Trailer Control Box
Trailer control board built around an ATmega2560, the same microcontroller family used in the Arduino Mega, with five relay channels (15A and 30A rated) switching the lighting and electric brake loads, ACS712 current sensing, voltage and ground-sense monitoring, and a 7-way RV trailer connector interface. Built for AULFAB.
Project overview
Trailer control board built around an ATmega2560, the same microcontroller family used in the Arduino Mega, with five relay channels (15A and 30A rated) switching the lighting and electric brake loads, ACS712 current sensing, voltage and ground-sense monitoring, and a 7-way RV trailer connector interface. Built for AULFAB.
Engineering approach
Automotive and vehicle-adjacent hardware has to keep working through vibration, temperature swings, and electrically noisy environments that consumer electronics never see. On this board, that translates into a component set built around ATmega2560, 5x Relays, ACS712 Current Sensing and Ground Sense, with layout and stack-up decisions driven by vibration resistance, wide operating temperature range, and robust connector and harness interfacing.
Technical specification
From prototype to PCB
The original system was a prototype assembled from separate boards and modules connected by extensive wiring. This control PCB consolidates those functions onto a single board.
Engineering focus
This portfolio project demonstrates CircuitNexa's electronics engineering and PCB design work in the automotive space. The design shown here is part of a broader portfolio spanning schematic capture, PCB layout, embedded firmware, prototyping, and support through to manufacturing.
Building a hardware product?
CircuitNexa helps startups and engineering teams turn electronics concepts into manufacturable hardware.
Talk to CircuitNexaCase study
Read the full story behind this board, including the design constraints of the 7-way trailer interface and where the project stands today: Trailer control box case study.
