Today's session is 7-segment decoder. At the end of this session, student will be able to design a 7-segment decoder using 7447 IC. A 7-segment display is used to display decimal digit from 0 to 9 and hexadecimal numerals from 0 to F. A BCD to 7-segment decoder accepts a decimal digit in BCD and generate the corresponding 7-segment code. For example, in this slide we can see display of 7-segment decoder that is 757 it is displaying the number. As it is having 7-segment ABCDEFG and with the help of that format we can display any BCD number. For example, for displaying 0 only G will be off and for displaying 1 only B and C-segment will be on. Like this in 2 we are having AB, G, E and D. Now, while constructing this 7-segment display we need display circuit which will convert ABCD BCD number into the 7-segment. So here in 7447 IC we are having ABCD is BCD number where it is converted into the format of ABCDEFG that is 7-segment. That 7-segment will be provided to the display and that will display any BCD number. For this first step will be for truth table. In truth table we are having BCD number then output in the format of 7-segment and display. So in BCD number we are having ABCD and that number will be display over there. Now for 0 number all ABCD are 0 but in 7-segment only G is going to be off so ABCDEF all you can see here all are 1. For 1 as I said 1 we want only B and C should be 1 so B and C is 1 and remaining all segments are 0. So for 0 to 9 all segments are set at what number that should be on and what number that should be off. Accordingly we will go for designing its circuit. So this inputs will put in the first K-map. So for A we need that A-segment should be on for 0, 2, 3, 5, 7, 8 and 9. So accordingly we have put that 0th value then 2 value 3 value 5, 7, 8 and 9. So total 10 numbers are there and remaining 5 numbers we have put don't care. After simplification we are getting A-segment is having circuit ray A plus CD plus BD plus B-bar D-bar. So we have constructed this circuit for them. For B we are having simplified K-map is B-bar plus C-bar D-bar plus CD. So this is the circuit diagram. And as we have seen that C-segment in the truth table we are having all 1 only when 2 number is there that time it is 0. So accordingly at 2 place it is 0 and all other place that number segment is on. So after simplification only 3 input NAND gate is there and inputs are BCD. So for D, E and F again using that same criteria we have formed this K-map and the circuitry. This is for G. Now we will see one example how 7-segment decoder works and in that one segment how it works for all BCD numbers. So here ABCD that is the BCD number it will go through the 0 to 9. Then we will feel that K-map here we can see that at what position it should be on we have put 1 and other position we have put 0s. And wherever there is no 0 and 1 we are having don't care. So after simplification of this segment E we are having grouping format. So here there is no 8 group so we are doing the group of 4. So this is the group of 4 1 1 don't care and don't care. So this all a bar b bar a bar b a b and a b bar will be cancelled to each other. Only it will remain C and D bar so we are wrote here C and D bar. And remaining ones will cover into this corner group. So it will be giving us output is simplification output is b bar d bar. So for E we are having circuitry b bar d bar plus C d bar. So we are forming this circuitry for this segment E. So here b bar and d bar for this NAND gate we are having b bar through this inverter and d bar through the second inverter. And for C d bar we are having C directly from BCD input and D is coming with this inverter. Now when it will be on and when it will be off we will see one example. So when we are displaying number 2 that time E segment should be on. So BCD number 2 0 0 1 0. So we will see that how that will be input. So 0 is inverted it will be 1 then next 0 is inverted it will be 1. So b d bar is equal to 1 and C is 1 and D bar is 1. So output of this will be 1 and 1 so oring is 1. So automatically when 2 BCD input is there our output E will be on. In this second example when E segment should be off we will see that the BCD input is 0 0 1. So input 1 it is inverted so output is 0 here 0 is input from BCD to C so output is 0. So that both inputs 0 are going to be output 0 so E segment will be off. So have you seen any 7 segment application pause for 2 seconds and think about this. So we are having many examples of this 7 segment application is digital calculator, electronic meters, then digital clocks, odometer, clock radios and bank token displays. So these are references thank you.


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please the floor is yours. Hello. Thank you very much Darren. And thank you for the organizer to see that a slum dweller can come and say what he thinks about the problem of Daravi. I think just now you saw everything. I think the whole globe might be hearing everything about Daravi. Not the people of Daravi. Not the single person in Daravi go to any media. Ask him what about Daravi? We need to know. That's what it is. Government doesn't know. The bureaucracy doesn't know. The people living there for 40 years doesn't know where is ours going to be housed in which corner. This won't be a design. Today in the 20th century we are talking up. The whole globe is talking about bottom-up approach. Here is top-down approach. Five years somebody is working in Daravi and doesn't know what is happening about Daravi. You heard very recently. I think I don't know what way Mr. Chhatriya influenced the Daravi project to introduce a survey. You see first time in the world a global tender has been invited. Bidder has been called without any statistics. Now they're going to do the survey. Just announced about a month back. What a beautiful project it is. What a beautiful participation is it. What is the way of consultancy it has done. You see in the newspaper you can hear everything in the newspaper. Statistics given. No mention about what happened to the RAC pickers. What happened to the Idli Valas. Idli is sold in Kulaba in the Sair airport but is produced more than half a million Idlis produce every day. What is going to happen to them. This is the poor man's food. What urban development you are talking about. I remember about 25 years back the ex-prime minister Rajiv Gandhi has appointed a commission called Charles Corriya committee. The great developer who's proposing this development has looked at it. In that time in 25 years back it Mr. Charles Corriya wrote Daravi is a saucer. It cannot be developed like that. You need to have a people's participation. In this project is people participation has been bulldozed. Thank God. Nasir Munji is very clearly said we have forgot bulldozer 20 years back but bulldozer coming through MM consultant. Very well. Very well practically designed. What is happening. What are you talking about. Does the people know about today if you go to builder development 750 rupees is the outgoing every month. Does MM consultants know about it. How much you're going to charge. What are you going to charge. The whole Daravi is vibrant today because it's vibrant economy. 3 to 5 crore rupees a generation of every day turnover. Where is the place for the people. What is going to happen to all its economic activities. Now you are doing a very big favor taking the slum and selling it to a developer and giving back the slum improvement.  Today you open the newspaper it talks about economics booming. The poor is going deep down. You are making it to happen. Just to improve a slum project you are selling slum dollars land. Fine. Okay. That is also acceptable. In the project is very well conceived. The TDR, the FSI for SRA is 2.5. In Daravi special case 4 FSI. What is the concentration given to Daravi resident. 225 in SRA for everybody. Anybody in Bombay who comes under SRA they go get 225. Your builder is getting 4 FSI. What is the concentration specially designed in this project. Nothing. Same water tap. Same. No bedroom. Everybody in one room. And the builders are very good people in India. The minute you give it to the builder they give one hall, one corner, one bathroom and toilet. If anybody walks they can see the naked dance. No women can go there to dress up. There's somebody passerby also can see. That is what the scene. That is what the developer is going to give. Look at what is it. When you ask about it they say we are going to give you health. You saw the