Embedded Systems & IoT Engineering

How a $1,600 ESP32 Network Replaced a $120,000 Bowling System

One small business's control cabinet did not need a specialist vendor and a seven-figure bill. It needed microcontrollers, relays, infrared sensors, and a software architecture that treats a bowling lane like any other machine on a network.

• A prototype for two lanes cost roughly $200; the full 8-lane job landed near $1,600 — about 1.3 percent of the vendor replacement quote.
• Each lane-pair runs on an ESP32 microcontroller: relays for motors and lights, optocouplers for isolation, and IR break-beam sensors to detect balls and strikes.
• The lanes talk to each other over ESPNow with an RS485 fallback, and all state funnels into a Raspberry Pi running a Redis-backed state machine.

The original control system for the lanes was installed in 2008 and had long since become a single-vendor black box. When it started failing, the manufacturer quoted thousands of dollars for replacement parts per pair of lanes and tens of thousands for a new system. The author of the project, an operations engineer who happened to own the venue, rebuilt the whole thing from scratch out of common off-the-shelf components. Every component is commodity hardware: microcontrollers wired to relays, optocouplers for electrical isolation, and simple IR break-beam sensors to sense when a ball crosses a line or a strike occurs.

The real engineering move was the networking architecture. The ESP32 chips communicate wirelessly using ESPNow, Espressif's low-overhead protocol for device-to-device links, with RS485 as a wired fallback so the system keeps working if the Wi-Fi flaps. Each lane-pair node streams events to a single Raspberry Pi lane computer — which is, in effect, just Redis acting as the authoritative store of game state, bolted to the ESP32 mesh through a small gateway. No proprietary firmware, no locked-in service contract.

The broader lesson is older than any chip: an industrial control cabinet is just software telling hardware what to do, and there is no requirement that the software be supplied by the machine's original manufacturer. Modern, cheap, Wi-Fi-capable microcontrollers have pushed the cost of building small control systems so far down that the barrier is no longer money but the confidence to write the firmware yourself. The bowling center still has the same 70-year-old pins and machinery — the only thing that changed was the brain.