Hello Grumpy_Mike, My fingerprint module have their our own memory (150 fingerprints)... I just need to send commands to the fingerprint module from Arduinio!!!!
Do you think Im able to do those PIN connections (from fingerprint module to Arduino) and use serial lib to communicate??
I'm getting a very stranger signal... my FDTI chip at my arduino board is
burning ........ so....... do you think I can use the 3.3v from
arduino to power my fingerprint sensor?
do you think I can use the 3.3v from
arduino to power my fingerprint sensor?
Do you know how much current draw your fingerprint module requires? The 3.3vdc on your Arduino comes from a built in regulator in the FTDI chip and is pretty limited in current, 40-50ma I think. If would be pretty simple to wire up an external 3.3vdc regulator chip and feed it +5vdc from the Arduino board, that should give you a couple of hundred ma or so.
Well then your Arduino board will not be able to supply the 3.3v current load required. Some 3rd party Arduino clone vendors can supply more 3.3v current by having a on-board regulator that can handle that kind of current load, Seeeduino boards come to mind. Or as I said you could build an external 3.3v regulator circuit to supply that load.
Can I use 2 batery of 1.5volts each directly into the GND and Vcc of my fingerprint module and rx and tx directly to arduino p0(rx) and p1(tx) ? ?
Do you a link to a datasheet for the fingerprint module? It may work with two 1.5v batteries, but would have to see it's specifications. You would also have to wire the module and batteries ground to the Arduino ground. Then you would have to find out if the module was '5 volt tolerant" or not as the Arduino serial output is a 5vdc logic signal.
Well it doesn't give a voltage tolerance spec for the 3.3vdc, but I would think it would most likely work on two AA alkaline batteries. The serial interface says "Serial Interface (TTL Level)" to me implies that it is 5vdc tolerant as TTL is 0-5vdc spec, so it's worth trying out.
I hope it isn't too late??? I hope you won't connect 5v to the place you used to connect 3.3v until more senior people can express an opinion???
(Maybe I over-reacted, or misunderstood some things that appear above... but if I did, maybe other readers will too.)
As I read the .pdf about the device, it says that the interface to whatever is "talking" to the device is happy with TTL, so I wouldn't mind connecting 5v THERE (to the input). And I'd expect it to "drive" a 5v input on something the fingerprint reader's output was "feeding".... BUT that's very DIFFERENT from saying that the device will be happy with 5v for Vcc, i.e. attached to pin 1... isn't it, experts?
In other news....
Where did you find this little gem? What did it cost? (I "found" it online... but no prices!)
Do you need to do EVERYTHING via Arduino? Unless you have frequent changes of authorized users, it might pay you to use the vendor supplied app (is there one?) for registering fingerprints, setting security options, etc, and have the Arduino just capable of basic things like "pass/fail" checks of access attempts.
Im prepared to start the test with 5V... but i receive that notification of the forum and... i stoped the 5v BOMB!!!!
Thank you!!! I just have ONE fingerprint senseor at this moment with me ... and i cant burn that
Well, this one (fingerprint sensor) i have because in the past i worked in Potugal at a Biometric acess control company developping software for the company appliances.
At this moment Im developping personally projects (http://www.julianogimenez.com), and I would like to to build a small appliance (a fingerprint machine -small size-) with:
an Arduino Duemilanove;
a 3 key keyboard (Serial)
a Fingerprint Sensor (Serial -this one-
...
My idea is that little appliance will havea a StandAlone operation, but via USB we will be able to download the transactions (counting touchs , date and hour)
This Fingerprint Sensor from the PDF above can operate until 150 fingerprints inside. All fingerprint will be storage inside him.
The Arduino just will storage the operations (at the inboard memory or I will add external EEPROM chip to your project)
How many data can I store into arduino inmemory, considering:
xxx-ddmmyyyy-hhmm
where: xxx is the code of user, ddmmyyyy is the date and hhmm, hour?
