Question

We need a messaging mechanism to send messages to people who are on the other side of the river. The only resources we have are two switches and a message board. We can only send messages as binary sequences where one switch injects ' 1 ' and the other injects ' 0 '. Every four consecutive binaries form a letter. Every letter must be displayed three times by blinking it three times on the message board. The delay has to be two seconds for the people to realize the changes. We should be able to press the switches while the message board is sending the previous messages.

Example: We press "110111110011" as a sequence. As soon as we have pressed "1101" the message board should start displaying "1101", while receiving further inputs. The message board displays "1101" for two seconds then goes off for one second and keeps doing it three times. Then it will display the next sequence " 1111 " in similar fashion. Following sequences will be displayed in similar fashion.

how to implement a circuit that involves a 555 timer and a state machine

Answer 1

To implement a messaging mechanism using a circuit that involves a 555 timer and a state machine, you need to create a circuit that can receive and interpret binary sequences, and control the blinking of the message board with the desired delays.

Step-by-step explanation:

To implement a messaging mechanism using a circuit that involves a 555 timer and a state machine, you will need to create a circuit that can receive and interpret binary sequences, as well as control the blinking of the message board. Here is a general outline of how you can approach this:

1. Use the 555 timer as a clock signal generator to control the timing of the circuit. Set it up to generate a clock signal with a period of 2 seconds.
2. Connect the two switches to the circuit so that they can inject '1' and '0' signals into the circuit when pressed.
3. Implement a state machine that can receive the binary sequences and interpret them as letters. You can use a combination of logic gates and flip-flops to build the state machine.
4. Connect the output of the state machine to the message board. Use the output to control the blinking of the message board, with a delay of 2 seconds for each letter and 1 second of off time between letters.

By implementing this circuit, you will be able to send messages to people on the other side of the river by inputting binary sequences through the switches and having the message board display the messages in the desired format.