RELAY Click

How does it work?

RELAY Click is based on two G6D1AASIDC5s, slim miniature relays from OMRON. Despite its size, the G6D-1A-ASI DC5 relay can withstand up to 5A and 220V AC/30V DC. It can endure up to 300,000 operations, with 30V DC and 2A. This relay has a single pole only - when the coil is energized, it will attract the internal switching elements and close the circuit, similarly to a switch. These relays are designed so relatively low currents and voltages can easily activate their coils. For the G6D-1A-ASI DC5 relay operated at 5V, the coil current is 40mA. This makes them a perfect choice for activating them by an MCU.

RELAY Click uses GPIO pins RL1 and RL2 to be controlled by the host MCU. Since RELAY Click uses an NPN RET and resistors, the host MCU is safe from the current spikes driving the relay's coils. In addition, there is an LED for every relay, each of a different color, representing the relays' status.

This Click board™ can be operated only with a 5V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it 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 of Relay click corresponds to the pinout of the mikroBUS™ socket (the latter shown in the two middle columns).
 

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	RL1	Relay 1 Control
	NC	2	RST	INT	15	NC
Relay 2 Control	RL2	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	NC
	NC	6	MOSI	SDA	11	NC
	NC	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Relay click maximum ratings

Software support 

We provide a library for Relay click on our LibStock page, as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Library Description

The library offers an option to control the state of relays.

Key functions:

void relay_relay2Control( uint8_t pinState ) - Controls the Relay 2 pin.

void relay_relay1Control( uint8_t pinState ) - Controls the Relay 1 pin.

Examples Description:

The application is composed of three sections:

• System Initialization - Sets pin directions.
• Application Initialization - Initializes driver.
• Application Task - Turns relays on and off.

void applicationTask()
{
relay_relay2Control ( 1 );
relay_relay1Control( 1 );
mikrobus_logWrite("Relays turned on", _LOG_LINE);

Delay_ms(1000);

relay_relay2Control ( 0 );
relay_relay1Control( 0 );
mikrobus_logWrite("Relays turned off", _LOG_LINE);

Delay_ms(1000);
}

The full application code, and ready to use projects can be found on our LibStock page.

Other mikroE Libraries used in the example:

• UART

Additional notes and information

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. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.

mikroSDK

This click board is supported with mikroSDK - MikroElektronika 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.

Relay click projects

Relay click is featured in many Libstock projects with different platforms, here is a selection:

• mikroWeb server example
• Voice controlled lights with SpeakUp and RELAY click
• Remote Relay Control Example with BeagleBone Black
• Remote Relay Control Example with Raspberry Pi
• SMS home alarm system with GSM click and RELAY click
• SMS Home Alarm 2
• Toggling Relay click with a PIC clicker, FlowStone project