132 lines
3.4 KiB
C++
132 lines
3.4 KiB
C++
#include <WiFi.h>
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#include <NeoPixelBus.h>
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#include <NeoPixelSegmentBus.h>
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#include <NeoPixelAnimator.h>
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#include <NeoPixelBrightnessBus.h>
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#include <MQTTPubSubClient.h>
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#include "config.h"
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// Only for ESP8266 D1 Mini
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#define ECHO 5 // D1
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#define TRIG 16 // D0
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#define POTI_IN 17 // A0, analog In
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WiFiClient client;
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MQTTPubSubClient mqtt;
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// Set Data pin for LED ring (we use GPIO3, which is also RX of the serial line)
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#define DATA_PIN 3
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const uint16_t PixelCount = 8;
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NeoPixelBus<NeoGrbFeature, NeoEsp8266Dma800KbpsMethod> strip(PixelCount, DATA_PIN);
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long duration; // here we measure the time needed by the ultrasonic pulse
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float distance; // the calculated distance
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int poti; // used to adjust the distance for yellow/red
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int percent=0; // will be used to calculate the current percentage of the distance reached
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int colorSaturation=255; // max color saturation for the colors (=brightness)
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// define some colors we use later
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RgbColor red(colorSaturation, 0, 0);
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RgbColor green(0, colorSaturation, 0);
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RgbColor yellow(colorSaturation, colorSaturation, 0);
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RgbColor blue(0, 0, colorSaturation);
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RgbColor white(colorSaturation);
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RgbColor black(0);
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void setup() {
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// start your network
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WiFi.begin(wifi_ssid, wifi_password);
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// connect to host
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client.connect(mqtt_server, 1883);
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// initialize mqtt client
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mqtt.begin(client);
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// connect to mqtt broker
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mqtt.connect("arduino", "public", "public");
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// subscribe topic and callback which is called when /hello has come
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mqtt.subscribe("/hello", [](const String& payload, const size_t size) {
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Serial.print("/hello ");
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Serial.println(payload);
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});
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// Setup the ultrasonic sensor PIN
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pinMode(TRIG, OUTPUT); // TRIG-Pin: Output
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pinMode(ECHO, INPUT); // ECHO-Pin: Input
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// Important to first initilizate Serial before the strip as
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// we are useing the RX PIN to connect the strip
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Serial.begin(9600); // Baudrate: 115200
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// this resets all the neopixels to an off state
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strip.Begin();
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for(int i=0; i<PixelCount; i++) {strip.SetPixelColor(i, red);}
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strip.Show();
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}
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void setColor(RgbColor c) {
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for(int i=0; i<PixelCount; i++) {
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strip.SetPixelColor(i, c);
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}
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strip.Show();
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}
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void setRed() {
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setColor(red);
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}
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void setYellow() {
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setColor(yellow);
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}
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void setGreen() {
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setColor(green);
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}
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void loop() {
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// Read poti (Value range 16 - 1024)
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poti=analogRead(POTI_IN);
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// Measure Distance
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digitalWrite(TRIG, LOW); delayMicroseconds(2);
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// TRIG-Pin ist HIGH für 10 Microsekunden
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digitalWrite(TRIG, HIGH);
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delayMicroseconds(10);
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digitalWrite(TRIG, LOW);
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// Liest das ECHO aus und speichert die Zeit von Senden / Empfangen in Microsekunden
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duration = pulseIn(ECHO, HIGH);
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// Berechnung der Entfernung
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// Da der Weg doppel ist: Hinweg - Rückweg, muss der Wert durch 2 geteilt werden
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distance = duration * 0.034 / 2;
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// Set color depending on poti
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// We assume poti value/20 (resulting in range <1,5 cm - 100cm)
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// Green if we are more than 50% above goal, yellow below 50% of goal, red at or below goal
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percent=distance/((float)poti/10)*100;
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if (percent >150) { setGreen(); }
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else if (percent >100) { setYellow(); }
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else {setRed(); }
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// Anzeige der Entfernung im seriellen Monitor
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#ifdef DEBUG
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Serial.println("Poti: " + String(poti));
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Serial.println("Entfernung: " + String(distance) + "cm");
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Serial.println("Percent: " + String(percent) + " of goal value");
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#endif
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delay(100);
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}
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