Relay 4 Click Board™

Product Code: MIKROE-5539

How Does The Relay 4 Click Board™ Work? The Relay 4 Click Board™ is based on dual J1031C3VDC, high-current single-pole double-throw (SPDT) signal relays from CIT Relay and Switch. The J1031C3VDC relay is well known for its reliability and durability, high sensitivity, and low coil power consumption housed in a small package with PC pin mounting. Despite its size (12.5x7.5x10 millimetre (LxWxH)), the J1031C3VDC relay can withstand up to 2A and 125VAC/60VDC maximum. These relays are designed to easily activate their coils by relatively low currents and voltages, making them a perfect choice that any MCU can control. As mentioned, the contact configuration of the J1031C3VDC is a single-pole double-throw (SPDT), which means that it has one pole and two throws. Based on the default position of the pole, one throw is considered normally open (NO) while the other is normally closed (NC), which is, in this case, its default position. When the coil is energized, it will attract the internal switching elements similar to a switch.

The Relay 4 Click Board™ uses two mikroBUS™ pins for its proper operation, the RL1 and RL2 pins routed to the RST and PWM pins of the mikroBUS™ socket. These pins control small N-channel MOSFET RET (Resistor Equipped Transistor) transistors that provide enough current for the relay coil. Two resistors are already integrated into the RET, providing it with the correct biasing and simplifying the design. Also, each relay has its own yellow LED indicator, which signalizes the state of the relay. When the current flows through the RET, the coil will be energized, and the relay will be switched from a closed to an open switch state. The Relay 4 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 Type Relay Applications Can be used for controlling high-power applications On-board modules J1031C3VDC - general-purpose signal relay from CIT Relay and Switch Key Features Low power consumption, reliable switching, high current, hig sensitivity, PC board mounting, SPDT configuration, relay activity indicators, and more Interface GPIO Compatibility mikroBUS Click board size L (57.15 x 25.4 mm) Input Voltage 3.3V PINOUT DIAGRAM This table shows how the pinout of the Relay 4 Click Board™ 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 RL2 Relay 2 Control Relay 1 Control RL1 2 RST INT 15 NC NC 3 CS RX 14 NC NC 4 SCK TX 13 NC 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 Label Name Default Description LD1 PWR - Power LED Indicator LD2-LD3 REL1-REL2 - Relay Activity Status LED Indicators RELAY 4 CLICK ELECTRICAL SPECIFICATIONS Description Min Typ Max Unit Supply Voltage - 3.3 - V Current Rating - - 2 A Switching Voltage - - 60 VDC