KeyeStudio KS0135 EASY Plug Bluetooth 2.0 Serial Module The KeyeStudio KS0135 EASY Plug Bluetooth 2.0 Module adds short-range classic Bluetooth serial communication to Arduino-compatible projects. It is useful for robot control, wireless sensor reporting, phone terminal commands, and classroom serial communication experiments. The module operates in the 2.4 GHz ISM band and uses an onboard antenna for compact wiring. The RJ11 EASY Plug interface keeps the connection tidy with KeyeStudio boards, while UART-style communication makes firmware easy to understand. Use this module when a project needs simple serial data over Bluetooth rather than BLE services. It pairs well with the OpenELAB UNO R3 Intermediate Kit V2 for wireless control lessons and remote debugging demonstrations. Technical Specifications Parameter Value Manufacturer KeyeStudio Model KS0135 Wireless type Classic Bluetooth serial module Bluetooth standard Bluetooth 2.1 + EDR class behavior Frequency band 2.4 GHz ISM Interface UART serial through EASY Plug RJ11 Antenna Onboard PCB antenna Typical baud rate 9600 bps in many teaching examples Compatible controllers Arduino-compatible boards with serial pins Use case Short-range wireless command and data link Development support Arduino Serial / SoftwareSerial workflows Board Layout & Label Guide RJ11 connector: Carries power and UART signals in the EASY Plug ecosystem. TX signal: Module transmit line to the controller receive input. RX signal: Module receive line from the controller transmit output. Antenna area: Keep clear of metal parts for better signal stability. Status indicator: Shows pairing or connection state depending on firmware. Power rail: Use the voltage expected by the host control board. Serial note: Confirm baud rate and TX/RX direction before debugging software. Application Scenarios 1. Bluetooth Serial Echo Forward bytes between the USB serial monitor and the Bluetooth serial module for quick pairing and baud-rate testing. #include SoftwareSerial BT(10, 11); // RX, TX void setup() { Serial.begin(9600); BT.begin(9600); Serial.println("Bluetooth bridge ready"); } void loop() { if (BT.available()) Serial.write(BT.read()); if (Serial.available()) BT.write(Serial.read()); } 2. Phone-Controlled LED Send '1' or '0' from a Bluetooth terminal app to turn an LED on or off. #include SoftwareSerial BT(10, 11); const int LED_PIN = 13; void setup() { pinMode(LED_PIN, OUTPUT); BT.begin(9600); } void loop() { if (BT.available()) { char c = BT.read(); if (c == '1') digitalWrite(LED_PIN, HIGH); if (c == '0') digitalWrite(LED_PIN, LOW); } } 3. Wireless Sensor Reporter Read an analog sensor and stream the value over Bluetooth once per second. #include SoftwareSerial BT(10, 11); const int SENSOR_PIN = A0; void setup() { BT.begin(9600); } void loop() { int raw = analogRead(SENSOR_PIN); BT.print("analog="); BT.println(raw); delay(1000); } Packing List 1 x KeyeStudio EASY Plug Bluetooth 2.0 Module FAQ Q: Is this BLE?A: No. It is a classic Bluetooth serial-style module. Q: Can it connect to a phone?A: Usually yes with a compatible Bluetooth serial terminal app and host OS support. Q: Can it upload Arduino sketches wirelessly?A: It is mainly for serial data; wireless upload depends on board and bootloader setup. Q: What baud rate should I use?A: Many examples use 9600 bps; check the module configuration if communication fails. Q: Why can I pair but not receive data?A: Check TX/RX direction, baud rate, app settings, and whether another device is already connected. Q: Does it need an external antenna?A: No. The antenna is built in. Q: Can it control a robot?A: Yes. Send serial commands from a phone or PC and parse them in the robot firmware. Q: Is it suitable for high-speed data streaming?A: It is better for commands and moderate serial telemetry than high-bandwidth data.
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