to the ESP module Ground pin. Optionally, you could use a logic level converter.Д¬aution: For my setup, i just wired the RX pins directly (not advisable!) and everything worked, but if you decide to forego the logic level conversion, proceed at your own risk! You can build a simple 3.3 V voltage divider using only 2 resistors as shown in the figure. The RX pins connection between the Arduino board and the ESP module should be made through a voltage divider, since the ESP-01 operates on 3.3 V logic level and receiving 5 V logic level from the Arduino UNO could damage the ESP module.

#ESP8266 FIRMWARE UPDATE USING ARDUINO SERIAL#

So, in this case, the Arduino UNO board is used as a serial bridge via its on-board USB to serial converter. The RX and TX connections are not reversed in this case, since the communication is not happening between the Arduino and ESP module but between the ESP and the computer. The connections between the Arduino development board and the ESP module are described in the table. The wire connections with the Arduino UNO and ESP-01 module can be made easily using jumper cables and a breadboard.

Since i already have an Arduino UNO, i used the latter to power the ESP-01 module and establish communication between the ESP-01 and the computer, effectively operating as a serial bridge. 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.Д¬aution: 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.

#ESP8266 FIRMWARE UPDATE USING ARDUINO INSTALL#

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.

#ESP8266 FIRMWARE UPDATE USING ARDUINO HOW TO#

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.

#ESP8266 FIRMWARE UPDATE USING ARDUINO UPGRADE#

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. 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.

Esp8266 firmware update using arduino