Sensor.java

    public int getBatteryColor() {
        if (this.vbat > GOOD_BATTERY_VOLTAGE) {
            return Color.parseColor(GREEN);
        }
        if (this.vbat > CRITICAL_BATTERY_VOLTAGE + VOLTAGE_BUFFOR) {
            return Color.YELLOW;
        }
        return Color.RED;
    }

    public boolean batteryNeedRecharge() {
        return this.vbat <= CRITICAL_BATTERY_VOLTAGE;
    }