The original Arduino Nano was released in 2008. Today, there are also very affordable Arduino Nano Clones for less than €2. Even though more modern MCUs like ESP32 offer vastly superior performance, Arduino Nano can still be an excellent choice for its low power consumption since many projects do not require high computational performance.
Overview
Arduino Nano is a good development board for simple automation tasks, especially when low power consumption is important. For example, an Arduino Nano board draws around 20-50mA when in contrast a ESP32 can draw up to 240mA.
There are a few caveats though that you should consider before looking deeper into using an Arduino Nano:
- No Radio:
Arduino Nano does not come with any radio capabilities (WiFi, Bluetooth). - Small Memory:
There are just 30 KB usable flash memory, compared to 4-16 MB flash memory in ESP32. If your firmware gets more complex, you may run into memory issues. - Voltage:
Arduino Nano runs on 5V whereas ESP32 runs on 3.3V. This may be important in respect to the peripherals you plan to connect to the board.
Arduino Nano Clones
Today, Arduino Nano Clones are commonplace and very affordable. Clones typically use the “old” bootloader, so this is the platformio.ini for platformio that you most likely need to use:
[env:nano_old]
platform = atmelavr
board = nanoatmega328
framework = arduino
upload_speed = 57600
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(content created Dec 16, 2025)