Advise on my diagram

Projects General Guidance
1

I'm planning to do door lock by knock sensor ( from outside) and PIR motion sensor (from inside).The problem arises as I dont have any extra power source to power up the 12V lock so I try to use step-up module and do something like this:

Parts:
XL6009 DC-DC 4A Step-Up
PIR Motion Sensor HC-SR501
Piezo Electric Disc
5V 1 Channel Relay Board Module
12V Selenoid

1833×825 77.5 KB

Rough coding:

void loop(){ 
listenknock(); 
if(validateknock() == true || motiondetect() == true) { doorunlock(); } 
 }
void listenknock() {//listen to knock from D9 }
void validateknock() { //return true on correct knock }
void motiondetect() { //read D8 }
void doorunlock() { //trigger D7 }

Do you think this will work?

2

Congratulations on posting a picture we can see!

Your diagram is difficult to read it follows no conventions, uses undefined abbreviations and gives no clue as to the software used.

Please elaborate: What step-up module, what are the other components (please provide data sheets or a link to the item), and some code that illustrates how you use the signals would be good.

Thanks.

nzmiii:
I'm planning to do door lock by knock sensor ( from outside) and PIR motion sensor (from inside).The problem arises as I dont have any extra power source to power up the 12V lock so I try to use step-up module and do something like this:

1280×957 48.7 KB

Do you think this will work?

3

If you have a plain relay, you cannot drive it directly from an Arduino pin. You'll need a transistor, base resistor and flyback diode. Either that, or get a relay module with all that and maybe more.

What appears to be a piezo buzzer has 3 connections to it. I'd have expected two.

4

6v6gt:
If you have a plain relay, you cannot drive it directly from an Arduino pin. You'll need a transistor, base resistor and flyback diode. Either that, or get a relay module with all that and maybe more.

What appears to be a piezo buzzer has 3 connections to it. I'd have expected two.

Im using this

Suppose to be two connection but i'm using this board.

957×1280 102 KB

5

ChrisTenone:
Congratulations on posting a picture we can see!

Your diagram is difficult to read it follows no conventions, uses undefined abbreviations and gives no clue as to the software used.

Please elaborate: What step-up module, what are the other components (please provide data sheets or a link to the item), and some code that illustrates how you use the signals would be good.

Thanks.

Thanks for reply. Updated post with proper elaboration