Long range IR sensor circuit diagram

In a previous post, I made an Infrared sensor that has a maximum range of only 5 centimeters but my audience want more detector range so I made the circuit for him and for all of you who interesting in DIY electronic project!!!The circuit use opamp comparator configuration that stable than a previous circuit that I use just two transistors to make the job done. This circuit has detector range about 25 centimeters and can easily adjust detector range easily with a potentiometer(R4 in the below picture). You may need to block strong light expose directly to an Infrared sensor or the circuit will always turn on forever.  You can find the electronic components details in the above picture and you can see the instruction on my video below.

You can ask any question on the comment box below if you have any question about this project. Enjoy DIY world!!!

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Blogspot gives you a free upgrade from HTTP: to  HTTPS: for free. Now your website will rank better in Google search with HTTPS and a user will feel more secure when surfing to your website. 

What is HTTPS? According to google support website. What a security certificate isWhen you go to a site that uses HTTPS (connection security), the website's server uses a certificate to prove the website's identity to browsers, like Chrome. Anyone can create a certificate claiming to be whatever website they want. To help you stay on safe on the web, Chrome requires websites to use certificates from trusted organizations.
How to get free HTTPS to your Blogspot (including custom domain one)When you blogger dashboard you just navigate to Setting > Basic and you will see the page like the image below. All you have to do is Change HTTPS Availability and HTTPS redirect to yes and your website will automatically change to HTTPS in a few minutes.

I hope this tips will make your website more prof…

Humidity sensor with led alarm | Arduino project

This page contains Arduino Humidity sensor with led alarm source code. This project is good for someone who wants to make a humidity meter or hygrometer with led alarm if humidity and temperature over a threshold. It's easy to make and doesn't require an external power supply, just use power from an Arduino UNO R3 board (USB power compatible with this project).

Electronic components list:
1 x Arduino Uno R3
1x 20 x4 I2C LCD display
1 x AM 2320 humidity/temp sensor
1 x 5 mm led ( 2 x if you plan to use led for pin 13 instead built-in led)
1 x 1000 ohms resistor ( 2 x if you plan to use led for pin 13 instead built-in led)
Any USB power adapter, 500 mA current at least.

Here is the Arduino code:
AM 2320 library
LCD display i2c library

#include <Wire.h>
#include <AM2320.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F, 20, 4);
AM2320 th;
int led2 = 12;

How to make an emergency led light

This video shows you how to make an emergency light, it is the very important thing when a 110/220 AC power failure. This circuit will make your life better!!!This emergency led light project use minimal electronic components and can work over 10 hours and recharge automatically. The circuit uses USB power supply so you can use old smartphone adapter as power supply, 5 volts, and 1 Ampere is the minimum required for this circuit.
Electronic component list:
1 x 18650 Li-ion battery1 x TP 4056 Li-ion battery charger module1 x 5 volts relay1 - 10 x 100 ohms resistor1 - 10 x low current white led (another color is ok but white led is the best)5 volts 1 Ampere USB type c adapterReal electronic components picture
After you got all the electronic components I listed above, it's time to make the circuit by watching my video.

This circuit has a very long life, all you need to change is 18650 battery(many years). You may need to recharge the battery once a month by disconnect USB adapter and le…

How to build high current hall effect sensor

I published hall effect sensor circuit diagram and my audience asked me how to make a hall effect sensor that has a high current capability, so I made it for him and for all of you who want to build high current hall effect sensor.

Normally, hall effect sensor used for detect magnetic field and send output to a microcontroller, that means any hall effect sensor doesn't need to have high current output. However, if you want to drive motor or any high current device without a microcontroller, this circuit is the best for you.
List of components for this project:
1 x IRF 9540N (P channel MOSFET) 1 x A3144 hall effect sensor 1 x 1 kilo-ohms resistor 1 x 10 kilo-ohms resistor optional (use for led indicator) 1 x 1 kilo-ohms resistor 1 x White, red, blue or any other low current led
Note: all resistor for this circuit is 1/4 watt, 20 % tolerance is ok with this circuit.

The principle of this circuit:
When hall effect sensor detects magnetic field, it sends output low (0 volts) to P channe…

How to make an IR toggle switch

Hello, today I will show you how to make an IR toggle switch with Arduino and a Mosfet, it has far more detection range than capacitive touch device and easy to build. The circuit is easy to use and use minimal components to make a job done, now let's start
Components list:
R1 = 100 ohms resistor
R2 = 470 Kilo-ohms resistor
R3 = 10 Kilo-ohms resistor
R4 =1000 ohms or 1 kilo-ohms
IR1 = infrared led
IRR1 = infrared receiver
led = low forward voltage led, you can find it on any electronic part store
Tube1 =Shrink tubing
1 x irf9540n p-type Mosfet

If you have the components I list ready, it's time to upload this code to your Arduino UNO r3

/* switch
 * Each time the input pin goes from LOW to HIGH (e.g. because of a push-button
 * press), the output pin is toggled from LOW to HIGH or HIGH to LOW.  There's
 * a minimum delay between toggles to debounce the circuit (i.e. to ignore
 * noise).  
 * David A. Mellis
 * 21 November 2006
* little edit by
*16 Januar…

how to make an automatic faucet

Now you will not forget to close your faucet or waste water when you pick a soap to wash your hand or face. This project shows you how to make an automatic faucet, you can even use the faucet that water valve damage because of this circuit use solenoid valve to control water.Electronic components you need:
1 Arduino Uno R3
1 TR1 = IRF 540n N channel MOSFET
1 Sensor1 = IR sensor
1 IR1 = IR led
R1 = 10 kilo-ohms
R2 = 100 ohms
R3 = 4.7 kilo-ohms
1 12 volts solenoid valve
12 volts 1 Ampere adapter

The Arduino code is very simple and you don't need to load any special module to make this project works

 created 29 Dec. 2008
 modified 9 Apr 2012
 modified 20 Oct 2017
 by Tom Igoe

 This example code is in the public domain.


// These constants won't change.  They're used to give names
// to the pins used:
const int analogInPin = A0;  // Analog input pin that the ir sensor is attached to
const int analogOutPin = 9; // Analog output pin that the LED is attached to

int senso…

3 ways touch selector switch circuit diagram

Hello, today I'm going to show you how to make a 3 ways touch selector switch. This electronic project makes you switch 3 electronic loads  (light bulb, electric fan) to switch on/off by touch the sensor.
Let's start!!!
Components you need:R1,R2,R3,R4,R5,R6 are 1 kilo-ohms resistor R7 = 10 kilo-ohms IC 1 = CD4017BE Relay 1,2,3 are 5 volts relay  TR1,2,3 are BD139 npn transistors led 1,2,3 = low power led red,green,blue C1 = 2.2 uf T1 = touch sensor

This circuit use 4.5 - 5 volts power supply, so you can use 3 AA battery, USB power, or 4 AA rechargeable battery as you need. Use power supply over 5 volts not make circuit broken but the relay must be changed to 12 volts power supply type and you must use 5 volts regulator for touch sensor module. 

All you need to do next is watching my video below

Combine 3 speakers to one amplifier

I saw a question in my Youtube video about how to combine speakers for one amplifier unit without making any damage to an amplifier. An speaker impedance must be match or higher than an amplifier manufacturer specification, if you use lower speaker impedance than an amplifier specification, your amplifier may end up damaged or make a fire when you play loud music.
A commercial amplifier can handle between 4 - 16 ohms speaker impedance and maybe lower to 2 ohms for car subwoofer amplifier. but in a question, he asked me how to combine 3 speakers @ 6 ohms load to one amplifier.

The simple solution is to make 3 separate amplifiers and share same input, but it makes the circuit more complicated and uses many electronic components. However, if connect all 3 speakers in series, it will make impedance equal to 18 ohms and it makes an amplifier output drop so much.

So, I use 2 speakers connect in parallel and series to other speakers like an image below

SP 1 and SP 2 impedance drop to 3 ohms beca…

5 watts amplifier TDA7056A wiring diagram

TDA 7056 A is an audio power amplifier IC that has 5 watts output power with 8 ohms speaker and 3 watts with 16 ohms speaker.The IC is simple to wiring and needs only 6 external components to make the amplifier working. TDA 7056A working with a power supply between 4.5 - 18 volts so the IC can use a battery as power supply. if you use more than 9 volts, you need to attach small heat sink to the IC.TDA7056A has a built-in DC volume control so you can control the gain of the amplifier by changing voltage value at DC volume control pin by use a potentiometer. DC volume control makes you connect the audio signal directly to the amplifier input so it makes a sound more transparent and cleaner than a normal amplifier. 
The IC has a short circuit protection, over temperature protection, No switch-on/off clicks, ESD protected on all pins, Mute mode (The IC switch mode when DC volume control pin voltage lower than 0.3 volts) 

TDA 7056A has a very wide audio bandwidth 20 Hz to 300 KHz (Hi-fi ampl…

How to remove scratch coating from mobile phone camera

Now a day a mobile phone camera lens cover coating with anti-glare, scratch resistance. However, every coating material can be scratched easily even the smartphone camera coating with scratch resistance material, and it makes the camera quality drop significantly. 
The best way to fix this problem is removing the scratches coating off the camera lens cover, but you need to remove it the right way or you may end up make more scratches to the camera lens cover.
My instruction is easy to do and make a pleasant result. All tool you need is old sim card adapter and car polishing(no rubbing bead type)
You may have a question in your mind that why I use sim card adapter as the rubbing tool. - The simple answer is a sim card adapter made of plastic that softer than commercial cell phone camera lens cover.
Please check the video below for the instruction and before and after comparison.

Awesome ideas with inner tire tube

Hello everyone, today I will show you how to save money with old inner tire tube. Next time when you change a tire tube to a new one, you should not put it in a bin ;) See the video below and see how it works.