Temperature on seven segment display using LM35 and arduino uno

We had already seen the circuit to measure the temperature using LM35 and arduino in one of my previous blog. Here, we will see the video demonstration of working of LM35 using arduino uno. Temperature measured will be displayed in a 5 digit seven segment display. Here, we are bringing a hot soldering iron near LM35 to increase the temperature around LM35.

Watch the video demonstration here.

Simple LDR Circuit Designed using ULN2803

We all are familiar with light dependent resistor (LDR) which is widely used in many applications like cars, street lights etc. Many ways are there by which we can interface light dependent resistors. Here, we will see a simple circuit for interfacing light dependent resistors using ULN2803 chip. ULN2803 is a high voltage / high current darlington driver comprised of eight NPN darlington pairs.

Video demonstration of working of a light dependent resistor using ULN2803 is given below.

By making proper changes in circuit, we can reverse the working of circuit.

Easy Way to Make Slow Motion Videos using Kdenlive 0.9.6 in Ubuntu 14.04

Slow motion frames sometimes increase the beauty of your videos. Many software are there which helps us to make slow motion videos. I am an ubuntu user and searched for a suitable software to make slow motion videos. After a few searching, I got a method to make slow motion videos easily using kdenlive software in ubuntu. Watch the following video to make slow motion videos using kdenlive.

Step by step procedures for making a simple music system using BT66T / UM66

We had already seen the circuit for making 'Jingle Bell' music using BT66T / UM66 in one of my previous blog. But, some of the beginners in electronic circuits may get confused a bit while doing the circuit. Here, we will see the step by step explanation of the procedures for making a simple music system using BT66T / UM66. Circuit require six simple components. They are

• a 10 K resistor
• a Press button switch
• a speaker (I am using a 4 Ohm, 3 Watts speaker)
• a BT66T  -  Music IC
• a 2SC9013  - Transistor

Circuit is done on a breadboard. Watch the following video demonstration to get the steps for completing the circuit.

'Jingle Bells' music generated using BT66T / UM66

BT66T is a simple IC which can be used to generate different melody musics. They are manufactured in different modes. Each mode is specific for a particular melody. One I purchased is specific for 'jingle bells'. Circuit for BT66T is simple and is done in my previous blog. Here, we will see the video demonstration of the same.

Police siren, ambulance siren, fire engine siren and machine gun sound using UM3561

Siren generation is an interesting task for electronic beginners. Sirens are very important in our daily life for giving signals and warnings. Many ICs are available in markets to make our favorite sirens. A simple IC which helps us to make four sirens is UM3561. By using two select inputs, we can generate four sirens. They are police siren, ambulance siren, fire engine siren and machine gun sound. We had already seen the circuit to generate sirens using UM3561 in my previous blog. Here, we will see the video demonstration of the same.

Block Diagram to Control Devices from Remote area through Mobile Phone

We had seen devices which are controlled using mobile phone from a remote area. Remote area means, from anywhere in the world. It will be interesting, if you can control your lamp or fan from another place or country by pressing different keys on mobile phone. Here, we will see the block diagram and video demonstration of a simple circuit which can be used to control your household devices from a remote area. Block Diagram of system is given below.

• Take two mobile phones and connect one phone (receiver phone) to "key identification and controlling circuit" through an audio jack.
• Take second mobile phone (controller phone) and call to the receiver phone.
• When the receiver phone rings, accept call.
• Now, call will be in progress between controller and receiver mobile phones. Take the keypad in controller mobile phone and press numbers. Number pressed in the controller phone will be read by the "key identification and controlling circuit". Controlling device can be controlled as per your wish using "key identification and controlling circuit" based on the number read from controller phone. "Key identification and controlling circuit" is given in my next blog.

Watch the video demonstration here.