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A hobby hardware and logic design project that decodes Morse code input into discrete Dit (Dot) and Dah (Dash) shift register arrays using pure analog timing circuits and discrete digital logic, without requiring any microcontrollers.
This project implements a temporal-logic state machine to parse Morse code inputs. By measuring the duration of a button press using an RC charging network and Schmitt-trigger buffers, the circuit discriminates between short pulses (Dits) and long pulses (Dahs), shifting them into separate 8-bit serial-in, parallel-out shift registers to display the incoming character pattern visually via an LED array.
LED_Dual_AAK): Dual-color indicators displaying the shifted dot/dash sequences.
why are there floating CMOS inputs on U1? pins 11 and 13 I mean ChatGPT told me: Floating CMOS inputs can sit mid-rail, causing extra quiescent current draw and potential oscillation/noise coupling into the rest of the chip. Best practice is to tie unused inputs to GND or VCC even if the gate's output is unused.