The large LED display comes in handy for soccer or basketball competitions held in the school gym. It can be made by the students themselves, and after that it will serve more than one generation of schoolchildren.
Instructions
Step 1
As a blank, use a sheet of hardboard one meter high and two meters wide. Divide it with three vertical lines into four identical rectangles located in one horizontal row.
Step 2
Take an ordinary calculator and display the number 8. Transfer the picture you saw to the board in a greatly enlarged form. In total, you need to draw four such eights - one in each rectangle.
Step 3
Now arm yourself with a small drill. Install a drill into its chuck, the diameter of which is selected so that the LED can be tightly inserted into the resulting hole. Four diodes should be placed in each segment, they themselves can be of any color, but they must be super-bright.
Step 4
In series with each diode, turn on a 200 ohm, 0.5 W resistor. Connect such chains in parallel within one segment.
Step 5
In the middle of the scoreboard, between the second and third digits, install two sockets for bulbs of type E14 (mignon). Install 220 V, 15 W bulbs in them. Connect the cartridges in series, and then both bulbs will shine dimly, not standing out against the background of the LEDs with anything other than color. They will represent the colon between the score of one and the other team. Bulb bulbs should not touch hardboard.
Step 6
To power the LEDs, use the power supply from the computer (use the 5-volt output, observing the polarity), and to power the lamps - directly the lighting network. Do not connect the power supply circuits of diodes and light bulbs to each other at any point. On the control panel, place a thumbnail schematic of a display with toggle switches on each segment. There is no need to provide a toggle switch for the colon - it should be lit constantly while the display is plugged into the network. Make the control panel body of insulating material.
Step 7
Route a cable consisting of 29 conductors (48 segments and 1 common) between the control panel and the display. Apply voltage to the bulbs through a separate two-wire double-insulated cord. Place the scoreboard on the wall almost near the ceiling of the hall, and the console - on the judge's table.
