Domestic And Industrial

Posted on Feb 6, 2014

This is a simple and inexpensive clap operated switch, which uses only four transistors and resistor/capacitor network. The name of the project itself suggests its application. It can be used for level control in hydroculture project. Also for kitchen purpose like detecting the level of water in washing machine. The main feature of this circuit is that it shows

Domestic And Industrial
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each level in meaningful English letters. It displays letter E` for Empty, `L` for Low, `H` for Half, `A` for Above Average and F` for Full Tank. The sensors for each level are immersed in tank. Their other ends get interconnected through four NOR gates, which uses IC1. The output is then given to IC2, which is BCD to seven- segment display driver IC. The level of fluid is indicated on 7- segment display. As shown in the circuit diagram, according to the level of liquid in tank, IC1 triggers each NOR gate. The output of each NOR gate in IC1 is applied to BCD input of IC2. When tank is low, the logic of four NOR gates in IC1 gives BCD logic as 1010. Their logics are applied to BCD inputs of IC2. Hence IC2 drives 7- segment display according to the BCD Code present at inputs. For low level BCD logic is 1010`. For this logic, display will indicate L`. As the level increases, BCD logic changes, and display will indicate accordingly. That is H` for half and A` for above average. You can see the code generation table or logic table. Note that there is no display pattern like E` or F` available from IC2. Therefore to obtain these pattern transistors T1 and T2 are used. These transistors blank out the unnecessary segments from 7- segment display. It can be seen that the letter `E` is generated by blanking b` and c` segments while it decodes digit 8`. Letter F` is obtained by blanking segment b` while it decodes letter P`. This...

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