Timer Relay click

How does it work?

Timer Relay Click is based on the NE555, a precision timer from Diodes Incorporated. It works so that when the trigger is in a LOW logic state, it will start a delay regarding the threshold and then activate the relay. The TPL0501, a 256-tap single-channel digital potentiometer from Texas Instruments, determines the threshold. By setting a desired value on this digital potentiometer, you are setting a threshold on the NE555 for the delay. When you hit the onboard trigger button, you activate the relay regarding the delay you set by the digital potentiometer.

Timer Relay Click uses a 3-wire SPI serial interface of the TPL0501 to allow the host MCU to set the threshold. Besides the trigger button, you can trigger the NE555 over the TRG pin of the mikroBUS™ socket. When the timer hits the threshold and after delay activates the relay, it will also turn the TIMER LED On. The relay itself can withstand up to 10A and 220VAC/28VDC.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC 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 Timer Relay 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	NC
Reset / ID SEL	RST	2	RST	INT	15	TRG	Timer Trigger
SPI Select / ID COMM	CS	3	CS	RX	14	NC
SPI Clock	SCK	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	NC
SPI Data IN	SDI	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

Timer Relay Click electrical specifications

Software Support

We provide a library for the Timer Relay Click as well as a demo application (example), developed using MIKROE compilers. The demo can run on all the main MIKROE development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Timer Relay Click driver.

Key functions

• timerrelay_set_wiper_pos Timer Relay set wiper position function.

• timerrelay_activate_reset Timer Relay reset timer function.

• timerrelay_activate_trigger Timer Relay activate trigger function.

Example Description

This example demonstrates the use of the Timer Relay Click board™ by setting the relay timer to 2 seconds ON time, then holding it OFF for 2 more seconds.

void application_task ( void ) 
 { 
     timerrelay_activate_trigger( &timerrelay ); 
     log_printf( &logger, " Trigger activated. rn" ); 
     Delay_ms( 4000 ); 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.TimerRelay

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MIKROE compilers.

mikroSDK

This Click board™ is supported with mikroSDK - MIKROE Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.