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Fingerprint Module with Door lock Solenoid - Arduino Nano .. Need help
QLF:
Greeting,
Thank you for your support guys.
I am a newbie to the Electronics, but I did read for a long time and search but this is my first circuit it may look easy for you but I need help.
Here are two schematic and I need them to be joined together with Op protection and reverse voltage protection as well.
The project is a Solenoid door lock I will add a Finger Print module operated with Arduino Nano to open it.
In fact, the solenoid is operated by normal doorbell intercom, so the project here is to make both ways to open the solenoid the fingerprint module and the intercom.
Please note:
- The solenoid needs 1.8amp to open.
- Reverse voltage protection due to the power will come to Arduino when solenoid opened from the intercom.
- I have a TIP122 Transistor if needed.
- Arduino Nano will be used in the project.
- Pin 9 or any will be used to send a signal to the transistor to pass the power required to open the solenoid.
- Over 12v protection for Arduino nano if dual input power source will be used.
The scenario:
* Normal intercom button should open the solenoid.
1- Fingerprint Module read the fingerprint
2- Arduino Nano received the data approved then send a signal from pin 9 to transistor tip122 to open
3- transistor tip 122 opens and passes the current to open the solenoid.
4- Fingerprint Module sleep mode after inactive for specific time.
Please try to consider the size of the circuit if possible need to be a small or good size to be placed behind the door of the house.
Thanks a lot.
Yousif
QLF:
:-//
QLF:
Is it possible to use opto-coupler or reed relay to bridge the intercom push-button? and how can i made the circuit?
Marco:
What's the bell? What's the handset? Why are they in series?
The transistor is burning 2 Watts when on, it's going to get toasty quite quickly when on (over 100 degrees without a heatsink).
It's possible that the intercom button switches a voltage to the high side of the solenoid, but it would be easier if the high side of the solenoid is connected to 24V and the intercom button connects the lower side to ground ... that might be possible by simple rewiring. Then you can put your transistor in parallel with the intercom button.
QLF:
This is the Bell & the handset:
The main question is how to add Arduino nano &/to verify the finger prints came from the finger print module which will add in this setup in order to open the solenoid lock through finger print "AND" the button in the headset after the bell is ringed?
Its doesn't matter If I will change the whole setup but I need to make this project work without problem.
Thank you for reply waiting for your update.
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