Overview
The Arduino 4 Relays Shield is a solution for driving high power loads that cannot be controlled by Arduino's digital IOs, due to the current and voltage limits of the controller. The Shield features four relays, each relay provides 2 pole changeover contacts (NO and NC); in order to increase the current limit of each output the 2 changeover contacts have been put in parallel. Four LEDs indicate the on/off state of each relay.
Getting Started
You can find in the Getting Started section all the information you need to configure your board, use the Arduino Software (IDE), and start tinker with coding and electronics..
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- On the Software on the Arduino Forum
- On Projects on the Arduino Forum
- On the Product itself through our Customer Support
Tech specs
Features
| Thinker Kit interface | 2x TWI, 2x OUT, 2x IN |
| Interfaces with Arduino Board | DIO |
| Relays | 4 (60W) |
General
| Operating Voltage | 5 V |
| Current needs | 140 mA (with all releays on, about 35 mA each) |
| PCB Size | 53 x 68.5 mm |
| Weight | 0.044 Kg |
| Product Code | A000110 |
Conformities
Resources for Safety and Products
Manufacturer Information
The production information includes the address and related details of the product manufacturer.
Arduino S.r.l.
Via Andrea Appiani, 25
Monza, MB, IT, 20900
https://www.arduino.cc/
Responsible Person in the EU
An EU-based economic operator who ensures the product's compliance with the required regulations.
Arduino S.r.l.
Via Andrea Appiani, 25
Monza, MB, IT, 20900
Phone: +39 0113157477
Email: support@arduino.cc
Documentation
OSH: Schematics
The Arduino 4 Relays Shield is open-source hardware! You can build your own board using the following files:
EAGLE FILES IN .ZIP SCHEMATICS IN .PDF
Description
|
Operating Voltage |
5V |
|
Coil current consumption |
140 mA (with all releays on, about 35 mA each) |
|
Single pole chargeover contact maximum current |
@ 30 V DC 2A |
|
Maximum load voltage |
48 V |
|
Maximum switching capacity |
60 W |
Power
The shield doesn't need external power: it will be provided by the base board, through the 5V and 3.3V pins of the Arduino board used as base.
Input and Output
The relays are controlled by the following Arduino board pins: Relay 1 = Arduino pin 4 Relay 2 = Arduino pin 7 Relay 3 = Arduino pin 8 Relay 4 = Arduino pin 12 The shield features several TinkerKit input/output and communication interfaces. Connecting TinkerKit modules can simplify the creation of a project or a prototype. The on-board connectors are :
- 2 TinkerKit Inputs: IN2 and IN3 (in white), these connectors are routed to the Arduino A2 and A3 analog input pins.
- 2 TinkerKit Outputs: OUT5 and OUT6 (in orange), these connectors are routed to the Arduino PWM outputs on pins 5 and 6.
- 2 TinkerKit TWI: these connectors (4-pin in white) are routed on the Arduino TWI interface. Both connect to the same TWI interface to allow you to create a chain of TWI devices.
Physical Characteristics
The maximum length and width of the 4 Relays Shield PCB are 2.7 and 2.1 inches respectively. Four screw holes allow the Shield to be attached to a surface or case. Note that the distance between digital pins 7 and 8 is 160 mil (0.16"), not an even multiple of the 100 mil spacing of the other pins.
Compatible Boards
The shield is compatible with all the Arduino boards, 5V and also 3.3V standards.
Learn more
Get Inspired
My project has a Nodemcu ESP8266 which is controlling a 7-segment display through the http server using html form.
… remote monitoring and control. 2. Embed a web server in the device Embedding a web server inside the IoT device allows you to visualize the data using a web browser. It requires the device to have network connectivity, and it is usually implemented connecting the device to a Wi-Fi access point or with the device creating its own WiFi hotspot. Although creating your own web server implementation can be done, one of the most widespread solutions is to make use of the library ESPAsyncWebServer. It allows your IoT device to serve custom HTML pages presenting the data. This is a very flexible and customizable solution, yet complex and mostly suitable for skilled users. There are plenty of insightful examples like the following ones: ESP32 Web Server - Arduino IDE | Random Nerd TutorialsArduino Project Hub - NodeMCU ESP8266 AJAX Enabled Web Server Arduino Project Hub - WiFi Robot Car / RC Car NodeMCU Web ServerESP32 Web Server: Display Sensor Readings in Gauges | Random Nerd Tutorials The scope of this solution is typically local — you need to be on the same network as the device — although with a more advanced configuration by enabling port forwarding in the router, the device could be accessed remotely from anywhere. One of the main advantages is its low latency, as the data shown in the web page comes directly from the device without any processing. On the other hand, it is a solution that requires a high programming skill level and additionally, due to the immutable nature of the firmware, every change in a dashboard requires code recompilation and firmware reflashing. Furthermore, embedding a web server or a Bluetooth stack within the device can be resource-intensive. This may limit the device's capabilities or require a more powerful microcontroller, increasing both cost and complexity. 3. Send data to an external system with plotting capabilities IoT devices can send data to external systems using different protocols, such as
