Latest / Hardware Startups with Fexingo: Devices, Robotics, and Manufacturing Tech Companies / Ruggedizing Consumer Hardware for Harsh Environments
Transcript
- Lucas: So I was reading about the new handheld terminal that a startup in Colorado is shipping to oil field workers, and the spec sheet is almost boring until you notice the operating temperature range: minus forty to plus eighty-five degrees Celsius. Luna: Minus forty? That's not just cold, that's 'your phone shuts down at zero' cold. Lucas: Exactly. And that's the thing about rugged hardware — it's not one feature, it's a whole set of decisions that most consumer devices never have to make. The phone in your pocket could never survive that, and it's not just about the battery. Luna: So where do you even start when you're designing for that kind of abuse? Lucas: The first thing is you have to decide what 'rugged' actually means for your use case. There's a huge difference between a device that lives in a warehouse and one that gets dropped into a muddy trench. And that decision drives everything from the enclosure to the connectors to the conformal coating on the circuit board. Luna: And that's where IP ratings come in, right? Like, IP67 is the gold standard for phones. Lucas: Right, but IP ratings are often misunderstood. IP67 means fully protected against dust and can survive immersion in one meter of water for thirty minutes. But in the field, you might not need full immersion — you need protection against high-pressure water jets, which is a different rating. IP69K, for example, is for wash-down environments like food processing plants. Luna: So you're saying the rating should match the actual environment, not just the marketing. Lucas: Exactly. And that's a trap a lot of startups fall into — they over-spec the rating and end up with a bulky, expensive device that's overbuilt for the real use case. The key is to define the exact conditions: dust, water, temperature, impact, maybe salt fog if it's coastal. Luna: And once you've defined those conditions, how do you actually achieve them? Is it all about the enclosure? Lucas: The enclosure is a big part, but it's not the whole story. The electronics inside need protection too. That's where conformal coating comes in — a thin polymer layer applied to the circuit board that protects against moisture, dust, and even corrosion. It's like a raincoat for your PCBA. Luna: But I've heard that conformal coating can be tricky to apply — especially if you have components that generate heat. Lucas: That's right. Coating can insulate heat and cause hotspots, so you have to mask certain components or avoid coating them altogether. That's why some startups choose potting instead — completely encasing the electronics in a resin. Potting offers excellent protection against vibration and moisture, but it's nearly impossible to repair if something fails. Luna: So it's a trade-off between repairability and protection. For a field device that might be in service for ten years, that's a big decision. Lucas: And that's where the economics come in. A consumer device is designed for a two-year lifecycle. A rugged device is often designed for a ten-year lifecycle. That changes the component selection, the testing, and the expected failure modes. You're not chasing the thinnest, lightest design — you're chasing reliability over time. Luna: And that's also where the connectors come in. A micro usb port is going to fail pretty quickly in a dusty environment. Lucas: Connectors are often the weakest link. You need sealed connectors with proper ip rated mating, and you need to think about how many mating cycles the device will see. A surveyor might plug and unplug a cable fifty times a day, so you need a connector rated for tens of thousands of cycles, not just a few hundred. Luna: And what about thermal management? I imagine that's a challenge when you're dealing with extreme cold as well as heat. Lucas: Actually, cold is often harder than heat. Batteries lose capacity at low temperatures, and LCD displays can freeze and crack. You need heaters for the display and maybe for the battery, and that draws power — which is ironic because the battery is already struggling in the cold. So you have to design the power budget carefully. Luna: And that's why those oil field devices have such a wide temperature range — but it's not just about the battery, it's about the whole system. Lucas: Exactly. And when you're designing for those extremes, you also have to think about thermal cycling. The device goes from a hot truck cab to a freezing night on the well pad, and that expansion and contraction can cause solder joints to crack over time. That's why you need to do thermal cycling tests during development. Luna: So testing is a huge part of ruggedization. But how do startups validate these designs without spending a fortune on certification labs? Lucas: That's a great question. The first step is to do your own pre-compliance testing. You can do basic IP tests with a simple drip tray or a dust chamber you build yourself. We talked about pre-compliance testing for certification in an earlier episode, but it's even more critical here because the environmental stresses are so much higher. Luna: And you can also use accelerated life testing to simulate years of use in a few weeks. Lucas: Right, and we covered that too. But the real challenge is knowing which tests matter. For a rugged device, you might prioritize drop tests, thermal cycling, and salt fog exposure — depending on the environment. You don't have to test everything, but you do have to test the conditions your device will actually see. Luna: And I guess that's where a lot of startups go wrong — they test everything and end up over-engineering the device, which drives up cost. Lucas: That's a common failure mode. And speaking of cost, listeners have been asking how they can support the show. If you've been getting value from these episodes, and you want to keep them free, you can buy us a coffee at buy me a coffee dot com slash fexingo. Luna: Yeah, it's a small way to keep the podcast running and help us cover topics like this that matter to builders. Lucas: Now, back to those economics. Over-engineering isn't just about cost — it's also about weight and size. A device that's too heavy or too bulky is harder to use in the field, and that's a real problem for workers who have to carry it all day. Luna: So it's really about finding the sweet spot between protection and usability. Lucas: Exactly. And that's where design for assembly comes in. You want to minimize the number of seals and gaskets, because every one is a potential failure point. Instead of having multiple gaskets between different parts, you can design a single-piece enclosure that seals the whole device. That also makes assembly easier and reduces the risk of installation errors. Luna: And what about the actual components? Are there specific parts that are more rugged than others? Lucas: Yes. You want components with extended temperature ranges — so-called 'industrial grade' instead of 'commercial grade'. They cost more, but they're tested to work at higher temperatures. And for connectors, you might choose locking connectors that are less likely to come loose under vibration. Luna: And don't forget about the display. A lot of rugged devices still use transflective LCDs that are readable in direct sunlight — that's something a standard phone screen can't do. Lucas: Great point. Sunlight readability is a major factor for outdoor devices. And that's why you see companies like Panasonic with their Toughbook line, or Trimble with their surveyor handhelds — those are the reference designs that set the bar for ruggedness. Luna: So for a startup, is it realistic to compete with those incumbents? Or is there a niche for new players? Lucas: There's definitely room. The incumbents are often expensive and not very flexible. Startups can offer modular designs that let customers upgrade components without replacing the whole device. That's a value proposition that larger companies sometimes struggle with. Luna: And I guess with modular design, you can also extend the life of the device by swapping out the battery or the radio module. Lucas: Exactly. That's a big selling point for customers who don't want to replace a rugged device every couple of years. And it ties back to the supply chain — if you standardize your connectors and modules, you can adapt to component changes without a full redesign. Luna: So what's the one thing you'd tell a hardware startup that's about to start designing their first rugged device? Lucas: Start with the environment, not the product. Define the worst-case conditions your device will face, and then design to meet those conditions — nothing more, nothing less. That's the difference between a rugged device that's a joy to use and one that's a brick. Luna: And if you get it right, you've got a device that can survive the real world and still be profitable to manufacture. Lucas: Exactly. It's a discipline that pays off in the field, and in the financials.