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Output a true RMS voltage % (#3494)

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joseph douce 2022-05-24 01:52:54 +01:00 committed by GitHub
parent a8ceeaa7b0
commit 9dc804ee27
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1 changed files with 5 additions and 1 deletions
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esphome/components/ac_dimmer/ac_dimmer.cpp
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@ -121,7 +121,11 @@ void IRAM_ATTR HOT AcDimmerDataStore::gpio_intr() {
// calculate time until enable in µs: (1.0-value)*cycle_time, but with integer arithmetic
// also take into account min_power
auto min_us = this->cycle_time_us * this->min_power / 1000;
this->enable_time_us = std::max((uint32_t) 1, ((65535 - this->value) * (this->cycle_time_us - min_us)) / 65535);
// calculate required value to provide a true RMS voltage output
this->enable_time_us =
std::max((uint32_t) 1, (uint32_t)((65535 - (acos(1 - (2 * this->value / 65535.0)) / 3.14159 * 65535)) *
(this->cycle_time_us - min_us)) /
65535);
if (this->method == DIM_METHOD_LEADING_PULSE) {
// Minimum pulse time should be enough for the triac to trigger when it is close to the ZC zone
// this is for brightness near 99%