Fiber Opt Click

How does it work?

Fiber Opt Click is based on one IF-D91, a fiber-optic photodiode, and one IF-E97, a fiber-optic LED, both from Industrial Fiber Optics. The IF-D91 is a high-speed photodiode detector housed in a connector-less plastic fiber optic package. Its optical response extends from 400 to 1100nm, making it compatible with a wide range of visible and near-infrared LED and laser diode sources. The detector package features an internal micro-lens and a precision-molded PBT housing to ensure efficient optical coupling with standard 1000μm core 2.2mm jacketed plastic fiber cable. When used with high-speed sources, the IF-D91 is capable of data rates up to 100Mbps. It can also be used for analog video links with bandwidths up to 70MHz.

The IF-E97 is a high-optical-output visible red LED, also housed in a precision-molded PBT package with an internal micro-lens for optimal optical coupling with the same type of plastic fiber cable. Its output spectrum, produced by a GaAlAs die, peaks at 650nm — an optimal transmission window for PMMA plastic optical fiber. The red light has low attenuation in PMMA fibers and helps with installation diagnostics. Combined with its high optical power and linearity, the IF-E97 supports data rates of up to 1Mbps under appropriate driving conditions.

This Click board™ communicates with the host MCU over selectable pins of the mikroBUS™ socket. Transmission can be selected through the TX SEL selection jumper between the UART TX pin or PWM pin of the mikroBUS™ socket, as UART is selected by default. Received data is available on the RX pin of the mikroBUS™ socket.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the PWR SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use 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 Fiber Opt 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	PWM	GPIO TX
	NC	2	RST	INT	15	NC
	NC	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	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Fiber Opt Click electrical specifications

Software Support

Fiber Opt 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 an Fiber Opt Click board by showing the communication between the two Click boards.

Key Functions

• fiberopt_cfg_setup Config Object Initialization function.
• fiberopt_init Initialization function.
• fiberopt_generic_write Generic single write function.
• fiberopt_generic_read Generic single read function.

Application Init

Initalizes device and makes an initial log.

Application Task

Depending on the selected application mode, it reads all the received data or sends the desired text message with the message counter once per second.

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.