About Matek AP_Periph CAN-L4-BM CAN Digital Power Monitor
The Matek AP_Periph CAN-L4-BM CAN Digital Power Monitor offers ultra-precise monitoring for your drone needs. It features a low-power resistant path of 200μΩ, providing high efficiency in power consumption. No calibration is required and DroneCAN protocol offers convenient current & bus voltage readouts. Enjoy precision monitoring and convenience with the AP_Periph CAN CAN-L4-BM.
30-Day Returns From Shipment | 7-Day No-Reason Returns
24h Support Response | 24h Fast Support Guarantee
Top highlights
Built with TI INA239 and STM32L431 running ArduPilot AP_Periph firmware, it delivers accurate real-time voltage and current data over CAN without analog calibration.
Supports up to 0–85V input voltage and 0–204.8A current sensing (approx. 150A continuous), suitable for FPV, multirotor, and medium-to-large UAV power systems.
Uses DroneCAN protocol for direct communication with flight controllers, ensuring stable data transmission with strong anti-interference performance.
Features ultra-low resistance (approx. 200μΩ) current path design, with voltage accuracy of ±0.1% and current accuracy of ±2% for professional-grade telemetry.
Ultra-compact size (approx. 30×22×3mm) and only ~4g weight. Powered by 5V (4.5–5.5V range) with DFU firmware upgrade support for ArduPilot ecosystems.
Payment | Every order you place with us is safe & secure
Share
Tips
● The big pad on the bottom side is a dead pad. No any circuit network on it.
● Solder the positive wires as close as possible to both sides of the current sensing resistor.
● 2 ears for mounting can be cut off if you don’t need it.
● If the CAN wires are too long, bridge the “120R” jumper.
Specifications
● MCU: STM32L431xC, 256KB Flash
● INA239 85-V, 16-Bit, High-Precision Power monitor IC With SPI Interface
● Battery Voltage sense input: 0~85V
● Current Sense Range: 0~204.8A
● Load current on current sensing resistor: 150A(Continuous), 204.8A(Burst)
● Parameters: CAN_P1_DRIVER = 1 if attached to CAN bus1 port or CAN_P2_DRIVER = 1 if attached to CAN bus2 port, BATTx_MONITOR = 8 (DroneCAN-BatteryInfo)
Recommendation
Reviews
A*******t
Verified
Accurate voltage and current readings right out of the box. DroneCAN integration was quick and required no calibration.
Specification：CAN L4 BM
A*******r
Verified
Excellent power monitor for ArduPilot builds. The readings stay consistent even during high current flights.
Specification：CAN L4 BM
D***********r
Verified
Handles high-current applications very well and provides clean telemetry for my Pixhawk setup.
Specification：CAN L4 BM
U*****h
Verified
Installation was straightforward with the JST-GH cable included. Firmware update was simple using DroneCAN GUI.
Specification：CAN L4 BM
T*******r
Verified
Great value for anyone building a DroneCAN system. Documentation made installation much easier.
Specification：CAN L4 BM
S*******r
Verified
Compact, lightweight, and very accurate. A great choice for larger UAVs using DroneCAN.
Specification：CAN L4 BM
R********r
Verified
Build quality is excellent and the CAN communication has been completely reliable so far.
Specification：CAN L4 BM
L**********V
Verified
Firmware configuration took a few minutes, but once completed everything worked flawlessly.
Specification：CAN L4 BM
1
2
FAQFeel free to ask us any questions
Q: What is the Matek AP_Periph CAN-L4-BM Digital Power Monitor used for?
A: It is a high-precision digital power monitoring module designed for UAV and drone systems. It measures battery voltage and current data and transmits real-time power information through the CAN/DroneCAN protocol.
Q: What flight controllers are compatible with the CAN-L4-BM?
A: It is compatible with flight controllers that support the DroneCAN protocol, especially ArduPilot-based systems with AP_Periph support.
Q: What voltage range does the power monitor support?
A: It supports battery voltage input from 0V to 85V, making it suitable for various UAV power systems.
Q: How much current can the CAN-L4-BM measure?
A: It supports current measurement from 0A to 204.8A, with approximately 150A continuous current capability and up to 204.8A burst current.
Q: Does it require current calibration?
A: No. Thanks to the high-precision INA239 power monitoring IC and digital DroneCAN communication, it does not require traditional analog current calibration.
Verified