forked from github/ebk_co2ampel
83 lines
1.9 KiB
C++
83 lines
1.9 KiB
C++
#include <Arduino.h>
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#include "MHZ19.h"
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#include "SSD1306Wire.h"
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#include <Adafruit_NeoPixel.h>
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#define RX_PIN 16
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#define TX_PIN 17
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#define BAUDRATE 9600
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MHZ19 myMHZ19;
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HardwareSerial mySerial(1);
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SSD1306Wire display(0x3c, 21, 22);
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// When we setup the NeoPixel library, we tell it how many pixels, and which pin to use to send signals.
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// Note that for older NeoPixel strips you might need to change the third parameter--see the strandtest
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Adafruit_NeoPixel pixels = Adafruit_NeoPixel(1, 4, NEO_GRB + NEO_KHZ800);
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unsigned long getDataTimer = 0;
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int lastvals[120];
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int dheight;
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void setup()
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{
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Serial.begin(9600);
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mySerial.begin(BAUDRATE, SERIAL_8N1, RX_PIN, TX_PIN);
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myMHZ19.begin(mySerial);
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display.init();
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display.setContrast(255);
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delay(1000);
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display.clear();
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dheight = display.getHeight();
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myMHZ19.autoCalibration();
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for (int x; x <= 119; x = x + 1) {
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lastvals[x] = -1;
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}
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pixels.begin(); // This initializes the NeoPixel library.
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pixels.setPixelColor(0, pixels.Color(255,0,0)); // Moderately bright green color.
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pixels.show();
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}
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int calc_vpos_for_co2(int co2val, int display_height) {
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return display_height - int((float(display_height) / 3000) * co2val);
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}
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void loop()
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{
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if (millis() - getDataTimer >= 5000)
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{
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int CO2;
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CO2 = myMHZ19.getCO2();
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for (int x = 1; x <= 119; x = x + 1) {
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lastvals[x - 1] = lastvals[x];
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}
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lastvals[119] = CO2;
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display.clear();
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for (int h = 1; h < 120; h = h + 1) {
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int curval = lastvals[h];
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if (curval > 0) {
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int vpos = calc_vpos_for_co2(lastvals[h], dheight);
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int vpos_last = calc_vpos_for_co2(lastvals[h - 1], dheight);
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display.drawLine(h - 1, vpos_last, h, vpos);
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}
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}
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display.setLogBuffer(5, 30);
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display.println(CO2);
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display.drawLogBuffer(0, 0);
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display.display();
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Serial.print("CO2 (ppm): ");
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Serial.println(CO2);
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getDataTimer = millis();
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}
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}
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