How to Use JST-RCY_F: Examples, Pinouts, and Specs

The JST-RCY_F is a compact and reliable electrical connector manufactured by JST. It is widely used in electronics for creating secure and durable connections between components. This connector features a robust locking mechanism, ensuring stable connections even in environments subject to vibration or movement. Its compact design makes it ideal for applications where space is limited.

• Battery connections in RC (remote control) vehicles, drones, and robotics
• Power delivery in small electronic devices
• Connections in LED lighting systems
• General-purpose low-voltage DC power applications

The JST-RCY_F connector is designed to provide a secure and efficient electrical connection. Below are its key technical specifications:

The JST-RCY_F connector consists of two pins, typically used for power and ground connections. Below is the pin configuration:

1. Prepare the Wires: Strip the insulation from the ends of the wires you intend to connect. Ensure the stripped length matches the connector's crimp terminal specifications.
2. Crimp the Terminals: Use a crimping tool compatible with JST connectors to attach the crimp terminals to the wires. Ensure a secure and proper crimp to avoid loose connections.
3. Insert the Terminals: Insert the crimped terminals into the JST-RCY_F housing until they click into place. Verify that the terminals are locked securely.
4. Connect the Mating Connector: Align the male and female connectors and push them together until the locking mechanism engages.

• Wire Gauge: Use wires within the specified gauge range (22 AWG to 28 AWG) to ensure proper fit and electrical performance.
• Crimping Tool: Always use a crimping tool designed for JST connectors to achieve reliable connections.
• Polarity: Double-check the polarity of the connections to avoid damage to your circuit.
• Locking Mechanism: Ensure the connectors are fully engaged and the locking mechanism is secure to prevent accidental disconnection.

The JST-RCY_F connector can be used to supply power to an Arduino UNO. Below is an example of how to connect a 7.4V LiPo battery with a JST-RCY_F connector to the Arduino's VIN and GND pins.

• Pin 1 (Positive): Connect to the Arduino's VIN pin.
• Pin 2 (Negative): Connect to the Arduino's GND pin.

The following Arduino code demonstrates reading the battery voltage using an analog pin:

// Define the analog pin connected to the battery voltage divider
const int batteryPin = A0;

// Voltage divider resistor values (in ohms)
const float R1 = 10000.0; // Resistor connected to battery positive
const float R2 = 10000.0; // Resistor connected to ground

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

void loop() {
  int rawValue = analogRead(batteryPin); // Read the analog value
  float voltage = (rawValue / 1023.0) * 5.0; // Convert to voltage (Arduino 5V ADC)
  float batteryVoltage = voltage * ((R1 + R2) / R2); // Calculate actual battery voltage

  Serial.print("Battery Voltage: ");
  Serial.print(batteryVoltage);
  Serial.println(" V");

  delay(1000); // Wait for 1 second before the next reading
}

Note: Use a voltage divider to ensure the battery voltage does not exceed the Arduino's analog input range (0-5V).

1. Loose Connections:

   • Issue: The connector feels loose or disconnects easily.
   • Solution: Ensure the crimp terminals are properly secured and fully inserted into the housing. Verify that the locking mechanism is engaged.

2. Overheating:

   • Issue: The connector becomes warm during operation.
   • Solution: Check that the current does not exceed the 3A rating. Use thicker wires (lower AWG) if necessary.

3. Polarity Reversal:

   • Issue: The circuit does not function or components are damaged.
   • Solution: Double-check the polarity of the connections before powering the circuit.

4. Crimping Issues:

   • Issue: The wire slips out of the terminal.
   • Solution: Use a proper crimping tool and ensure the wire is stripped to the correct length.

• Q: Can the JST-RCY_F handle AC voltage?

  • A: No, the JST-RCY_F is designed for low-voltage DC applications only.

• Q: Is the connector waterproof?

  • A: No, the JST-RCY_F is not waterproof. Use additional sealing methods if moisture resistance is required.

• Q: Can I reuse the connector housing?

  • A: Yes, the housing can be reused, but the crimp terminals may need to be replaced if damaged.

• Q: What is the maximum wire length I can use?

  • A: The maximum wire length depends on the current and voltage drop requirements of your application. For best results, keep the wires as short as possible.