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Fixup battery calc

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This commit is contained in:
Tomislav Kopić 2024-11-30 17:14:34 +01:00
parent 0929f103c5
commit 1f2ff6d4cf
2 changed files with 47 additions and 0 deletions
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18
src/SmartCube/cubeBattery.h Normal file
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@ -0,0 +1,18 @@
#define ADC_PIN 10 // GPIO10 on WEMOS S2 Mini
const float R1 = 100000.0; // 100k ohms
const float R2 = 47000.0; // 47k ohms
const float ADC_MAX = 4095.0; // 12-bit ADC resolution
const float V_REF = 3.3; // Reference voltage for ESP32-S2 ADC
float readBatteryVoltage() {
int rawADC = analogRead(ADC_PIN);
float voltage = (rawADC / ADC_MAX) * V_REF;
return voltage * (R1 + R2) / R2; // Scale to actual battery voltage
}
int batteryPercentage(float voltage) {
if (voltage >= 4.2) return 100;
if (voltage <= 3.0) return 0;
return (voltage - 3.0) * 100 / (4.2 - 3.0); // Linear mapping
}

29
src/main.cpp
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@ -4,6 +4,7 @@
#include "SmartCube/cubeSound.h" // Include custom header for sound functions
#include "SmartCube/cubeButtons.h" // Include custom header for button handling functions
#include "SmartCube/cubeWifiManager.h" // Include custom header for managing WiFi connections
#include "SmartCube/cubeBattery.h" // Include custom header for reading battery level
// Initialize the OLED display with specified width, height, and reset pin
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
@ -11,7 +12,35 @@ Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
// Initialize the WiFi manager, passing the display object for any display output
cubeWifiManager cubeWifiManager(display);
void initSystems() {
pinMode(PIN_BTN_L, INPUT);
pinMode(PIN_BTN_M, INPUT);
pinMode(PIN_BTN_R, INPUT);
pinMode(PIN_BUZZER, OUTPUT);
pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, HIGH);
Wire.begin(); // Initialize I2C
Wire.setClock(400000L); // Set I2C to Fast Mode (400 kHz)
display.ssd1306_command(SSD1306_SETCONTRAST);
display.ssd1306_command(200); // Value between 0 and 255
// Initialize the SSD1306 display
if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Adjust I2C address if needed
for(;;); // Don't proceed, loop forever
}
// Rotate the display 180 degrees
display.setRotation(2);
// Clear the display buffer
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(0, 0);
display.display();
}
void setup() {
initSystems();
cubeWifiManager.start(); // Start the WiFi manager
}