71 lines
1.8 KiB
C++
71 lines
1.8 KiB
C++
// Keyboard Matrix Tutorial Example
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// baldengineer.com
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// CC BY-SA 4.0
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// JP1 is an input
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byte rows[] = {16,17};
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const int rowCount = sizeof(rows)/sizeof(rows[0]);
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// JP2 and JP3 are outputs
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byte cols[] = {18, 2};
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const int colCount = sizeof(cols)/sizeof(cols[0]);
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byte keys[colCount][rowCount];
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void setup() {
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Serial.begin(9600);
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for(int x=0; x<rowCount; x++) {
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Serial.print(rows[x]); Serial.println(" as input");
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pinMode(rows[x], INPUT);
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}
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for (int x=0; x<colCount; x++) {
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Serial.print(cols[x]); Serial.println(" as input-pullup");
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pinMode(cols[x], INPUT_PULLUP);
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}
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}
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void readMatrix() {
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// iterate the columns
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for (int colIndex=0; colIndex < colCount; colIndex++) {
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// col: set to output to low
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byte curCol = cols[colIndex];
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pinMode(curCol, OUTPUT);
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digitalWrite(curCol, LOW);
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// row: interate through the rows
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for (int rowIndex=0; rowIndex < rowCount; rowIndex++) {
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byte rowCol = rows[rowIndex];
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pinMode(rowCol, INPUT_PULLUP);
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keys[colIndex][rowIndex] = digitalRead(rowCol);
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pinMode(rowCol, INPUT);
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}
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// disable the column
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pinMode(curCol, INPUT);
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}
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}
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void printMatrix() {
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for (int rowIndex=0; rowIndex < rowCount; rowIndex++) {
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if (rowIndex < 10)
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Serial.print(F("0"));
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Serial.print(rowIndex); Serial.print(F(": "));
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for (int colIndex=0; colIndex < colCount; colIndex++) {
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Serial.print(keys[colIndex][rowIndex]);
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if (colIndex < colCount)
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Serial.print(F(", "));
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}
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Serial.println("");
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}
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Serial.println("");
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}
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void loop() {
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readMatrix();
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printMatrix();
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delay(1000);
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}
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