How to Use Adafruit MicroLipo Charger USB Type C: Examples, Pinouts, and Specs

The Adafruit MicroLipo Charger USB Type C (Manufacturer Part ID: 4410) is a compact and efficient lithium polymer (LiPo) battery charger designed for small LiPo batteries. It connects via a USB Type C port, making it convenient for modern devices and power sources. This charger is ideal for applications requiring portable power solutions, such as wearable electronics, IoT devices, and small robotics.

• Charging single-cell LiPo batteries for portable electronics
• Powering small IoT devices and sensors
• Wearable technology projects
• Prototyping and development of battery-powered systems

The Adafruit MicroLipo Charger USB Type C is designed to provide safe and efficient charging for single-cell LiPo batteries. Below are its key technical details:

The Adafruit MicroLipo Charger USB Type C has the following pins and connectors:

1. Connect the Battery: Attach the LiPo battery to the BAT+ and GND terminals. Ensure correct polarity to avoid damage.
2. Power the Charger: Plug a USB Type C cable into the charger and connect it to a 5V USB power source (e.g., a computer or USB wall adapter).
3. Monitor Charging: The CHRG LED will light up to indicate charging is in progress. Once the battery is fully charged, the LED will turn off.
4. Select Charging Current (Optional): By default, the charger is set to 100mA. To increase the charging current to 500mA, solder the PROG jumper on the back of the board.

• Battery Compatibility: Only use this charger with single-cell LiPo batteries rated at 3.7V nominal (4.2V fully charged).
• Charging Current: Ensure the selected charging current (100mA or 500mA) is appropriate for your battery's capacity. A general rule is to set the charging current to 0.5C (half the battery's capacity in mAh).
• Heat Management: The charger may become warm during operation. Ensure adequate ventilation to prevent overheating.
• Polarity: Always double-check the battery's polarity before connecting it to the charger to avoid damage.

The Adafruit MicroLipo Charger USB Type C can be used to charge a LiPo battery that powers an Arduino UNO. Below is an example of how to monitor the battery voltage using the Arduino:

// Example code to monitor LiPo battery voltage using Arduino UNO
// Connect the battery's positive terminal to an analog pin (e.g., A0)
// Use a voltage divider if the battery voltage exceeds 5V

const int batteryPin = A0; // Analog pin connected to battery
float batteryVoltage = 0.0;

void setup() {
  Serial.begin(9600); // Initialize serial communication
}

void loop() {
  int sensorValue = analogRead(batteryPin); // Read analog value
  // Convert the analog reading to voltage (assuming 5V reference)
  batteryVoltage = sensorValue * (5.0 / 1023.0);
  
  Serial.print("Battery Voltage: ");
  Serial.print(batteryVoltage);
  Serial.println(" V");
  
  delay(1000); // Wait 1 second before next reading
}

Note: If the battery voltage exceeds 5V, use a voltage divider to scale it down before connecting to the Arduino's analog pin.

1. Can I use this charger with a 2-cell LiPo battery?
   No, this charger is designed for single-cell (3.7V nominal) LiPo batteries only.

2. How do I change the charging current?
   To change the charging current from 100mA to 500mA, solder the PROG jumper on the back of the board.

3. What happens if I connect the battery with reversed polarity?
   Connecting the battery with reversed polarity can damage the charger and the battery. Always double-check the connections before powering the charger.

4. Can I use this charger while the battery is powering a circuit?
   Yes, but ensure the circuit's current draw does not exceed the charger's input current capacity.

By following this documentation, you can safely and effectively use the Adafruit MicroLipo Charger USB Type C in your projects.