Pin Conflict

• Do not make any external connections to D2 (BT) pin during code (firmware) upload. After the installation process is completed, you can make an external connection.
• Do not make any external connections to the D3 pin when using the internal addressable RGB LED.
• If an external connection is provided via the I2C connector, an external connection can be made to the D4 (SDA) and D6 (SCL) pins with the I2C interface with the same pin configuration; However, do not make any external connections to these pins.

Incorrect Pin Naming

The sewable pad pointed out in the picture below is incorrectly named "A2" on the circuit. The name of the pad is “SCL”.

Maximum Voltage in Analog Reading

A0, A1, SCL, A2, A3 and A4 pins with 12-bit resolution can be used as input pins for analog signals. These pins give the maximum value of 4095 at a voltage of approximately 2.85 V.