Option to prevent 100% PWM output

README.md

@@ -112,6 +112,8 @@ Here is the list of supported hardware. For more information please refer to the
 |![EXS Wifi Relay v3.1](images/devices/exs-wifi-relay-v31.jpg)|||
 |**EXS Wifi Relay v3.1**|||
 
+**Other supported boards:** Itead Sonoff LED, Huacanxing H802, WiOn 50055, ManCaveMade ESP-Live, InterMitTech QuinLED 2.6, Arilux AL-LC06, Xenon SM-PW702U, Authometion LYT8266.
+
 ## License
 
 Copyright (C) 2016-2017 by Xose Pérez (@xoseperez)

code/espurna/config/general.h

@@ -491,9 +491,23 @@ PROGMEM const char* const custom_reset_string[] = {
 #endif
 
 #define LIGHT_SAVE_DELAY        5           // Persist color after 5 seconds to avoid wearing out
+
+#ifndef LIGHT_PWM_FREQUENCY
 #define LIGHT_PWM_FREQUENCY     1000        // PWM frequency
+#endif
+
+#ifndef LIGHT_MAX_PWM
 #define LIGHT_MAX_PWM           4095        // Maximum PWM value
+#endif
+
+#ifndef LIGHT_LIMIT_PWM
+#define LIGHT_LIMIT_PWM         LIGHT_MAX_PWM   // Limit PWM to this value (prevent 100% power)
+#endif
+
+#ifndef LIGHT_MAX_VALUE
 #define LIGHT_MAX_VALUE         255         // Maximum light value
+#endif
+
 #define LIGHT_MAX_BRIGHTNESS    255         // Maximun brightness value
 #define LIGHT_USE_COLOR         1           // Use 3 first channels as RGB
 #define LIGHT_USE_WHITE         0           // Use white channel whenever RGB have the same value

code/espurna/light.ino

@@ -197,8 +197,8 @@ void _fromMireds(unsigned long mireds) {
 unsigned int _toPWM(unsigned long value, bool bright, bool gamma, bool reverse) {
     value = constrain(value, 0, LIGHT_MAX_VALUE);
     if (bright) value *= ((float) _brightness / LIGHT_MAX_BRIGHTNESS);
-    unsigned int pwm = gamma ? gamma_table[value] : map(value, 0, LIGHT_MAX_VALUE, 0, LIGHT_MAX_PWM);
-    if (reverse) pwm = LIGHT_MAX_PWM - pwm;
+    unsigned int pwm = gamma ? gamma_table[value] : map(value, 0, LIGHT_MAX_VALUE, 0, LIGHT_LIMIT_PWM);
+    if (reverse) pwm = LIGHT_LIMIT_PWM - pwm;
     return pwm;
 }