DFRduino HJR4102 4-channel Relay Shield

SKU: DFR0144

The HJR4102 4-channel Relay Control Board features the Relay shield V2.1, capable of controlling four relays with a maximum switching power of DC 90W or AC 360VA. It can be controlled through Arduino/DFRduino using digital IOs with an external 7 to 12V supply. The built-in Xbee socket allows wireless control via Xbee/bluetooth/WPM, making it an ideal solution for automation and robotics.

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1. Example Code for Arduino-Basic Relay Switching

This article offers a comprehensive guide on using Arduino for basic relay switching, detailing hardware and software requirements, wiring diagrams, and sample code for controlling appliances safely.

2. Example Code for Arduino-Serial Controlled Relays

This article offers a detailed guide on using Arduino to control relays, including hardware preparation, software setup, wiring diagrams, and sample code. It explains how to safely connect and control lamps or appliances through relays using serial inputs, emphasizing the importance of careful handling of live circuits.

Reference

This article offers an in-depth guide on programming and testing modules, highlighting the use of PROG SWITCH, relay buttons, servo power supply, and XBee interface for versatile wireless communication capabilities.

Parameter	Specification
Contact Rating	3A AC 120V / DC 24V
Max Switching Voltage	AC 240V / DC 60V
Max Switching Current	5A
Max Switching Power	AC 360VA / DC 90W
Electrical Life (Min)	100,000 Operations
Mechanical Life (Min)	10,000,000 Operations
Safety Standard(relay)	UL cUL TUV CQC
Coil Working Voltage	9VDC
Working temperature	-30℃ to +85℃
Working temperature	40% - 85%


Pin	Pin State:HIGH	Pin State:LOW
Digital 2	NC1 is disconnected with COM1	NC1 is connected with COM1
	NO1 is connected with COM1	NO1 is disconnected with COM1
Digital 7	NC2 is disconnected with COM2	NC2 is connected with COM2
	NO2 is connected with COM2	NO2 is disconnected with COM2
Digital 8	NC3 is disconnected with COM3	NC3 is connected with COM3
	NO3 is connected with COM3	NO3 is disconnected with COM3
Digital 10	NC4 is disconnected with COM4	NC4 is connected with COM4
	NO4 is connected with COM4	NO4 is disconnected with COM4
Note: NC: Normally Closed; NO: Normally Open.

FAQ

I got te shield working with several types of code but need to have both 9V power and USB cable conected. This can't be right.?

Please check if your power supply was working correctly.
With your relay shield v2.1 is it possible for the Arduino to read the status of some of the digital I/O pins of an XBee? Because the XBee is 3.3 volt there would need to be a logic level converter on the board, I believe.

It is OK. 3.3V will be recognized as high level.
Is it possible to use Arduino D4 to control Relay 1?

It's easy to make it just by removing the jumper on the board and then connect the pin of Relay1 to any Digital pin you need.
https://raw.githubusercontent.com/DFRobot/DFRobotMediaWikiImage/master/Image/Relay_Shield_DFR0144_sch_for_xbee.png
I uploaded the first sketch to arduino, the 4 relays should be turned on and off every second, but nothing happened. What did I miss?

It needs an external power supply to drive the xbee module and relays. Suggested: 7-12V.
I uploaded the first sketch to arduino, the 4 relays should be turned on and off every second, but nothing happened. What did I miss?

It needs an external power supply to drive the xbee module and relays. Suggested: 7-12V.

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DFRduino HJR4102 4-channel Relay Shield

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