Intruder alarm

[krys]

Does this mean I finally get the circuit arrangement correct? If so, can I proceed to the designing of PCB? And, how do I burn the coding into the PIC?

[ABSF]

The High side of your 3 switches are connected to the Input side of the 7805. The voltage there might be too high for the PIC RA0-2. That is a potential hazard and might destroy your PIC in long run. And dont forget to put in your OSC circuit.

You might also put a 10 pin male socket for the UIC00B programmer. The component is "TRANS 10 DIL" and the footprint on PCB should match the socket used by the cytron programmer. I seldom make PCB cause most of my projects are using stripboard combined with wire wrapping. May be someone who is familiar with Proteus PCB can help you.

Why not just make one and see if it works. That way you can learn from errors.....

Allen

[ABSF]

I checked the cytron site and found that the whole PR14 kits only costs rm88. It includes a 16f876, buzzer, one PIR module and a glass fibre PCB and the programmer socket. Easy to trouble-shoot if it is not working. You can order it together with the UIC00B programmer as well.

Saves you all the troubles making your own PCB.

Allen

[krys]

What is the state (H or L) of MCLR when your circuit is running.
In you DC supply, you use Vdd and Vcc interchangeably. Was it allowed by Proteus?
Try put a DC voltmeter on all the Vcc and Vdd points and see if +5V is there.

The 7805 and the crystal osc circuits are optional for the simulation unless you want to make the PCB. You can leave them out for simplicity.

Allen

Will it affect the real hardware if I just cut the crystal since the simulation is running normally even without it? And why the Vdd and Vcc is 5V instead of other value?

[ABSF]

The 7805 and the crystal osc circuits are optional for the simulation

I only said they are "optional" for the simulation BUT I didn't say "you can leave them out in the PCB", did I?

Well, the best way for you to find out is this......You just include the copper trace of cyrstal in the PCB but dont mount them in the PCB. See if it work or not, OK? In some PICs, they do have a 4MHz internal RC oscillator, but I am not sure about 16F876. Try to read the datasheet yourself.

As the other question about Vdd and Vcc, I'll let you find out yourself in the Protues Help files or just google on them.

Allen

[krys]

So, if they have internal RC oscillator, then it's okay to cut out the crystal part?

[robosang]

This is what happen when people help..... they ask for more, right , agree Allen?

PIC16F876 do not have internal oscillator, an external oscillator is a must. Only the new model such as PIC16F886, 887, 1933....etc have internal oscillator.

That is one of the reason those that do simulation cannot do real hardware, too many of assumption in simulation. The result? They say I DID it in simulation, everything works as program, but why the hardware cannot work, it must be the hardware problem

[ABSF]

I dont see it this way.... Some people like to learn the easy way but some like to learn the HARD way. It is all our choices. I never get upset about it. May be on the way to finding out the truth the hard way, he can remember better vise versa. Anyway I appreciate his enthusiasm and curiosity to learn. Some others are just too shy to ask stupid questions..


Allen

[Brian Griffin]

Depending too much on the simulation isn't going to help the design either. The hardware should be built and tested accordingly.

[krys]

Thanks for your help. Everything went okay, though the buzzer buzz non-stop right after the circuit is connected to the battery.