How to Use Sharvi electronics: Examples, Pinouts, and Specs

The HW-357 Li-ion Battery Charge Discharge Power Bank Charger Module, manufactured by Sharvi Electronics, is a versatile and compact module designed for charging and discharging lithium-ion batteries. It integrates charging, discharging, and protection functionalities, making it ideal for portable power bank applications and other battery-powered devices. This module is widely used in DIY electronics projects, prototyping, and consumer electronics.

• Power banks for mobile devices
• DIY battery-powered projects
• Portable electronic devices
• Backup power systems
• Wearable technology

The HW-357 module is designed to provide efficient and safe charging and discharging of lithium-ion batteries. Below are its key technical details:

The HW-357 module has several pins and connectors for input, output, and battery connections. Below is the pin configuration:

1. Connect the Battery:
   • Connect the positive terminal of the 3.7V Li-ion battery to the BAT+ pin.
   • Connect the negative terminal of the battery to the BAT- pin.
2. Provide Input Power:
   • Use a 5V DC power source (e.g., USB adapter or power supply) and connect it to the micro-USB port or solder pads.
3. Connect the Load:
   • Attach the load (e.g., a device requiring 5V power) to the OUT+ and OUT- pins.
4. Monitor the LEDs:
   • The module has built-in indicator LEDs:
     • Red LED: Charging in progress.
     • Blue LED: Charging complete or discharging in progress.

• Ensure the input voltage does not exceed 5.5V to avoid damaging the module.
• Use a single-cell 3.7V Li-ion battery with a capacity of at least 1000mAh for optimal performance.
• Avoid short-circuiting the output terminals (OUT+ and OUT-).
• Do not exceed the maximum output current of 1A to prevent overheating or damage.
• If using the module with an Arduino UNO or other microcontroller, ensure the load does not exceed the module's output capacity.

Below is an example of how to use the HW-357 module to power an Arduino UNO:

1. Connect the OUT+ pin of the HW-357 module to the 5V pin of the Arduino UNO.
2. Connect the OUT- pin of the HW-357 module to the GND pin of the Arduino UNO.
3. Ensure the battery is connected to the BAT+ and BAT- pins of the module.
4. Provide input power to the module via the micro-USB port to charge the battery.

// Example Arduino code to blink an LED using power from the HW-357 module

const int ledPin = 13; // Pin connected to the onboard LED

void setup() {
  pinMode(ledPin, OUTPUT); // Set the LED pin as an output
}

void loop() {
  digitalWrite(ledPin, HIGH); // Turn the LED on
  delay(1000);                // Wait for 1 second
  digitalWrite(ledPin, LOW);  // Turn the LED off
  delay(1000);                // Wait for 1 second
}

1. Module Overheating:

   • Cause: Excessive load current or input voltage above 5.5V.
   • Solution: Reduce the load current to below 1A and ensure the input voltage is within the specified range.

2. Battery Not Charging:

   • Cause: Loose connections or faulty battery.
   • Solution: Check the connections to the BAT+ and BAT- pins. Replace the battery if necessary.

3. No Output Voltage:

   • Cause: Battery is over-discharged or disconnected.
   • Solution: Recharge the battery or reconnect it to the module.

4. LED Indicators Not Working:

   • Cause: Faulty module or incorrect wiring.
   • Solution: Verify all connections and replace the module if the issue persists.

1. Can I use this module with a 2-cell Li-ion battery pack?

   • No, the HW-357 is designed for single-cell 3.7V Li-ion batteries only.

2. What happens if the battery voltage drops below 2.5V?

   • The module's over-discharge protection will disconnect the battery to prevent damage.

3. Can I charge the battery and power a load simultaneously?

   • Yes, the HW-357 supports simultaneous charging and discharging, but ensure the total current does not exceed 1A.

4. Is the module compatible with solar panels?

   • Yes, as long as the solar panel provides a stable 5V output within the module's input voltage range.

By following this documentation, users can effectively integrate the HW-357 module into their projects and ensure safe and reliable operation.