CAN Ultrasonic Sensor Module
Budget: $250 – $750 USD
I’m building a mobile robot and need a dedicated control board that polls multiple ultrasonic transducers and streams their distance data over CAN 2.0B at roughly 500 kbps. The primary sensor will be the AJ-SR04M; however, I’d like the design to remain compatible with other SR04-style parts (HC-SR04, JSN-SR04T, etc.) for bench testing.
Core functions
• Eight to ten sensor channels, each sampled near 20 Hz
• 12 V supply input with on-board 5 V and 3.3 V regulation
• CAN output frame containing distance in millimetres plus a valid/error flag per sensor
Hardware specifics are flexible—there’s no strict board outline—so feel free to optimise for size and routing ease. A microcontroller family you’re comfortable with (STM32, AVR, ESP32, etc.) is fine as long as firmware, configuration and any needed drivers are open and well-commented.
Deliverables
• Complete schematic and production-ready PCB package (Gerbers, BOM, pick-and-place)
• Fully documented firmware source with build instructions
• A brief test routine demonstrating correct CAN messages from eight sensors simultaneously
Please include examples of past work on similar embedded or CAN-based projects when you reply. I’m aiming to wrap the project in about four weeks, so let me know if that timeline works for you and what milestones you suggest to stay on track.
Core functions
• Eight to ten sensor channels, each sampled near 20 Hz
• 12 V supply input with on-board 5 V and 3.3 V regulation
• CAN output frame containing distance in millimetres plus a valid/error flag per sensor
Hardware specifics are flexible—there’s no strict board outline—so feel free to optimise for size and routing ease. A microcontroller family you’re comfortable with (STM32, AVR, ESP32, etc.) is fine as long as firmware, configuration and any needed drivers are open and well-commented.
Deliverables
• Complete schematic and production-ready PCB package (Gerbers, BOM, pick-and-place)
• Fully documented firmware source with build instructions
• A brief test routine demonstrating correct CAN messages from eight sensors simultaneously
Please include examples of past work on similar embedded or CAN-based projects when you reply. I’m aiming to wrap the project in about four weeks, so let me know if that timeline works for you and what milestones you suggest to stay on track.