Added a TimeEffect to show a countdown to a time given via MQTT.

src/effect_timer.cpp

@@ -0,0 +1,37 @@
+#include "effect_timer.h"
+#include <FastLED.h>
+#include "functions.h"
+#include "fonts.h"
+#include "ntp.h"
+
+void TimerEffect::loop(uint16_t ms) {
+	if (timer==0) return;
+
+	CRGB bg_color(0x000000);
+	CRGB fg_color(0xCCCCCC);
+	unsigned long now = ntpClient.getEpochTime() - NTP_OFFSET;
+	long diff = timer - now;
+	window->clear(&bg_color);
+	if (diff < 0 && (now & 1)==0) return;
+	if (diff < 0) diff = 0;
+	int hours = diff / 3600;
+	int minutes = diff / 60;
+	int seconds = diff % 60;
+	if (minutes > 99) {
+		seconds = minutes % 60;
+		minutes = hours;
+	}
+	//void drawChar(Font f, uint8_t x, uint8_t y, const char c, CRGB* color, bool mask=false);
+	window->drawChar(&font_numbers3x5, 0<<8,  0<<8, '0' + (minutes / 10), &fg_color);
+	window->drawChar(&font_numbers3x5, 4<<8,  0<<8, '0' + (minutes % 10), &fg_color);
+	window->drawChar(&font_numbers3x5, 9<<8,  0<<8, '0' + (seconds / 10), &fg_color);
+	window->drawChar(&font_numbers3x5, 13<<8, 0<<8, '0' + (seconds % 10), &fg_color);
+	if (now & 1) {
+		window->setPixel(7, 1, &fg_color);
+		window->setPixel(7, 3, &fg_color);
+	}
+}
+
+TimerEffect::~TimerEffect() {
+	delete window;
+}

src/effects.cpp

@@ -28,6 +28,7 @@
 Effect* current_effect;
 
 ClockEffect effect_clock;
+TimerEffect effect_timer;
 
 // We're using 0 instead of false to get a better visual difference between true and false.
 const EffectEntry effects[] = {

src/mqtt.cpp

@@ -50,6 +50,10 @@ void mqtt_callback(char* original_topic, byte* pl, unsigned int length) {
 			LOGln("Set weather_temperatures[%d] to value %d", id, val);
 		}
 		return;
+	} else if (topic.equals(MQTT_TOPIC_TIMER)) {
+		timer = payload.toInt();
+		LOGln("Set timer to %lu.", timer);
+		return;
 	}
 
 	topic.remove(0, strlen(MQTT_TOPIC)); // Strip MQTT_TOPIC from the beginning
@@ -102,6 +106,7 @@ boolean mqtt_connect() {
 		mqtt_client.publish(MQTT_TOPIC "status", buffer, true);
 		mqtt_client.subscribe(MQTT_TOPIC "+");
 		mqtt_client.subscribe(MQTT_TOPIC_WEATHER "#");
+		mqtt_client.subscribe(MQTT_TOPIC_TIMER);
 	}
 	return mqtt_client.connected();
 }

src/pitrix.cpp

@@ -19,6 +19,7 @@ uint8_t baseHue = 0; // defined as extern in prototypes.h
 char hostname[30]; // defined as extern in prototypes.h
 uint16_t frame = 0; // defined as extern in prototypes.h
 unsigned long _last_effect_loop_finished_at = 0;
+unsigned long timer = 0;
 #ifdef RECORDER_ENABLE
 Recorder* recorder;
 #endif
@@ -113,6 +114,9 @@ void loop() {
         if (current_effect->can_be_shown_with_clock()) {
             effect_clock.loop_with_invert(current_effect->clock_as_mask());
         }
+
+        effect_timer.loop(last_loop_ago);
+        
         FastLED.show();
         
         http_server_send_framedata();