SpeakUp 2 Click

How does it work?

SpeakUp 2 Click is based on the FT900Q, a microcontroller from FTDI Chip. The FT900Q is a complete SoC 32-bit RISC microcontroller that runs at a frequency of 100MHz and is accompanied by a 256KB Flash memory. The firmware inside of the FT900Q can be updated over an unpopulated 10-pin Prog connector. The SpeakUp 2 Click receives voice commands over the MM034202-11, an analog MEMS microphone from DB Unlimited. The microphone has omnidirectional directivity, a sensitivity of around -42dB, signal to noise ratio of 59dB, and works in a frequency range from 100 up to 10000Hz. The MCP6022, a rail-to-rail input/output 10MHz Op Amp from Microchip amplifies the microphone signal and passes the data to a 10-bit ADC of the FT900Q.

The FT900Q is responsible for processing received data and comparing stored voice data to received one. Moreover, the FT900Q in Standalone Mode can execute tasks according to the voice command through the HD1 and HD2 headers which contain GPIOs and 3.3V power rails. The GPIOs can have ON, OFF, Toggle, Pulse, and None states, with additional parameters for Pulse. In Click™ Mode, each recorded voice command is given an index number which can be sent to the host MCU over a USB or UART interface. Using onboard push buttons makes it possible to perform some basic configurations without using the software. Push button SW1 is used for recording voice commands that shouldn’t last more than 1 second while pressing the SW2 pushbutton for more than 2 seconds erases all recorded voice commands. Both pressed push buttons will reset the Click board™. Two LEDs, amber and red, provide the board’s visual status.

The SpeakUp Click establishes the connection with the host MCU via one of the selected mikroBUS™ interfaces (UART, SPI, or I2C). UART interface is set as default, while SPI/I2C can be an additional communication method if users want to create their own libraries. Also, the user is provided with other functions such as reset function, interrupt, and PWM from the mikroBUS™ socket.

We also provide a free SpeakUp application based on the Dynamic Time Warping (DTW) algorithm that lets you configure this Click board™ through the software. SpeakUp 2 Click board features a mini USB connector to connect the board to the PC and recognizes it as HID. After a successful connection, the SpeakUp 2 Click board™ will perform ambient noise detection and will calibrate itself, which is a process that will last about 10 seconds. The application for the PC allows you to add voice commands to the SpeakUp 2 Click with a predicted time limit per command. The recorded command will be automatically played so you can make sure it is ok and can be named to avoid future confusion. Application settings have the configuration for acceptance threshold, recording timeout, word length, and more.

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. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.

Specifications

Pinout diagram

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

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	SYN	PWM Signal
Reset	RST	2	RST	INT	15	INT	Interrupt
SPI Chip Select	CS	3	CS	RX	14	TX	UART TX
SPI Clock	SCK	4	SCK	TX	13	RX	UART RX
SPI Data OUT	SDO	5	MISO	SCL	12	SCL	I2C Clock
SPI Data IN	SDI	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	NC
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

SpeakUp 2 Click electrical specifications