79 lines
2 KiB
C++
79 lines
2 KiB
C++
// Form with proportional font.
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#include <Wire.h>
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#include "SSD1306Ascii.h"
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#include "SSD1306AsciiWire.h"
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// 0X3C+SA0 - 0x3C or 0x3D
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#define I2C_ADDRESS 0x3C
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// Define proper RST_PIN if required.
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#define RST_PIN -1
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SSD1306AsciiWire oled;
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uint8_t col0 = 0; // First value column
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uint8_t col1 = 0; // Last value column.
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uint8_t rows; // Rows per line.
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//------------------------------------------------------------------------------
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void setup() {
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const char* label[] = {"Voltage:", "Load:", "Runtime:"};
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const char* units[] = {"volts", "watts", "mins"};
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Wire.begin();
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Wire.setClock(400000L);
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#if RST_PIN >= 0
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oled.begin(&Adafruit128x64, I2C_ADDRESS, RST_PIN);
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#else // RST_PIN >= 0
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oled.begin(&Adafruit128x64, I2C_ADDRESS);
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#endif // RST_PIN >= 0
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oled.setFont(Callibri15);
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// oled.setFont(Arial14);
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// oled.setFont(Callibri11_bold);
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// oled.setFont(TimesNewRoman13);
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// Increase space between letters.
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oled.setLetterSpacing(2);
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oled.clear();
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// Setup form and find longest label.
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for (uint8_t i = 0; i < 3; i++) {
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oled.println(label[i]);
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uint8_t w = oled.strWidth(label[i]);
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col0 = col0 < w ? w : col0;
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}
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// Three pixels after label.
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col0 += 3;
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// Allow two or more pixels after value.
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col1 = col0 + oled.strWidth("99.9") + 2;
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// Line height in rows.
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rows = oled.fontRows();
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// Print units.
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for ( uint8_t i = 0; i < 3; i++) {
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oled.setCursor(col1 + 1, i*rows);
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oled.print(units[i]);
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}
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delay(3000);
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}
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//------------------------------------------------------------------------------
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void clearValue(uint8_t row) {
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oled.clear(col0, col1, row, row + rows - 1);
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}
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//------------------------------------------------------------------------------
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void loop() {
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// Fake system model.
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double volts = 0.1*random(110, 130);
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double watts = 0.1*random(200, 500);
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// 100 Wh battery.
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int run = 100*60/(int)watts;
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clearValue(0);
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oled.print(volts, 1);
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clearValue(rows);
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oled.print(watts, 1);
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clearValue(2*rows);
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oled.print(run);
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delay(1000);
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}
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