Tap several RFID/NFC tags on RFID-RC522 module. Click Upload button on Arduino IDE to upload code to Arduino. Copy the above code and open with Arduino IDE. Click Install button to install MFRC522 library. Search MFRC522, then find the library by GithubCommunity. 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. On Arduino IDE, Go to Tools Manage Libraries. On top of relay modules, you will see channels which are the black cube as seen above. They are designed to be controlled with low voltages like 3.3V like the ESP32, ESP8266, etc, or 5V like your Arduino. Four screw holes allow the Shield to be attached to a surface or case. The relay module is an electrically operated switch that can be turned on or off deciding to let current flow through or not. The maximum length and width of the 4 Relays Shield PCB are 2.7 and 2.1 inches respectively. The max switching power DC 90W or AC 360VA gives direct control. Both connect to the same TWI interface to allow you to create a chain of TWI devices. This Arduino Shield is a completely newly designed that is able to control 4 relays at a time. 2 TinkerKit TWI: these connectors (4-pin in white) are routed on the Arduino TWI interface.2 TinkerKit Outputs: OUT5 and OUT6 (in orange), these connectors are routed to the Arduino PWM outputs on pins 5 and 6.2 TinkerKit Inputs: IN2 and IN3 (in white), these connectors are routed to the Arduino A2 and A3 analog input pins.Connecting TinkerKit modules can simplify the creation of a project or a prototype. 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. 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. Four LEDs indicate the on/off state of each relay. 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. The library is an installable ZIP file for the Arduino IDE and includes two demo sketches to show its function.ĭownload CANADUINO® I2C Relay Library (incl.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. We designed a library for Arduino which makes it very easy to address every single relay in a stack of up to 8 modules (max. Unfortunately, the design flaws of Arduino UNO and MEGA boards make it impossible to use “stock” spacers in all four corners. We include a set of short and long Nylon spacers (M3) that can easily be modified (cut) to fit. UNO, MEGA, Leonardo), or by an external 5V source connected to the screw terminal if it is a 3.3V Arduino module (e.g. The relay modules are powered by the 5V line available on every 5V Arduino module (e.g. Copy the above code and open with Arduino IDE. The relays have normally open (NO) and normally closed (NC) contacts to drive loads up to 750VA or larger contactors for even higher switching capacities. The relays can switch loads up to 3A 250VAC per relay output. It communicates with any compatible 3.3V and 5V Arduino module through its I2C interface and only requires the two I2C signals to address up to 64 relays. CANADUINO® Stackable I2C Relay Shield for Arduino is available as assembled and tested module or as a DIY soldering kit with all SMD parts already assembled. The Arduino 4 Relay Shield is a solution for driving high power loads that cannot be controlled by Arduinos digital IOs, due to the current and voltage.
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