UM Battery: basic support for LiPo cells
* Lipo cells (1S) should not be discharged below 3V * LiPo cells have a different voltage/discharge rate curve
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@ -18,7 +18,12 @@
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// https://batterybro.com/blogs/18650-wholesale-battery-reviews/18852515-when-to-recycle-18650-batteries-and-how-to-start-a-collection-center-in-your-vape-shop
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// Discharge voltage: 2.5 volt + .1 for personal safety
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#ifndef USERMOD_BATTERY_MIN_VOLTAGE
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#define USERMOD_BATTERY_MIN_VOLTAGE 2.6f
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#ifdef USERMOD_BATTERY_USE_LIPO
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// LiPo "1S" Batteries should not be dischared below 3V !!
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#define USERMOD_BATTERY_MIN_VOLTAGE 3.2f
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#else
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#define USERMOD_BATTERY_MIN_VOLTAGE 2.6f
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#endif
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#endif
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#ifndef USERMOD_BATTERY_MAX_VOLTAGE
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@ -36,6 +36,7 @@ define `USERMOD_BATTERY` in `wled00/my_config.h`
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| Name | Unit | Description |
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| ----------------------------------------------- | ----------- |-------------------------------------------------------------------------------------- |
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| `USERMOD_BATTERY` | | define this (in `my_config.h`) to have this usermod included wled00\usermods_list.cpp |
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| `USERMOD_BATTERY_USE_LIPO` | | define this (in `my_config.h`) if you use LiPo rechargeables (1S) |
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| `USERMOD_BATTERY_MEASUREMENT_PIN` | | defaults to A0 on ESP8266 and GPIO35 on ESP32 |
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| `USERMOD_BATTERY_MEASUREMENT_INTERVAL` | ms | battery check interval. defaults to 30 seconds |
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| `USERMOD_BATTERY_MIN_VOLTAGE` | v | minimum battery voltage. default is 2.6 (18650 battery standard) |
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@ -81,6 +82,7 @@ Specification from: [Molicel INR18650-M35A, 3500mAh 10A Lithium-ion battery, 3.
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2023-01-04
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- basic support for LiPo rechargeable batteries ( `-D USERMOD_BATTERY_USE_LIPO`)
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- improved support for esp32 (read calibrated voltage)
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- corrected config saving (measurement pin, and battery min/max were lost)
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- various bugfixes
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@ -190,15 +190,30 @@ class UsermodBattery : public Usermod
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// calculate the voltage
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voltage = ((rawValue / getAdcPrecision()) * maxBatteryVoltage) + calibration;
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#endif
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// check if voltage is within specified voltage range
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voltage = ((voltage<minBatteryVoltage) || (voltage>maxBatteryVoltage)) ? -1.0f : voltage;
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// check if voltage is within specified voltage range, allow 10% over/under voltage
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voltage = ((voltage < minBatteryVoltage * 0.85f) || (voltage > maxBatteryVoltage * 1.1f)) ? -1.0f : voltage;
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// translate battery voltage into percentage
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/*
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the standard "map" function doesn't work
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https://www.arduino.cc/reference/en/language/functions/math/map/ notes and warnings at the bottom
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*/
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batteryLevel = mapf(voltage, minBatteryVoltage, maxBatteryVoltage, 0, 100);
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#ifdef USERMOD_BATTERY_USE_LIPO
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batteryLevel = mapf(voltage, minBatteryVoltage, maxBatteryVoltage, 0, 100); // basic mapping
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// LiPo batteries have a differnt dischargin curve, see
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// https://blog.ampow.com/lipo-voltage-chart/
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if (batteryLevel < 40.0f)
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batteryLevel = mapf(batteryLevel, 0, 40, 0, 12); // last 45% -> drops very quickly
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else {
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if (batteryLevel < 90.0f)
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batteryLevel = mapf(batteryLevel, 40, 90, 12, 95); // 90% ... 40% -> almost linear drop
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else // level > 90%
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batteryLevel = mapf(batteryLevel, 90, 105, 95, 100); // highest 15% -> drop slowly
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}
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#else
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batteryLevel = mapf(voltage, minBatteryVoltage, maxBatteryVoltage, 0, 100);
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#endif
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if (voltage > -1.0f) batteryLevel = constrain(batteryLevel, 0.0f, 110.0f);
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// if (calculateTimeLeftEnabled) {
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// float currentBatteryCapacity = totalBatteryCapacity;
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@ -556,7 +571,11 @@ class UsermodBattery : public Usermod
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*/
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void setMaxBatteryVoltage(float voltage)
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{
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maxBatteryVoltage = max(getMinBatteryVoltage()+1.0f, voltage);
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#ifdef USERMOD_BATTERY_USE_LIPO
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maxBatteryVoltage = max(getMinBatteryVoltage()+0.7f, voltage);
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#else
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maxBatteryVoltage = max(getMinBatteryVoltage()+1.0f, voltage);
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#endif
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}
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