by ober » Tue Feb 22, 2011 3:12 pm
Well, you need to understand the purpose of DIY project. Cytron created DIY project for beginner and hobbyist to understand the operation of certain electronics device. Normally a PIC microcontroller is used as the controller to read, display, control and sometime communicate. It is not a ready to use product, yet the purpose is more to educational and learning.
1.what is the objective of the PR-25?
As explained above
2.what is the difference of PR 25 with the conventional lock?
Again, Allen has stated out the different. PR25 is not a ready product. Is a DIY kit for beginner to learn programming and method to integrate particular device with microcontroller
3.PR 25 easy broken or not?
It depends. If you apply with wrong voltage, shorted certain important pin, solder wrong polarity of components, wrong connection, etc. Yes, that will most probably damage the PR set. If you follow the steps in Details Description as many other did, it should not be problem to get it working
4.What factors can damage the PR 25?
As explained above
5.If i loss the RFID card ,how can i open the door?
If the is no modification on the current PR25, you can reset the PIC or power off it. Again, that depend on how you design your product.
6.PR 25 safety index???if PR 25 compared with the conventional lock.
We do not have that data.
7.How can we make sure that PR 25 can work without electricity?Can we solve it?
You can have back up battery if you like so.
8.Can we use another LCD instead of 28 pin LCD?
I think it should be 16 pin parallel LCD instead of 28 pin. It depends on what type of different LCD. If you are replacing other type of parallel LCD, it should be compatible.
9.Why that is no rectifier in the hardware list??Is rectifier replace by diode?Can give me the reason.
The rectifier is not necessary. It is not replace by diode, just in the design, diode is sufficient.