|Since||Origin / Contributor||Maintainer||Source|
|2020-07-08||Cody Cutrer||Cody Cutrer||wiegand.c|
This module can read the input from RFID/keypad readers that support Wiegand outputs. 4 (keypress) and 26 (Wiegand standard) bit formats are supported. Wiegand requires three connections - two GPIOs connected to D0 and D1 datalines, and a ground connection.
Creates a dynamic wiegand object that receives a callback when data is received. Initialize the nodemcu to talk to a Wiegand keypad
wiegand.create(pinD0, pinD1, callback)
pinD0This is a GPIO number (excluding 0) and connects to the D0 data line
pinD1This is a GPIO number (excluding 0) and connects to the D1 data line
callbackThis is a function that will invoked when a full card or keypress is read.
The callback will be invoked with two arguments when a card is received. The first argument is the received code, the second is the number of bits in the format (4, 26). For 4-bit format, it's just an integer of the key they pressed; * is 10, and # is 11. For 26-bit format, it's the raw code. If you want to separate it into site codes and card numbers, you'll need to do the arithmetic yourself (top 8 bits are site code; bottom 16 are card numbers).
wiegand object. If the arguments are in error, or the operation cannot be completed, then an error is thrown.
local w = wiegand.create(1, 2, function (card, bits) print("Card=" .. card .. " bits=" .. bits) end) w:close()
Wiegand Object Methods¶
Releases the resources associated with the card reader.