WLED/usermods/Battery

Welcome to the battery usermod! 🔋

Enables battery level monitoring of your project.

For this to work, the positive side of the (18650) battery must be connected to pin A0 of the d1 mini/esp8266 with a 100k Ohm resistor (see Useful Links).

If you have an ESP32 board, connect the positive side of the battery to ADC1 (GPIO32 - GPIO39)

⚙️ Features

• 💯 Displays current battery voltage
• 🚥 Displays battery level
• 🚫 Auto-off with configurable Threshold
• 🚨 Low power indicator with many configuration posibilities

🎈 Installation

define USERMOD_BATTERY in wled00/my_config.h

Example wiring

Define Your Options

Name	Unit	Description
USERMOD_BATTERY		define this (in my_config.h) to have this usermod included wled00\usermods_list.cpp
USERMOD_BATTERY_MEASUREMENT_PIN		defaults to A0 on ESP8266 and GPIO35 on ESP32
USERMOD_BATTERY_MEASUREMENT_INTERVAL	ms	battery check interval. defaults to 30 seconds
USERMOD_BATTERY_MIN_VOLTAGE	v	minimum battery voltage. default is 2.6 (18650 battery standard)
USERMOD_BATTERY_MAX_VOLTAGE	v	maximum battery voltage. default is 4.2 (18650 battery standard)
USERMOD_BATTERY_TOTAL_CAPACITY	mAh	the capacity of all cells in parralel sumed up
USERMOD_BATTERY_CALIBRATION		offset / calibration number, fine tune the measured voltage by the microcontroller
Auto-Off	---	---
USERMOD_BATTERY_AUTO_OFF_ENABLED	true/false	enables auto-off
USERMOD_BATTERY_AUTO_OFF_THRESHOLD	% (0-100)	when this threshold is reached master power turns off
Low-Power-Indicator	---	---
USERMOD_BATTERY_LOW_POWER_INDICATOR_ENABLED	true/false	enables low power indication
USERMOD_BATTERY_LOW_POWER_INDICATOR_PRESET	preset id	when low power is detected then use this preset to indicate low power
USERMOD_BATTERY_LOW_POWER_INDICATOR_THRESHOLD	% (0-100)	when this threshold is reached low power gets indicated
USERMOD_BATTERY_LOW_POWER_INDICATOR_DURATION	seconds	for this long the configured preset is played

All parameters can be configured at runtime via the Usermods settings page.

⚠️ Important

• Make sure you know your battery specifications! All batteries are NOT the same!
• Example:

Your battery specification table		Options you can define
Capacity	3500mAh 12,5 Wh
Minimum capacity	3350mAh 11,9 Wh
Rated voltage	3.6V - 3.7V
Charging end voltage	4,2V ± 0,05	USERMOD_BATTERY_MAX_VOLTAGE
Discharge voltage	2,5V	USERMOD_BATTERY_MIN_VOLTAGE
Max. discharge current (constant)	10A (10000mA)
max. charging current	1.7A (1700mA)
...	...	...
..	..	..

Specification from: Molicel INR18650-M35A, 3500mAh 10A Lithium-ion battery, 3.6V - 3.7V

🌐 Useful Links

• https://lazyzero.de/elektronik/esp8266/wemos_d1_mini_a0/start
• https://arduinodiy.wordpress.com/2016/12/25/monitoring-lipo-battery-voltage-with-wemos-d1-minibattery-shield-and-thingspeak/

📝 Change Log

2023-01-04

• improved support for esp32 (read calibrated voltage)
• corrected config saving (measurement pin, and battery min/max were lost)
• various bugfixes

2022-12-25

• added "auto-off" feature
• added "low-power-indication" feature
• added "calibration/offset" field to configuration page
• added getter and setter, so that user usermods could interact with this one
• update readme (added new options, made it markdownlint compliant)

2021-09-02

• added "Battery voltage" to info
• added circuit diagram to readme
• added MQTT support, sending battery voltage
• minor fixes

2021-08-15

• changed USERMOD_BATTERY_MIN_VOLTAGE to 2.6 volt as default for 18650 batteries
• Updated readme, added specification table

2021-08-10

• Created