#147

A really simple fingerprint reader that takes just minutes to install for the ultimate in security! Includes R307 and Adafruit compatible versions.

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Much more information and examples in my GitHub:
https://github.com/RalphBacon/Arduino...

I'm using two different (but very similar) fingerprint readers here, an R307 and a slightly different, Adafruit-compatible version. I show here how to enrol fingerprints using the Windows (only) demo program and then read them back on the Arduino to power a small door lock. Both fingerprint readers operate **identically**, but have different coloured wires!

You can do everything on the Arduino, of course, but it makes sense to use the Windows' utility IDE first to ensure it all hangs together. I show you how to do this, all very easy once you have chosen a suitable Arduino UNO to use.

Suitable Arduino Uno?
My original attempts at getting my R307 fingerprint reader working (over two years ago) came to nothing. Now, thanks to some comments in the Adafruit article I figured I needed an Arduino UNO with a "proper" USB to Serial converter, such as the µController found on the original Arduino Uno (an ATMega16U2). Luckily, I had an old, possibly cloned, version of that board and it all sprang into life, so very easily! So check whether your UNO uses a CH340G (no go) FTDI (might work) or a 16U2 (best solution).

Like this one: Geekcreit® Arduino Compatible UNO R3 ATmega16U2 AVR USB Development Main Board On offer until May 31st 2019
http://bit.ly/ArduinoV316U2

Door locks
I didn't amend the Adafruit demo sketch for the Arduino to read the fingerprints, other than to power up the door lock if it found a matching fingerprint. There are dozens of different, 12v door locks out there - check what you need and how to fix it before buying one! Also, bear in mind that these locks take quite some current (the small one I used needs just under 400mA).

The Adafruit library that I used is also in my GitHub so we know that version will work, but it's always worth checking to see whether an updated version is available that might add features, correct bugs or make it compatible with other hardware.

Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!

Note that there are various PDF files on the fingerprint readers that you may find useful in my GitHub

LINKS (some may be affiliate links that help my channel)

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The Adafruit fingerprint library (also a snapshot in my gitHub):
https://github.com/adafruit/Adafruit-...

R307 fingerprint reader as used in the demo:
http://bit.ly/BanggoodR307

The R307 fingerprint sensor also available from Amazon, not bad prices:
UK: https://amzn.to/2Eq0J8F
USA: https://amzn.to/2VDrhJu

Adafruit-like (possibly the same) fingerprint reader, as used in the demo:
http://bit.ly/BanggoodAltSensor

The official Adafruit fingerprint reader (currently out of stock (May 2019) but will doubtless return):
https://www.adafruit.com/product/751

AliExpress version of the R307:
http://s.click.aliexpress.com/e/AW5PLYc

Small drawer lock, as used in the demo, 12v 400mA (approx):
http://bit.ly/BangoodDrawerLock

Geekcreit® Arduino Compatible UNO R3 ATmega16U2 AVR USB Development Main Board On offer until May 31st 2019 http://bit.ly/ArduinoV316U2

Electric door lock example (not used in the demo):
http://bit.ly/BanggoodFullDoorLock

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My channel and blog are here:
   / ralphbacon  
https://ralphbacon.blog