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Merge pull request #137 from unlogisch04/Battery_ESP32

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battery add esp32 ADC specs
This commit is contained in:
Eiren Rain
2022-03-31 16:51:00 +03:00
committed by GitHub
parent 8a371ecaa2 8f0a9a88f6
commit 2db40ed657
3 changed files with 48 additions and 10 deletions
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19
src/batterymonitor.cpp
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@@ -51,30 +51,33 @@ void BatteryMonitor::Loop()
auto now_ms = millis();
if (now_ms - last_battery_sample >= batterySampleRate)
{
last_battery_sample = now_ms;
voltage = -1;
#if ESP8266 && (BATTERY_MONITOR == BAT_INTERNAL || BATTERY_MONITOR == BAT_INTERNAL_MCP3021)
last_battery_sample = now_ms;
auto level = ESP.getVcc();
if (level > voltage_3_3)
// Find out what your max measurement is (voltage_3_3).
// Take the max measurement and check if it was less than 50mV
// if yes output 5.0V
// if no output 3.3V - dropvoltage + 0.1V
auto ESPmV = ESP.getVcc();
if (ESPmV > voltage_3_3)
{
voltage_3_3 = level;
voltage_3_3 = ESPmV;
}
else
{
//Calculate drop in mV
level = voltage_3_3 - level;
if (level < 50)
ESPmV = voltage_3_3 - ESPmV;
if (ESPmV < 50)
{
voltage = 5.0F;
}
else
{
voltage = 3.3F - ((float)level / 1000.0F) + 0.1F; //we assume 100mV drop on the linear converter
voltage = 3.3F - ((float)ESPmV / 1000.0F) + 0.1F; //we assume 100mV drop on the linear converter
}
}
#endif
#if BATTERY_MONITOR == BAT_EXTERNAL
last_battery_sample = now_ms;
voltage = ((float)analogRead(PIN_BATTERY_LEVEL)) * batteryADCMultiplier;
#endif
#if BATTERY_MONITOR == BAT_MCP3021 || BATTERY_MONITOR == BAT_INTERNAL_MCP3021

27
src/batterymonitor.h
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@@ -30,14 +30,39 @@
#include <I2Cdev.h>
#include "logging/Logger.h"
#if ESP8266
#define ADCResulution 1023.0 // ESP8266 has 12bit ADC
#define ADCVoltageMax 1.0 // ESP8266 input is 1.0 V = 1023.0
#endif
#if ESP32
#define ADCResulution 4095.0 // ESP32 has 12bit ADC
#define ADCVoltageMax 3.3 // ESP32 input is 3.3 V = 4095.0
#endif
#ifndef ADCResulution
#define ADCResulution 1023.0
#endif
#ifndef ADCVoltageMax
#define ADCVoltageMax 1.0
#endif
#ifndef BATTERY_SHIELD_R1
#define BATTERY_SHIELD_R1 220.0
#endif
#ifndef BATTERY_SHIELD_R2
#define BATTERY_SHIELD_R2 100.0
#endif
#if BATTERY_MONITOR == BAT_EXTERNAL
#ifndef PIN_BATTERY_LEVEL
#error Internal ADC enabled without pin! Please select a pin.
#endif
// Wemos D1 Mini has an internal Voltage Divider with R1=220K and R2=100K > this means, 3.3V analogRead input voltage results in 1023.0
// Wemos D1 Mini with Wemos Battery Shield v1.2.0 or higher: Battery Shield with J2 closed, has an additional 130K resistor. So the resulting Voltage Divider is R1=220K+100K=320K and R2=100K > this means, 4.5V analogRead input voltage results in 1023.0
// ESP32 Boards may have not the internal Voltage Divider. Also ESP32 has a 12bit ADC (0..4095). So R1 and R2 can be changed.
// Diagramm:
// (Battery)--- [BATTERY_SHIELD_RESISTANCE] ---(INPUT_BOARD)--- [BATTERY_SHIELD_R2] ---(ESP_INPUT)--- [BATTERY_SHIELD_R1] --- (GND)
// SlimeVR Board can handle max 5V > so analogRead of 5.0V input will result in 1023.0
#define batteryADCMultiplier 1.0 / 1023.0 * (320 + BATTERY_SHIELD_RESISTANCE) / 100
#define batteryADCMultiplier ADCVoltageMax / ADCResulution * (BATTERY_SHIELD_R1 + BATTERY_SHIELD_R2 + BATTERY_SHIELD_RESISTANCE) / BATTERY_SHIELD_R1
#elif BATTERY_MONITOR == BAT_MCP3021 || BATTERY_MONITOR == BAT_INTERNAL_MCP3021
// Default recommended resistors are 9.1k and 5.1k
#define batteryADCMultiplier 3.3 / 1023.0 * 14.2 / 9.1

12
src/defines.h
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@@ -33,9 +33,19 @@
#define SECOND_IMU_ROTATION DEG_270
// Battery monitoring options (comment to disable):
// BAT_EXTERNAL for ADC pin, BAT_INTERNAL for internal - can detect only low battery, BAT_MCP3021 for external ADC
// BAT_EXTERNAL for ADC pin,
// BAT_INTERNAL for internal - can detect only low battery,
// BAT_MCP3021 for external ADC connected over I2C
#define BATTERY_MONITOR BAT_EXTERNAL
// BAT_EXTERNAL definition
// D1 Mini boards with ESP8266 have internal resistors. For these boards you only have to adjust BATTERY_SHIELD_RESISTANCE.
// For other boards you can now adjust the other resistor values.
// The diagram looks like this:
// (Battery)--- [BATTERY_SHIELD_RESISTANCE] ---(INPUT_BOARD)--- [BATTERY_SHIELD_R2] ---(ESP32_INPUT)--- [BATTERY_SHIELD_R1] --- (GND)
#define BATTERY_SHIELD_RESISTANCE 180 //130k BatteryShield, 180k SlimeVR or fill in external resistor value in kOhm
// #define BATTERY_SHIELD_R1 100 // Board voltage divider resistor Ain to GND in kOhm
// #define BATTERY_SHIELD_R2 220 // Board voltage divider resistor Ain to INPUT_BOARD in kOhm
// Board-specific configurations
#if BOARD == BOARD_SLIMEVR