RadioMaster ERS-BA01 Baro Sensor
by RadioMaster

The RadioMaster ERS-BA01 Baro Sensor is a high-precision barometric altitude sensor specifically engineered for integration with ExpressLRS (ELRS) telemetry systems. Utilizing the advanced Bosch BMP280 pressure sensor, the ERS-BA01 provides ultra-accurate altitude data with a resolution of up to 0.1 meters. This compact module is designed to connect directly to the CRSF (Crossfire) protocol serial port on ELRS receivers, allowing pilots to receive real-time vertical telemetry on their transmitters without the need for a full flight controller. This makes it an essential upgrade for fixed-wing gliders, RC planes, and specialized sUAS platforms where precise altitude monitoring is critical for mission success.

Tailored for the professional sUAS market, government contractors, and the educational sector, the ERS-BA01 is a vital tool for flight testing and atmospheric research. For university aerospace programs, it provides a cost-effective method for students to study barometric pressure changes and flight dynamics. In tactical or search-and-rescue applications, the sensor’s ability to provide high-resolution variometer and altitude feedback allows operators to maintain strict altitude compliance and optimize thermal soaring efficiency. Its lightweight, miniature footprint and wide input voltage range ensure seamless integration into a variety of airframes, from micro-FPV rigs to large-scale reconnaissance drones.

Specifications

• Sensor Type: Bosch BMP280 Precision Barometric Pressure Sensor

• Altitude Resolution: 0.1m

• Input Voltage: DC 3.3V – 5.0V

• Communication Protocol: CRSF (Connects to Receiver Serial Port)

• Dimensions: 15.5mm x 9.5mm x 3.2mm

• Weight: 0.8g (excluding wires)

• Compatibility: All ExpressLRS (ELRS) receivers with a spare UART/Serial port

• Operating Temperature: -20°C to +85°C

• Altitude Range: -500m to +9000m

What is Included

• 1x RadioMaster ERS-BA01 Precision Baro Sensor

• 1x CRSF Connection Cable (4-pin)

• 1x Transparent Heat Shrink Tube