BT-EZ 2 Click

How does it work?

BT-EZ 2 Click is based on the CYW20822-P4TAI040, a fully integrated Bluetooth Low Energy wireless module from Infineon that combines the CYW20822 silicon device with onboard crystal oscillator, passive components, embedded flash memory, and an integrated trace antenna. This module is pre-loaded with EZ-Serial firmware, offering a user-friendly command interface for configuration and use, and is fully qualified by the Bluetooth SIG as a cost-optimized Bluetooth 5.0 solution suitable for a wide range of embedded applications. With 1MB of embedded flash memory, the module supports non-volatile storage for self-sufficient operation and over-the-air firmware updates, ensuring flexibility and long-term adaptability.

The integrated 16MHz Arm Cortex-M0 microcontroller enables efficient performance, while the radio supports multiple Bluetooth Low Energy data rates, including 2Mbps, 1Mbps, 500kbps, and 125kbps, giving developers scalability for different use cases. The module delivers a maximum transmit output power of +4dBm and achieves a connection range of up to 250 meters in ideal line-of-sight conditions, while the receiver offers high sensitivity of –101dBm at 125kbps, ensuring robust communication even in challenging environments. These capabilities make BT-EZ 2 Click an excellent solution for wearable devices, smart home systems, IoT nodes, healthcare monitoring, and industrial applications where dependable Bluetooth connectivity, low power consumption, and simple integration are required.

This Click board™ establishes communication between the CYW20822-P4TAI040 module and the host MCU through a UART interface, using standard UART RX and TX pins and hardware flow control via CTS and RTS pins. The default communication speed is set at 115200bps, ensuring efficient data exchange. The board also features a UART SEL jumper that allows the selection of the UART TX signal purpose, enabling it to function either as a standard UART TX signal for data exchange or as a UART TX debug signal, with the mode determined by placing the jumper in the DAT or DBG position. In addition to the interface pins, the board features a reset (RST) pin for hard-resetting the module when necessary, CYS pin for choosing between Command/Data mode (HIGH for command, LOW for data), and SWD pads designed for use with MIKROE's 6-pin Needle Cable, providing an optional flash and debug SWD (Serial Wire Debug) interface functionality.

BT-EZ 2 Click also provides additional user-configurable features and control options, three unpopulated 2-pin headers to enhance flexibility and ease of use in different application scenarios. The NTC header is intended for connecting an external Negative Temperature Coefficient thermistor, which allows developers to implement temperature-dependent control or monitoring, although its specific role depends on the intended application. The MODE header is used for low-power mode control, enabling the module to be configured for reduced energy consumption. The BOOT header provides access to boot control functionality, allowing the user to manage firmware loading or recovery processes as required during development or field updates.

In addition to these headers, the board features user-friendly elements such as a BUTTON switch for triggering custom-defined actions or module commands, as well as two LED indicators, a red LED (LED1) and a yellow LED (LED2), which can be used to provide status feedback, signal communication activity, or serve as general-purpose indicators during prototyping and debugging.

This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. It also comes equipped with a library containing functions and example code that can be used as a reference for further development.

Specifications

Pinout diagram

This table shows how the pinout on BT-EZ 2 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Command/Data Mode Control	CYS	1	AN	PWM	16	NC
Reset / ID SEL	RST	2	RST	INT	15	RTS	UART RTS
UART CTS / ID COMM	CTS	3	CS	RX	14	TX	UART TX
	NC	4	SCK	TX	13	RX	UART RX
	NC	5	MISO	SCL	12	NC
	NC	6	MOSI	SDA	11	NC
Power Supply	3.3V	7	3.3V	5V	10	NC
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

BT-EZ 2 Click electrical specifications

Software Support

BT-EZ 2 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

Example Description

This example demonstrates the use of BT-EZ 2 Click board by processing data from a connected BLE device.

Key Functions

• btez2_cfg_setup This function initializes Click configuration structure to initial values.
• btez2_init This function initializes all necessary pins and peripherals used for this Click board.
• btez2_cmd_action This function sends a specified action command to the Click module.
• btez2_cmd_set This function sends a specified set command to the Click module.
• btez2_read_packet This function reads a response or event packet from the Click module and stores it in ctx->evt_pkt structure.

Application Init

Initializes the driver and logger.

Application Task

Application task is split in few stages:

• BTEZ2_POWER_UP:

  Powers up the device and checks the communication.

• BTEZ2_CONFIG_EXAMPLE:

  Restores factory settings and reads the BT address and name.

• BTEZ2_EXAMPLE:

  Performs a BT terminal example by processing all data from a connected BLE device and sending back an adequate response messages.

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.