Introduction: ESP8266 Firmware Update Using USB-TTL
In this post, we are going to upload firmware to ESP8266 (ESP-01) . The firmware can be updated by both arduino as well as usb-ttl module.
ESP-01 is wifi SoC module and it has two GPIO pins i.e. GPIO0 AND GPIO2
For using ESP8266, we can use either AT commands using any terminal software/ esplorer ide (it supports lua programmming and AT commands) or we can use arduino library.
ESP8266 is a 8-pin SoC having two GPIO pins, it requires 3.3 volt and the current consumed by wifi module can't be attained through arduino. Therefore, if we are using arduino we need external 3.3 volt power supply.
Esp8266 wifi module can act as STA as well as AP or both
Step 1: Things Required:
1. USB-TTL module
3. Male and female berg strip
4. Female to female jumper wires
6. Nodemcu flasher
7. Firmware to be updated
8. Little bit of patience :)
Step 2: Connections
Make connections as given below:
ESP8266 side USB-TTL module
CH_PD and Vcc 3.3 volt provided by the usb-ttl module
GPIO0 GND (while updating the firmware only)
We had connected switch to GPIO0, by pressing the switch it GPIO0 will be grounded
Step 3: Updating the Firmware
In order to update the firmware, make the connections on perfboard. In this circuit, we are using two switches
one for GND and other for GPIO0.
Download Nodemcu flasher from the link below:
Download firmware from the link below:
Make settings as given in the picture. Browse the firmware file (ends with .bin)
Note: GPIO0 should be grounded while updating the firmware.
Vcc and CH_PD should be connected to 3.3 volt only
Step 4: Check Wifi Module
Now check wifi module, using any terminal software e.g. Bray's terminal
Download Bray's terminal:
Open Bray's terminal, rescan for the comport. Select comport and baud rate should be 9600
send AT and it will respond OK
Note: Baud rate depends on the firmware. You can change it by using AT commands