Project 25: 4-Digit Led Segment Display - Keyestudio ARDUINO maker learning kit Manual

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delay(1000); // wait for 1s
}
}
//////////////////////////////////////////////////////////
Result
LED segment display displays number 0 to 9.
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Project 25: 4-digit LED segment display

Introduction
In this experiment, we use an Arduino to drive a common anode, 4-digit, 7-segment LED display.
For LED display, current-limiting resistors are indispensable. There are two wiring method
for Current-limiting resistor. One is to connect one resistor for each anode, 4 in totals for d1-d4
anode. An advantage for this method is that it requires fewer resistors, only 4. But it cannot
maintain consistent brightness, 1 the brightest, 8, the least bright. Another method is to connect
one resistor to each pin. It guarantees consistent brightness, but requires more resistors. In this
experiment, we use 8 220Ω resistors (we use 220Ω resistors because no 100Ω resistor available. If
you use 100Ω, the displaying will be brighter).
Circuit connection
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