M5 Stack Battery Module for ESP32 Core Development Kit Documentation

Battery Type

Rechargeable Li-Polymer

Battery Capacity

150mAh

Charging Input

Micro-USB

Charging Voltage

5V

Charging Current

500mA

Operating Temperature Range

-20C to 70C

Dimensions

25mm x 25mm x 7mm

Weight

10g

Applications

The M5 Stack Battery Module is ideal for use in a variety of IoT applications, including

Wearable devices

Wireless sensors

Robotics

Automation systems

Smart home devices

By providing a reliable and efficient power management solution, the M5 Stack Battery Module enables developers to focus on building innovative IoT applications with the ESP32 Core Development Kit.

Pin Configuration

M5 Stack Battery Module for ESP32 Core Development Kit Pinout Guide
The M5 Stack Battery Module is a compact power management solution designed specifically for the ESP32 Core Development Kit. This module provides a convenient and efficient way to power your ESP32-based projects. Below is a detailed explanation of the pins on the Battery Module, along with a step-by-step guide on how to connect them.
Pinout:
1. VIN: Input voltage pin (3.3V - 6.0V)
Connect to a power source, such as a USB port or a battery, to charge the internal battery.
Note: Make sure the input voltage does not exceed 6.0V to avoid damaging the module.
2. VOUT: Output voltage pin (3.3V)
Connect to the ESP32 Core Development Kit's power input pin (VCC) to provide power to the board.
3. GND: Ground pin
Connect to the ESP32 Core Development Kit's ground pin (GND) to provide a common ground reference.
4. B+: Positive terminal of the internal battery
Connect to the positive terminal of an external battery (if used) or leave unconnected if using the internal battery only.
5. B-: Negative terminal of the internal battery
Connect to the negative terminal of an external battery (if used) or leave unconnected if using the internal battery only.
6. CHG: Charging indicator pin
Connect to a digital pin on the ESP32 Core Development Kit to monitor the charging status.
When the module is charging, this pin will be high (3.3V); when charging is complete, it will be low (0V).
7. PWR: Power enable pin
Connect to a digital pin on the ESP32 Core Development Kit to control the power output of the module.
When this pin is high (3.3V), the module will output power; when it's low (0V), the module will shut down.
Connection Structure:
To connect the M5 Stack Battery Module to your ESP32 Core Development Kit, follow these steps:
Step 1: Power Connection
Connect the VIN pin on the Battery Module to a power source (e.g., a USB port or a battery).
Connect the VOUT pin on the Battery Module to the VCC pin on the ESP32 Core Development Kit.
Step 2: Ground Connection
Connect the GND pin on the Battery Module to the GND pin on the ESP32 Core Development Kit.
Step 3: Charging Indication (Optional)
Connect the CHG pin on the Battery Module to a digital pin on the ESP32 Core Development Kit (e.g., GPIO 2).
Use this pin to monitor the charging status in your code.
Step 4: Power Control (Optional)
Connect the PWR pin on the Battery Module to a digital pin on the ESP32 Core Development Kit (e.g., GPIO 15).
Use this pin to control the power output of the module in your code.
Tips and Precautions:
Make sure to handle the module by the edges to prevent damaging the pins.
Avoid shorting the pins or applying excessive voltage to prevent damage to the module or the ESP32 Core Development Kit.
Use a suitable power source and battery to ensure safe and efficient operation.
By following these steps and precautions, you can successfully integrate the M5 Stack Battery Module into your ESP32-based projects, ensuring a reliable and efficient power management solution.

Code Examples

M5 Stack Battery Module for ESP32 Core Development Kit Documentation

Overview

The M5 Stack Battery Module is a rechargeable lithium-ion polymer battery designed for use with the ESP32 Core Development Kit. It provides a convenient and compact power solution for IoT projects, enabling developers to create portable and battery-powered devices.

Technical Specifications

Battery Type: Lithium-ion Polymer
 Capacity: 390mAh
 Voltage: 3.7V
 Charging Current: 500mA
 Dimensions: 35.5 x 25.5 x 4.5 mm
 Weight: 15g

Connecting the Battery Module

To use the M5 Stack Battery Module with the ESP32 Core Development Kit, connect the module to the Kit's battery pins as follows:

Vbat pin on the Kit to the Vbat pin on the Battery Module
 GND pin on the Kit to the GND pin on the Battery Module

Code Examples

### Example 1: Battery Voltage Monitoring

This example demonstrates how to use the M5 Stack Battery Module to monitor the battery voltage level using the ESP32's analog-to-digital converter (ADC).

```c
#include <M5Stack.h>

void setup() {
  Serial.begin(115200);
}

void loop() {
  int batteryVoltage = analogRead(BATTERY_PIN);
  float voltage = (batteryVoltage  2  3.3) / 4095;
  Serial.print("Battery Voltage: ");
  Serial.print(voltage);
  Serial.println(" V");
  delay(1000);
}
```

In this example, the `analogRead()` function is used to read the voltage level from the BATTERY_PIN on the ESP32. The voltage value is then calculated using the ADC conversion formula and printed to the serial console.

### Example 2: Low Battery Warning

This example demonstrates how to use the M5 Stack Battery Module to trigger a low battery warning when the voltage level falls below a certain threshold.

```c
#include <M5Stack.h>

#define LOW_BATTERY_THRESHOLD 3.5

void setup() {
  Serial.begin(115200);
}

void loop() {
  int batteryVoltage = analogRead(BATTERY_PIN);
  float voltage = (batteryVoltage  2  3.3) / 4095;
  
  if (voltage < LOW_BATTERY_THRESHOLD) {
    Serial.println("Low Battery Warning!");
    // Add additional code here to trigger an alarm or notification
  }
  
  delay(1000);
}
```

In this example, the voltage level is continuously monitored and compared to the `LOW_BATTERY_THRESHOLD` value. When the voltage level falls below the threshold, a low battery warning message is printed to the serial console. You can add additional code to trigger an alarm or notification based on your specific requirements.

Note: These examples assume you have the M5Stack library installed and configured for your ESP32 Core Development Kit.