555 Alarm / Timer Circuit [VERY EASYYY!!!]
Intro: 555 Alarm / Timer Circuit [VERY EASYYY!!!]
hi all, this is my first instructable, i hope you enjoy, and if you have any questions dont hesitate to ask me either by sending me an E-mail (Ahmedyasserahmed@gmail.com) or simply comment and i will do my best to answer all of your questions.
in this instructable i will explain how to build a simple 555 circuit that will blink a led and sound a buzzer, this has many application for example you can connect an LDR between the power source and the circuit and then put it in your closet where it is dark and when someone opens the closet the alarm will sound, or connect it to a transistor LDR circuit (which i will explain how to build in another instructable) and put it next to your door so if any one passes by the LDR his shadow will cause the alarm to sound.
Materials that are required:-
1- 10 kohms resistor
2-4.7 Kohms resistor
3- 470 ohms resistor
4- 555 IC circuit
5 Jumper wires
6-LED
7-capacitor (47 uf)
8-Buzzer
9-Battery and holder (rpeferably 9v but anything between 5-12 will work)
STEP 1: Connecting the Brain
STEP 2: Connecting the Capacitor
STEP 3: Connecting Pins 2 and 6
in a breadboard there is a gap between the 2 sides in the power supply row be sure to connect them (look at the photo)
STEP 4: Pins 4 and 8
STEP 5: Resistors Time!
STEP 6: Next Resistor
STEP 7: One Last Resistor
STEP 8: Connecting the Led
STEP 9: Connecting the Led to the Brain
STEP 10: Connecting the Buzzer
STEP 11: Feeding the Brain
by now yoyr breadboard is ready. lets connect the power
STEP 12: Finishing Up
And there you go attach your battery.
STEP 13: Working and Troubleshooting.
if you want it to be light sensitive connect an LDR between the battery and the circuit.
Have fun
21 Comments
Aywa_Baity 5 years ago
aqsa adrees 6 years ago
Hi,i wanna make a project in which i wanna attach buzzer with bluetooth module led ..as blinking of module led become stable as module interfaced with android bluetooth ...i wish buzzer should off as blinking become stable ...i really need help in this regard
Bravopaddy 6 years ago
Thanks for your post.
Please can you help me out?. I want to make a timer alarm that can sound at 12pm and 6pm
Willyd57 7 years ago
This works great! thanks for posting it. At first, I thought it was not working because I could not hear the 8 Ohm 0.5W speaker. Then I realized the speaker was clicking very quietly at about two clicks per second. You can either listen to the speaker or unplug the speaker and watch the LED blink at the same rate.
RedNez 9 years ago
i am using a 5v buzzer and it doesn't buzz
just a little tic
AnkeshP 7 years ago
Remove the buzzer and check if LED id glowing, if not try using lower capacitance value. 0.047uF worked for me
AY Electronics 9 years ago
RedNez 9 years ago
im sorry but i didn't realize that i have AC buzzers :P
i tried it with DC buzzer and worked perfectly
gimson 8 years ago
AnkeshP 7 years ago
yes
HashirA5 7 years ago
HashirA5 7 years ago
hesam.time 11 years ago
etaiNET 8 years ago
AY Electronics 11 years ago
AY Electronics 11 years ago
Flimzy 10 years ago
What spec of buzzers can be used?
AY Electronics 11 years ago
zomfibame 11 years ago
superjohn1989 11 years ago
i did it and it totally works i added the LDR as you told us and it works perfectly