What is RFID WIZ?

RFID WIZ is a slick new product by Smooth Technology. It can read and recognize RFID tags and use them to control devices. It's easy to train and has both a relay and 5V logic output so it can be easily integrated into any project. 

This board works with all MIFARE 13.56MHz RFID tags-- that includes cards, keyfobs, stickers, and more. 

Parts

Video of a white person with black nails registering an RFID card with an RFID reader PCB. When they lay the card over the reader, the reader lights up a green LED and signals the power relay.
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White card with quarter on top
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Flat rectangular cell phone trinket charm
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RFID sticker with coil imprinted
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RFID sticker with coil imprinted
This is a blank 13.56MHz RFID/NFC sticker - often used for inventory uses but also wherever a sticker is desired. The tag contains a small RFID chip and an antenna, and is...
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The RFID WIZ board has 2 power input sections and 2 signal output sections.

Power Input

projects_wizPower.jpg
Power input screw terminals (left) and power input barrel jack (right)

RFID WIZ needs 6-12VDC to operate. This can be provided via the Vin and GND screw terminals or the 2.1mm barrel jack.

Signal Output

projects_wizOutput.jpg
Relay output (left) and 5V logic output (right)

RFID WIZ has two signal outputs, both of which change state when the RFID WIZ is triggered:

  1. Relay output, which is broken into three screw terminals, NO, C, and NC:
    • If the relay is untriggered, the NC pin (Normally Connected) is mechanically connected to COM. NO (Normally Open) is mechanically disconnected.
    • When the relay is triggered, NC becomes disconnected from COM and NO is connected to COM
  2. 5V Logic output, which has two states:
    • High (SIG pin outputs 5V) when the board is triggered
    • Low (SIG pin is tied to GND) when the board is untriggered

 

Training a tag on the RFID WIZ couldn't be easier. Simply hold the tag over the red reader board and press the "Train" button.

You'll see the Status light flash green, and you'll see the green LED by the Relay light up as well. This will stay lit until you remove the tag. The green LED displays the state of the relay and 5v logic output. You'll also hear the click of the relay when it changes state.

You can repeat this process with multiple tags.  Training up to 20 tags has been tested with stability. Upwards of 40 should be possible but attempt at your own risk

This section discusses the three modes of the RFID WIZ. 

Two of the modes are accessed by flipping the RELEASE switch.

  • INSTANT Mode - The relay and 5V logic output will release as soon as the tag is removed from the reader board. 
  • DELAYED mode - The relay and 5V logic output will hold its state for 5 seconds after the tag is removed, and then it releases. This is useful for magnetic locks (maglocks) and other devices that need some time to "do their thing" (i.e. giving time for a spring to push a maglocked door open) 

The third mode is TOGGLE mode. 

  • TOGGLE mode is accessed by tapping the TRAIN button 3 times. In this mode, the state of the relay and 5v logic output is flipped every time the reader board sees a trained tag. It will hold that state until it sees a trained tag again. TOGGLE mode is indicated by an amber light on the Status LED. 
  • TOGGLE mode ignores the state of the RELEASE switch.

Controlling a maglock with RFID WIZ is easy! We can even use the Vin pin on the WIZ to power the maglock.

Mag Locks are generally available in 12VDC and 24VDC voltages. Make sure to use a maglock and power supply of the same voltage. Double check the current requirements of the lock and match the power supply appropriately.

Using the WIZ's power terminals

Follow the image above to make the following connections:

  • Vin to maglock + wire
  • C to maglock - wire
  • GND to NC

Note - this will only work with a 12V maglock.

This wiring will keep the maglock in the "locked" state until a trained card is placed in front of the reader board. 

Using an external power supply

In some cases, you might want to use an external power supply. In this case, the onboard relay is acting as a switch to connect and disconnect this external power supply. This would be handy if you're powering a device that needs more than 12VDC. Follow the image above to make the following connections:

  • Maglock connects to +VDC on the power supply and C on the WIZ relay 
  • Connect NC on the WIZ relay to -VDC on the maglock

This will work with either a 12VDC or 24DC maglock. Make sure to match your power supply voltage to your maglock voltage.

This wiring will keep the maglock in the "locked" state until a trained card is placed in front of the reader board. 

The onboard relay can switch up to 10A 250V. However, we recommend using caution if you are using more than 24VDC or any AC voltage source

This section will show you how to switch AC outlets using a Four Outlet Power Relay Module. You can also use this method to control any device that looks for 5V logic (such as an Arduino input). 

RFID WIZ 5V Logic Output

 

The RFID WIZ has a white JST PH (2mm pitch) jack with 2 pins

  • GND - always stays at 0V
  • SIG - switches from 0V to 5V when the relay flips

A 2-pin  JST cable is included with your kit, and can be used to connect to any device looking for a 5V logic input. 

The power relay module has corresponding inputs:

This guide was first published on Mar 16, 2022. It was last updated on 2022-03-16 14:24:50 -0400.