LED Based message display
This LED-based message show is made around available, cheap components. It is possible to fabricate and utilizes 3mm red LEDs. A total of 172 LEDs have been arranged to display the message “HAPPY NEW YEAR 2004.”
The arrangement of LED1 through LED11 is employed to produce ‘H’ as shown in Fig. 1. The anodes of LED1 through LED11 are attached to point an and the cathodes among these LEDs tend to be attached to point B. likewise, letter ‘A’ is built making use of LED12 through LED21. All the anodes of LED12 through LED21 tend to be linked to aim A, even though the cathodes among these LEDs tend to be connected to resistor R8 (perhaps not shown when you look at the circuit drawing). Various other letters/words can also be quickly organized to make the necessary sentence.
The ability supply for message display circuit (Fig. 2) comprises a 0-9V, 2A step-down transformer (X1), bridge rectifier comprising diodes D1 through D4, and a filter capacitor (C1). IC 7806 (IC1) provides regulated 6V DC to the show circuit comprising timer 555 (IC2) and decade countertop CD4017 (IC3). The astable multivibrator built around IC2 produces 1Hz clock at its result pin 3. This result is linked to time clock pin (pin 14) of the ten years counter.
The ten years counter can total to 10. The production of IC3 advances by one matter every second (with respect to the period of time of astable multivibrator IC2).
When Q1 production of IC3 goes large, transistor T1 conducts and current flows through LED1 through LED48 via resistors R7 through R11. Today the word ‘HAPPY’ built around LED1 through LED48 is shown on Light-emitting Diode arrangement board.
After that, whenever Q2 output of IC3 goes high, transistor T2 conducts additionally the current flows through LED49 through LED87 via resistors R12 through R14. Now the term ‘NEW’ is presented on the Light-emitting Diode arrangement board.
Once more, when Q3 result goes large, transistor T3 conducts in addition to present flows through LED88 through LED128 via resistors R15 through R18. Now your message ‘YEAR’ is exhibited on the LED arrangement board.
Similarly, whenever Q4 production goes high, transistor T4 conducts therefore the current flows through LED129 through LED172 via resistors R19 through R22. Now digits ‘2004’ are shown from the LED arrangement board.
Throughout the whole duration when Q5, Q6, Q7, or Q8 result get high, transistor T5 conducts in addition to existing flows through all the LEDs via diodes D9 through D12 and resistors R7 through R22. Today the entire message “HAPPY NEW YEAR 2004” is displayed regarding LED arrangement for four seconds.
Therefore, the display board displays ‘HAPPY, ’ ‘NEW, ’ YEAR’ and ‘2004’ one after another for one second each. Next, the message “HAPPY NEW-YEAR 2004” is presented for 4 moments (because Q5 through Q8 are attached to resistor R6 via diodes D5 through D8).
At next time clock input output Q9 goes large, and IC3 is reset and show is turned off for starters second. Thereafter the pattern repeats.Past article“We are seeing interest in both reasonable- and high-end 32-bit MCUs”