Have you ever wonder what type of sensor that you can use to sense for obstacle ? Well, in this post, I am going to explain a brief detail about using a HC-SR04 Ultrasonic Sensor for sensing obstacle.
The HC-SR04 sensor is using the sonar to determine the distance to an object like what you know about bats or dolphin. It comes complete with ultrasonic transmitter and recevier module.
Some features of the HC-SR04 ultrasonic sensor :
- Power supply : +5V DC
- Working current : 15mA
- Measuring angle : 30 degree
- Ranging distance : 2cm - 400cm
Datesheet HC-SR04
A very good video preview on ultrasonic sensor !
A DS1307 is a pretty simple , inexpensive and easy to use real time clock IC. This IC can count date and time accurately. Once the time and date is set, it will continue its counting if the power(backup battery) is there ! The backup battery ( coin cell battery) is there to keep the DS1307 counting operation if the main power supply is cut off.
Relay is an electrical operated switch that people
normally used when they want to control a higher voltage circuit from a
lower voltage circuit.
Current flowing through the coil of therelay creates a magnetic field which attracts a lever and changes the switch contacts.
