ArduinoでビットカウンタをLEDと7セグでつくってみました。
4桁の7セグと、8個のLEDなので普通に作ってしまうと、PINが足らないので、4桁の高速切り替え表示や、シフトレジスタを使うところポイントです。
あと超音波センサで測った距離も表示しようと思いましたが、今回はログ表示にとどめておきたいと思います。
7セグは高速で4桁表示しているので、ディレイなどを使って処理が遅れると表示が乱れてしまいます。このあたり意外と難しいと思いました。
参考:http://osoyoo.com/ja/2014/12/06/arduino-starter-kit/
ここのチュートリアルはとても参考になります。今回はkumanのボードですが、osoyooは他のブログでも使っています。
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int latchPin = 17; //Pin connected to Pin 12 of 74HC595 (Latch) int dataPin = 18; //Pin connected to Pin 14 of 74HC595 (Data) int clockPin = 19; //Pin connected to Pin 11 of 74HC595 (Clock) long cnt = 100; int a = 13; int b = 2; int c = 3; int d = 4; int e = 5; int f = 6; int g = 7; int p = 8; int d4 = 9; int d3 = 10; int d2 = 11; int d1 = 12; int x = 100; long del = 4000; int Trig = 16; // ana2 int Echo = 15; // ana1 int Duration; float Distance; void setup() { pinMode(latchPin, OUTPUT); pinMode(clockPin, OUTPUT); pinMode(dataPin, OUTPUT); Serial.begin(9600); pinMode(d1, OUTPUT); pinMode(d2, OUTPUT); pinMode(d3, OUTPUT); pinMode(d4, OUTPUT); pinMode(a, OUTPUT); pinMode(b, OUTPUT); pinMode(c, OUTPUT); pinMode(d, OUTPUT); pinMode(e, OUTPUT); pinMode(f, OUTPUT); pinMode(g, OUTPUT); pinMode(p, OUTPUT); pinMode(Trig,OUTPUT); pinMode(Echo,INPUT); } long old = 0; void loop() { long c = cnt / 100; if(old != c){ digitalWrite(latchPin, LOW); shiftOut(0); digitalWrite(latchPin, HIGH); //set latchPin low to allow data flow digitalWrite(latchPin, LOW); shiftOut(c % 256); //set latchPin to high to lock and send data digitalWrite(latchPin, HIGH); digitalWrite(Trig,LOW); delayMicroseconds(1); digitalWrite(Trig,HIGH); delayMicroseconds(11); digitalWrite(Trig,LOW); Duration = pulseIn(Echo,HIGH); if (Duration>0) { Distance = Duration/2; Distance = Distance*340*100/1000000; // ultrasonic speed is 340m/s = 34000cm/s = 0.034cm/us Serial.print(Duration); Serial.print(" us "); Serial.print(Distance); Serial.println(" cm"); } } showNum(cnt); if(old != c){ old = c; Serial.println(c); } cnt += 1; } void shiftOut(byte dataOut) { // Shift out 8 bits LSB first, on rising edge of clock boolean pinState; digitalWrite(dataPin, LOW); //clear shift register ready for sending data digitalWrite(clockPin, LOW); for (int i=0; i<=7; i++) { // for each bit in dataOut send out a bit digitalWrite(clockPin, LOW); //set clockPin to LOW prior to sending bit // if the value of DataOut and (logical AND) a bitmask // are true, set pinState to 1 (HIGH) if ( dataOut & (1<<i) ) { Serial.print(i); pinState = HIGH; } else { pinState = LOW; } //sets dataPin to HIGH or LOW depending on pinState digitalWrite(dataPin, pinState); //send bit out on rising edge of clock digitalWrite(clockPin, HIGH); } Serial.println(""); digitalWrite(clockPin, LOW); //stop shifting out data } void showNum(long n) { clearLEDs(); pickDigit(1); pickNumber((n/x/1000)%10); delayMicroseconds(del); clearLEDs(); pickDigit(2); pickNumber((n/x/100)%10); delayMicroseconds(del); clearLEDs(); pickDigit(3); dispDec(3); pickNumber((n/x/10)%10); delayMicroseconds(del); clearLEDs(); pickDigit(4); pickNumber(n/x%10); delayMicroseconds(del); } void pickDigit(int x) { digitalWrite(d1, HIGH); digitalWrite(d2, HIGH); digitalWrite(d3, HIGH); digitalWrite(d4, HIGH); switch(x) { case 1: digitalWrite(d1, LOW); break; case 2: digitalWrite(d2, LOW); break; case 3: digitalWrite(d3, LOW); break; default: digitalWrite(d4, LOW); break; } } void pickNumber(int x) { switch(x) { default: zero(); break; case 1: one(); break; case 2: two(); break; case 3: three(); break; case 4: four(); break; case 5: five(); break; case 6: six(); break; case 7: seven(); break; case 8: eight(); break; case 9: nine(); break; } } void dispDec(int x) { digitalWrite(p, HIGH); } void clearLEDs() { digitalWrite(a, LOW); digitalWrite(b, LOW); digitalWrite(c, LOW); digitalWrite(d, LOW); digitalWrite(e, LOW); digitalWrite(f, LOW); digitalWrite(g, LOW); digitalWrite(p, LOW); } void zero() { digitalWrite(a, HIGH); digitalWrite(b, HIGH); digitalWrite(c, HIGH); digitalWrite(d, HIGH); digitalWrite(e, HIGH); digitalWrite(f, HIGH); digitalWrite(g, LOW); } void one() { digitalWrite(a, LOW); digitalWrite(b, HIGH); digitalWrite(c, HIGH); digitalWrite(d, LOW); digitalWrite(e, LOW); digitalWrite(f, LOW); digitalWrite(g, LOW); } void two() { digitalWrite(a, HIGH); digitalWrite(b, HIGH); digitalWrite(c, LOW); digitalWrite(d, HIGH); digitalWrite(e, HIGH); digitalWrite(f, LOW); digitalWrite(g, HIGH); } void three() { digitalWrite(a, HIGH); digitalWrite(b, HIGH); digitalWrite(c, HIGH); digitalWrite(d, HIGH); digitalWrite(e, LOW); digitalWrite(f, LOW); digitalWrite(g, HIGH); } void four() { digitalWrite(a, LOW); digitalWrite(b, HIGH); digitalWrite(c, HIGH); digitalWrite(d, LOW); digitalWrite(e, LOW); digitalWrite(f, HIGH); digitalWrite(g, HIGH); } void five() { digitalWrite(a, HIGH); digitalWrite(b, LOW); digitalWrite(c, HIGH); digitalWrite(d, HIGH); digitalWrite(e, LOW); digitalWrite(f, HIGH); digitalWrite(g, HIGH); } void six() { digitalWrite(a, HIGH); digitalWrite(b, LOW); digitalWrite(c, HIGH); digitalWrite(d, HIGH); digitalWrite(e, HIGH); digitalWrite(f, HIGH); digitalWrite(g, HIGH); } void seven() { digitalWrite(a, HIGH); digitalWrite(b, HIGH); digitalWrite(c, HIGH); digitalWrite(d, LOW); digitalWrite(e, LOW); digitalWrite(f, LOW); digitalWrite(g, LOW); } void eight() { digitalWrite(a, HIGH); digitalWrite(b, HIGH); digitalWrite(c, HIGH); digitalWrite(d, HIGH); digitalWrite(e, HIGH); digitalWrite(f, HIGH); digitalWrite(g, HIGH); } void nine() { digitalWrite(a, HIGH); digitalWrite(b, HIGH); digitalWrite(c, HIGH); digitalWrite(d, HIGH); digitalWrite(e, LOW); digitalWrite(f, HIGH); digitalWrite(g, HIGH); } |
“95”を表示
シリアルモニタ表示
別の角度から
Arudinoはドキュメントが豊富なので(kumanのキットにはCD-ROMが付属)、パーツの使い方を学ぶのに最適ですね。