14-08-2012, 12:35 PM
WATER LEVEL DETECTOR USING 8051 MICROCONTROLLER
WATER LEVEL DETECTOR .pptx (Size: 677.42 KB / Downloads: 312)
INTRODUCTION
Microcontroller based water level detector is a simple liquid level indicator.
This circuit works on the principle that water conducts electricity.
Initially when the tank is empty ,the display will show the message VACANT. As the tank starts filling up wire at different levels get some positive voltage, due to conducting nature of water. This voltage is then fed to their corresponding pins on controller. The displays are QUARTER,MIDDLE,FULL according to the positive voltage it gains.
Three criteria in Choosing a Microcontroller
meeting the computing needs of the task efficiently and cost effectively
speed, the amount of ROM and RAM, the number of I/O ports and timers, size, packaging, power consumption
easy to upgrade
cost per unit
availability of software development tools
assemblers, debuggers, C compilers, emulator, simulator, technical support
wide availability and reliable sources of the microcontrollers.
Sensors
A sensor (also called detector) is a device that measures a physical quantity and converts it into a signal which can be read by an observer or by an instrument.
Types of Sensors
Acoustic, sound, vibration
Automotive, transportation
Chemical
Electric current, electric potential, magnetic, radio
Environment, weather, moisture, humidity
Flow, fluid velocity
Position, angle, displacement, distance, speed, acceleration
Optical, light, imaging, photon
Pressure
Thermal, heat, temperature
Proximity, presence