Keyestudio LCD1602 expansion shield integrates 1602 LCD display and six buttons into one piece, which is fully compatible with keyestudio UNO R3 control board. It can work just through stacking expansion board on the keyestudio UNO R3 control board, which is very easy and convenient.
Keyestudio Bluetooth 4.0 expansion shield integrates sensor expansion board with HM - 10 Bluetooth 4.0. It is fully compatible with keyestudio UNO R3 control board, which can work only through stacking the expansion board on the keyestudio UNO R3 control board, easy and convenient.
When we are doing robot experiments, it needs to use multiple PWM ports to drive the servo motor, however, the common used Arduino UNO R3 only has 6 PWM ports, so it is not enough.
Keyestudio PN532 NFC/RFID Controller Shield based on PN532 chip is used for field communication close to 13.56MHz. This shield is equipped with an onboard antenna, so there is no external antenna coil. It is compatible with SPI, IIC, UART interface to communicate. When using it, directly stack it onto Arduino UNO R3 control board.