add fade from-to example

README.md

@@ -545,6 +545,8 @@ Example sketches are provided in the [examples](examples/) directory.
 * [Candle effect](examples/candle)
 * [Fade LED on](examples/fade_on)
 * [Fade LED off](examples/fade_off)
+* [Fade from-to effect](examples/fade_from_to)
+* [Pulse effect](examples/pulse)
 * [Controlling multiple LEDs in parallel](examples/multiled)
 * [Controlling multiple LEDs in parallel (mbed)](examples/multiled_mbed)
 * [Controlling multiple LEDs sequentially](examples/sequence)

examples/fade_from_to/fade_from_to.ino

@@ -0,0 +1,23 @@
+// JLed fade from-to example. Example randomly fades to a new level with
+// and duration, choosing random values.
+// Copyright 2022 by Jan Delgado. All rights reserved.
+// https://github.com/jandelgado/jled
+#include <jled.h>
+
+auto led = JLed(5).On(1);  // start with LED turned on
+
+void setup() {}
+
+void loop() {
+    static uint8_t last_to = 255;
+
+    if (!led.Update()) {
+        // when effect is done (Update() returns false),
+        // reconfigure fade effect using random values
+        auto new_from = last_to;
+        auto new_to = jled::rand8();
+        auto duration = 250 + jled::rand8() * 4;
+        last_to = new_to;
+        led.Fade(new_from, new_to, duration).Repeat(1);
+    }
+}

platformio.ini

@@ -33,7 +33,8 @@ default_envs = esp32
 ;src_dir = examples/user_func
 ;src_dir = examples/sequence
 ;src_dir = examples/custom_hal
-src_dir = examples/pulse
+;src_dir = examples/pulse
+src_dir = examples/fade_from_to
 
 [env:nanoatmega328]
 platform = atmelavr