Hi all.
I buy Adafruit fingerprint sensor, which have 6 wires.
I can't find any documentation what is TCH wire and VA used for?!
Another questin is how to control fingeprint light?! Can we turn on or off that light?!
Adafruit has documentation for their products on their web site.
Yes, I tried to find documentation but there is only documented 4 wires function.
I'm not sure what other two wires may be.
On sensor pins are marked as TCH - blue wire, and VA - green wire.
Sensor works without that two wires, but I'm interested if there is a way to turn of sensor led light during inactivity. Maybe these two wires are for that functionality.
Thanks in advance.
It's not clear on the Adafruit site who makes that fingerprint sensor. I'm guessing that it's an R307, which according to an image search has a pin for touch and a pin for touch power. Adafruit says those pins are not connected though.
In any event, they're not going to help you with turning off the led.
PIN. DESCROPTION WIRE COLOR
VCC power supply 3.3V red
TX data output (TTL) yellow
RX data input (TTL) white
GND ground black
TCH finger detection signal blue
VA finger detection power 5V green
TCH goes to an input. It is actvated when the finger is presented on te sensor.
But how to control background light of fingerprint sesnsor?!
Does the touch detection work?
Does it work without VCC?
If so, you could leave the power to the sensor off, presumably killing the LED and only turn it on when a touch is detected. Then leave it powered up for some period and turn it off again.
schomke:
Another questin is how to control fingeprint light?! Can we turn on or off that light?!
Doesn't the scanner need that light to detect the presence of a finger?
Switch the 5V power line of the sensor (p-channel MOSFET), when you power it off, light will be off. The moment you want to detect a finger, switch it on again. Remember to initialise the sensor and its library again when doing this.
From specification this sensor seems really similar to my R302 fingerprint sensor: R302 Fingerprint sensor finger detection - Sensors - Arduino Forum
I still didn't figured out how to connect the finder detection pin input/output
CrazYoshi:
From specification this sensor seems really similar to my R302 fingerprint sensor: R302 Fingerprint sensor finger detection - Sensors - Arduino ForumI still didn't figured out how to connect the finder detection pin input/output
Try to use just pins 5, 6.
From Arduino borad connect 3V3 to pin 6 of fingerprint sensor.
From pin 5 on fingerprint sensor go to some I/O pin on Arduino board.
Make sample program to detect finger on sesnsor.
I want to ask, what method algorithm does this library use?
thank you
Hi, someone know how to list the used ID with the adafruit library?
Thanks