Basic Electronics/Electrical Projects & Kits

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Numeric Water Level Indicator with Display Save Rs. 75.00

Numeric Water Level Indicator with Display

by KNS Pvt Ltd
Save Rs. 75.00
Rs. 300.00
Rs. 225.00

Summary

Most water level indicators are equipped to indicate and detect only a single level. The Numeric Water Level Indicator implemented here can indicate up to nine such levels and displays the level no. on a seven segment display. Hence, not only is the circuit capable of cautioning a person that the water tank has been filled up to a particular level, it can also indicate that the water level has fallen below the minimum level.

This is particularly important in appliances such as the desert cooler where there is a danger of motor-burnout when the water is used up. This circuit exploits the simple fact that water is a good conductor of electricity. The placement of nine probes (having connections to the circuit) at different heights inside the water tank determines the nine different detectable levels. When the water reaches a particular height in the tank; the seven segment display shows the corresponding level no., digit 9 representing the “tank full” condition and digit 0 representing the “tank empty” condition.

Learning

Things which you can learn:


*Application of the Priority Encoder IC 74HC147
*Application of the BCD to Seven Segment Decoder IC CD4511 (for driving seven segment displays).

Product Description

The Numeric Water Level Indicator employs a simple mechanism to detect and indicate the water level in a tank or any other container. The level sensing is done by a set of nine probes which are placed at nine different levels on the tank walls (with probe9 to probe1 placed in decreasing order of height, COM probe is placed on the base of the tank). Basically, level9 represents the “tank full” condition while COM represents the “tank empty” condition.

Working

When the tank is empty, all the inputs to the priority encoder 74HC147 (IC1) remain high, as a result its output also remains high. Since these outputs are inverted and fed as inputs to the decoder driver CD4511 (IC2), all inputs to IC2 are low.

The seven segment display correspondingly shows the digit 0, indicating that the tank is empty.

When the water reaches level1 (but is below level2), pin11 (A0) of IC1 is pulled to ground and the output generated at pin9 (Y0) of IC1 also becomes low. After inversion, the bits fed to the input pins of IC2 are 0001 (DCBA). Hence, the corresponding digit displayed by the seven segment display is 1. The similar mechanism applies to the detection of all the other levels.
When the tank is finally full, all inputs to IC1 become low and all its outputs also go low. This causes all the inputs to IC2 to go high and hence the display shows a 9, thereby indicating a “tank full” condition.

 

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Fastest Finger First Indicator Save Rs. 25.00
Rs. 400.00
Rs. 375.00

Fastest Finger First Indicator

Fastest Finger First Indicator

by KNS Pvt Ltd
Save Rs. 25.00
Rs. 400.00
Rs. 375.00

Summary

Build a Fastest Finger First Indicator with this simple kit interactive and use it in a quiz and game shows for indicating which player reacted or answered the fastest. The number assigned to the player is displayed by the circuit along with an alarm sound while the fastest finger buttons of the other contestant are locked.

Learning

Things Which you will Learn :

*Basics and implementation of Priority Encoder IC 7475.
*Concept and implementation of Latch
*Basics and implementation of hex inverter gates with IC 74LS04
*Concept of Binary Coded Decimal and BCD to 7 segment display IC 7447
*Concept and implementation of Frequency oscillator with NE555 IC

Product Description

The Fastest Finger First Indicator circuit determines as to which of the four contestants pressed the button first and locks out the entries from the remaining three contestants. Simultaneously, an audio alarm and the correct decimal number display of the corresponding contestant are activated.

Working


When a contestant presses his switch, the corresponding output of the latch IC 7475(IC2) changes its logic state from 1 to 0. The combinational circuitry comprising dual 4-input NAND gates of 7420 (IC3) locks out subsequent entries by producing the appropriate latch-disable signal. Priority encoder IC 74147(IC4) encodes the active-low input condition into the corresponding binary coded decimal (BCD) number output. The outputs of IC4 after inversion by inverter gates inside hex inverter 74LS04 (IC5) are coupled to BCD-to-7-segment decoder/display driver 7447(IC6). The output of IC6 drives common common-anode 7-segment LED display (DIS.1, FND507 or LT543).

The audio alarm generator comprises of the frequency oscillator NE555 (IC7), whose output drives a loudspeaker. The oscillator frequency can be varied with the help of preset VR1. Logic 0 state at one of the outputs of IC2 produces logic 1 input condition at pin 4 of IC7, thereby enabling the audio oscillator.
IC7 needs +12V DC supply for sufficient alarm level. The remaining circuit operates on regulated +5V DC supply, which is obtained using IC1 (7805). Once the organizer identifies the contestant who pressed the switch first, he disables the audio alarm and at the same time forces the digital display to ‘0’ by pressing reset push button S5.

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RTC Based Time Operated Electrical Appliances Save Rs. 400.00

RTC Based Time Operated Electrical Appliances

by KNS Pvt Ltd
Save Rs. 400.00
Rs. 4,000.00
Rs. 3,600.00

Product Description

Power Saving Using Time Operated Electrical Appliance Controlling System is a reliable circuit that takes over the task of switch on/off the electrical devices with respect to time. This project replaces the Manual Switching. It has an Inbuilt Real Time Clock which tracks over the Real Time. When this time equals to the programmed time, then the corresponding Relay for the device is switched ON. The switching time can be edited at any Time using the keypad. The Real Time Clock is displayed on four 7-segment display.

Brand: HBeonLabs, Product assembled by HBeonLabs

 

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