When prototyping a new robot, the easiest path forward is to grab an Arduino or a Raspberry Pi, wire it up to some off-the-shelf motor drivers, and use a breadboard or protoboard to connect the sensors. This is great for proving a concept.

But when it is time to move from prototype to production—when that robot needs to survive vibrations, fit into a sleek chassis, and run reliably for 10,000 hours—that web of jumper wires becomes a massive liability.

To build world-class robotics, you must design custom Printed Circuit Boards (PCBs). Here is how bespoke PCB design fundamentally improves a robot’s performance, durability, and cost.

1. Spatial Optimization and Mechatronic Integration

The most obvious benefit of a custom PCB is space. In robotics, internal volume is a premium commodity. Every cubic centimeter taken up by bulky, generic control boards is space that cannot be used for larger batteries or heavier payload structures.

By designing a custom PCB, engineers can combine the main microcontroller, power distribution, motor drivers, and sensor interfaces onto a single, tightly integrated board.

Furthermore, custom PCBs allow for true mechatronic integration. The board can be shaped to physically fit the contours of the robot’s joints. At Entlar, we design annular (donut-shaped) PCBs that fit directly over the motor shaft inside a robotic actuator, eliminating external wiring entirely.

2. Signal Integrity and Noise Immunity

A robot is a hostile electrical environment. You have massive motors pulling high-current spikes right next to delicate sensors trying to read millivolt signals.

Off-the-shelf breakout boards connected by jumper wires act like antennas, picking up electromagnetic interference (EMI) from the motors. This noise ruins sensor accuracy and can cause microcontrollers to glitch and reset.

A custom PCB solves this through rigorous layout practices:

  • Dedicated Ground Planes: Providing a solid, continuous return path for currents prevents ground loops and dramatically reduces noise.
  • Careful Routing: High-speed digital signals (like SPI or Ethernet) are routed away from noisy switching power supplies. Differential pairs are length-matched to ensure signal integrity.
  • Proper Decoupling: Placing capacitors exactly where they are needed—right next to the IC power pins—ensures stable voltage during high-frequency operations.

3. Power Distribution and Thermal Management

Robots draw a lot of power. Sending 20 Amps through thin jumper wires will cause them to melt.

With a custom PCB, engineers can design the power architecture to handle extreme loads. We use heavy copper layers (2 oz or 4 oz) to carry high currents to the motor drivers safely.

Additionally, the PCB itself acts as a heatsink. By strategically placing thermal vias under hot components like MOSFETs, heat is wicked away through the copper layers to the chassis, preventing the electronics from throttling under heavy loads.

4. Supply Chain Resilience and Cost

Finally, relying on third-party breakout boards is a massive supply chain risk. If the manufacturer of your off-the-shelf motor driver stops making it, your entire robot production line stops.

By designing the PCB in-house, you own the Bill of Materials (BOM). If a specific chip goes out of stock, you have the flexibility to redesign the board for a drop-in replacement. Moreover, at scale, a single custom PCB is vastly cheaper to manufacture and assemble than buying five different generic modules and paying humans to wire them together.

Conclusion

Custom PCB design is not just a manufacturing step; it is a core performance differentiator. It separates fragile prototypes from robust, industrial-grade machines. In the hardware world, controlling the silicon layout is how you control your destiny.