is a common upgraded version that includes improved internal pull-up resistors on GPIO0 and CH_PD, making it easier to use without external hardware modifications. Using the ESP-01 Adapter
Note: GPIO 15 (TXD) must always be LOW during boot. This is why you can't just plug this into a USB-Serial adapter without a button circuit. esp-01 datasheet
: Includes a full TCP/IP protocol stack, allowing for "Serial to Wireless" internet communication. Pinout and Hardware Configuration is a common upgraded version that includes improved
: Average operating current is around 80mA, but it can peak at 200mA during Wi-Fi transmissions. : Includes a full TCP/IP protocol stack, allowing
for flashing the latest AT firmware or custom Arduino code. Troubleshooting common "module not responding" errors.
is ideal for simple IoT tasks where space is at a premium. Instructables guides suggest two primary modes of operation: