In the late 1980s — long before the internet made networking effortless — Hal Philipp built his career the old-fashioned way: research, cold calls, and persistence. At the time, he was looking for industries that might benefit from his inventions. He combed through library directories, identified key players, and reached out by phone or letter. One of his most successful targets was the automatic faucet industry, which faced recurring problems with sensor reliability.

The pain point was clear: faucet malfunctions cost companies money and frustrated customers. Philipp’s solutions caught the attention of major U.S. manufacturers such as T&S Brass, Sloan Valve Company, Chicago Faucets, and Zurn. While not every contact became a client, the outreach yielded several licensing deals, generating a steady stream of royalty income. This licensing model suited Philipp’s vision — he wanted to remain an independent inventor, earning enough from patents to fund new projects, enjoy flexible working conditions, and explore business opportunities at his own pace.

Leaving the day job

Before striking out on his own, Philipp had worked for the National Institute of Standards and Technology (NIST) and later for Tektronix. The transition to full-time entrepreneurship took courage, though Philipp admits he approached it with what he calls “young and foolish” confidence. He knew he could always return to traditional employment if necessary, and his modest lifestyle kept expenses low. For him, the appeal was simple: create useful products people would pay for, build a sustainable income stream, and enjoy the freedom to live and work anywhere — even on the beach.

The problem of generating reliable electrical power

Philipp’s work with plumbing companies revealed a technical challenge: sensors needed to run for five years on batteries, but his optical sensor designs could last only about a year. Rechargeable batteries weren’t viable in the early 1990s, so Philipp explored alternatives — passive infrared, radio frequency, acoustic sensing — before landing on capacitive sensing.

Capacitive sensors, however, had a poor track record. They were unreliable, vulnerable to interference, and expensive. Despite the risks, Philipp leveraged his technical expertise to develop a more robust approach: the “charge transfer” capacitive sensor. By using digital switches to charge and transfer electrical charge between components, he could measure tiny changes in capacitance — such as those caused by a hand moving near a metal object — with high reliability and low cost. This breakthrough not only solved the faucet industry’s needs but also paved the way for future applications, including touchscreens.

The flash of genius

While the initial charge transfer design worked well for industrial customers, it was still too expensive for mass consumer products, costing $20–$30 per unit. The challenge was to make it dramatically smaller and cheaper. One night, as Philipp was drifting off to sleep, the solution crystallized: he could implement the entire sensing system using just an inexpensive eight-pin microcontroller from Microchip, costing only 30 cents. He could then replicate the functionality of his earlier design with minimal hardware — just firmware and a capacitor.

The next day, Philipp wrote the code, tested it, and confirmed it worked. He instantly recognized the commercial potential, and knew the discovery could make him wealthy.

Convincing the chip manufacturer — an unexpected hurdle

Philipp began selling large quantities of these programmed microcontrollers, enough to require him to buy chips directly from Microchip rather than through distributors. But when Microchip’s engineers evaluated his method, they declared it “impossible” and insisted it wouldn’t work. Philipp countered with the obvious: he was already selling thousands of units that functioned flawlessly.

In a pivotal meeting with Microchip CEO Steve Sanghi, Philipp made his case face-to-face. Despite resistance from some executives, Sanghi decided to give him a direct account — a move Philipp credits with changing the trajectory of his business. This decision allowed Philipp to purchase chips in huge volumes, customize them with his company’s branding, and scale up production.

An accidental company

At the time, Philipp was based in the UK, having moved there for a joint venture intended to market his technology in Europe. When the British partner failed to meet quality and investment commitments, Philipp reclaimed the technology. With customers already in place, he faced a decision: either abandon the market or build the capacity to serve it himself.

Operating from a rental house on England’s south coast, Philipp began hiring staff to meet demand. This marked what he calls the “point of no return” — once you have employees, you must handle payroll, corporate taxes, and all the infrastructure of a formal company. While he never intended to run a business on that scale, the situation evolved into a vicious circle where each new hire increased productivity, which fueled more sales, which in turn required more staff.

By the year 2000, Philipp sought venture capital to further expand, but investors laughed at his proposal — that’s remarkable given that he had built everything without external funding. His growth had been entirely self-financed, relying on royalties from earlier patents that provided a modest but steady base of income. Once the low-cost microcontroller design entered production, sales accelerated exponentially, transforming the business.

Lessons from the journey

Philipp’s story illustrates seven core entrepreneurial principles:

1. Find and solve real pain points – Target industries with widespread, costly problems. The faucet industry’s sensor issues created a ready market for Philipp’s inventions.
2. Recognize that persistence pays – Cold calls, letters, and repeated follow-ups built relationships before the internet made networking easier.
3. Leverage existing strengths – Philipp’s deep technical expertise in sensing technologies enabled him to improve on flawed solutions.
4. Recognize breakthroughs quickly – The microcontroller insight was immediately recognized as commercially transformative.
5. Face-to-face matters – Critical deals, like securing Microchip’s direct account, hinged on in-person meetings and reading body language.
6. Adapt when plans change – The failure of a joint venture led to building his own company, which ultimately proved more profitable.
7. Bootstrap when possible – By self-funding with licensing income, Philipp retained control and avoided early dilution of his business.

From a lone inventor making cold calls to a pioneer in touchscreen technology, Hal Philipp’s path was shaped by technical ingenuity, business adaptability, and an unwavering commitment to solving problems that mattered to customers. What began as a quest for independence evolved into a thriving enterprise — one that grew not from grand design, but from a series of smart, well-timed responses to opportunity.