Display-Based or Phone-Based TPMS: Which Fits Your Vehicle? Two architectures for tyre-pressure monitoring — a dedicated display or a phone app — and the honest trade-offs of each, including what a BLE system cannot do.

Two architectures, not two feature lists

Every tyre-pressure monitoring system answers the same three questions: how pressure is measured, how the reading travels, and where the user sees it. The first two are engineering problems. The third decides which product you should actually buy, because it determines who installs the system, who supports it and who owns the customer relationship afterwards.

In volume production there are really only two options:

• Display-based — the sensor transmits to a dedicated receiver with its own screen, mounted on the vehicle.
• Phone-based — the sensor transmits over Bluetooth Low Energy to an app on a phone the user already owns.

They are often marketed as if one replaces the other. They do not. They suit different vehicles, buyers and use patterns, and a supplier who says otherwise is describing a catalogue, not a solution.

What a display-based system actually contains

A display system is four things, not one: a sensor per wheel, a radio receiver, a display head, and the wiring that connects the last two to the vehicle's power. Each of those is a part number you have to carry, a part that can fail, and a part somebody has to install.

That is not automatically bad. It buys three real things:

1. Readings without a phone. The display is powered by the vehicle. Anybody who can see the dashboard sees the pressure.
2. A fixed installation. Once it is fitted, nobody has to remember anything. There is no app to open.
3. A predictable alarm path. Thresholds live in firmware you control, and the alarm is a buzzer in the cab rather than a notification on a device that might be in a jacket pocket.

The cost is equally real: wiring to route, a mounting position to find, a switched supply to tap, and a screen in a place where screens get wet, get dropped and get stolen. On a truck or a bus that is normal practice. On a scooter it is usually the end of the conversation.

What a phone-based system actually contains

A BLE system removes the receiver, the display head and the harness, and replaces them with software. The sensor becomes the only piece of hardware on the vehicle.

The gain is not only cost. It is installability: a dealer can fit two sensors to a scooter in the time it takes to change a valve cap, with no cutting, no tapping and no dash real estate.

But the phone is now part of the product, and that has consequences worth stating plainly.

The BLE trade-offs, stated honestly

This is the part of the comparison most product pages skip.

• No phone on the vehicle means no live display. A BLE sensor broadcasts; it does not hold a screen. If the phone is in a bag, switched off or left at home, the rider sees nothing until it comes back into range. The sensor keeps measuring — but nobody is watching.
• The link is still a link. 2.4 GHz is a shared band. A phone charging behind a metal fairing, or Bluetooth switched off, produces a gap in the data. Good apps show a missing reading as missing; bad apps keep showing the last known value as if it were current.
• The phone becomes a single point of failure. Battery flat, operating system updated, permissions reset, app uninstalled — any of these ends monitoring. A display-based system does not care about any of them.
• Somebody has to install an app, and somebody has to keep it updated. For a private rider that is trivial. For a commercial fleet with rotating drivers, it is a training and compliance problem.

None of this makes BLE the wrong choice. It makes it the wrong choice for certain use cases, and the honest position is to name them out loud.

Choosing between the two

Question	Points to display	Points to phone
Is there a permanent supply and somewhere to mount a screen?	Yes	No
Does the vehicle have a cab or a dashboard?	Yes	Rarely
Will the operator carry a phone anyway?	Irrelevant	Yes
Must monitoring work with no phone present?	Yes	No
Are installation space and time the main constraint?	No	Yes
Do you want the end-user relationship inside your own app?	Not applicable	Yes

The pattern is consistent in practice. Commercial vehicles, buses, trucks, trailers and machines that already have a cab are display territory. Two-wheelers, scooters, light three-wheelers, quads and rental fleets are phone territory, because there is nowhere sensible to put a screen.

There is a middle case too: a BLE sensor can feed both an app and a small permanent display, provided the supplier is willing to open the protocol.

What the sensor itself has to do

Whichever architecture you choose, the sensor is the part that has to survive the vehicle. The published figures for our BPU100 are:

Item	Specification
Bluetooth protocol	BLE 4.1
Operating band	2400 MHz – 2483.5 MHz
Transmit power	3 dBm
Air data rate	1 Mbps
Receiver sensitivity	−95 dBm @ 1 Mbps
Power	CR1632 coin cell, replaceable
Operating temperature	−20 °C to +80 °C
Storage temperature	−40 °C to +85 °C
Operating humidity	5% – 95%, non-condensing
Sensing element	Infineon

The battery line matters more than it looks: a replaceable CR1632 in a sensor that does not need re-pairing after the swap turns the sensor into a maintained part instead of a disposable one.

How to frame the decision

If you are an OEM, a distributor or a fleet buyer, the useful question is not which technology is more modern. It is which one your customer will actually use. A display nobody wires in is worse than an app everybody installs.

Ask three questions about the vehicle and the user, then choose:

1. Where does this vehicle keep its power, and is there a legal, visible place for a screen?
2. Will the person operating it have a charged phone within a couple of metres on every trip?
3. Who is expected to answer the phone when something does not work?

If you want the two architectures compared against one specific vehicle, tell us the vehicle and the market and we will say which one fits — including when the answer is the architecture we did not originally propose.

We build both. The BLE sensor described above ships at more than 10,000 sets a month into the Chinese two-wheeler aftermarket, with capacity of 30,000 sensor units a month. Certification is handled per market and per project, so the approvals that apply to your destination are a project question rather than a catalogue line. More background is on the about page, and the documentation is on the downloads page.

FAQ

Does a BLE TPMS work if the rider does not carry a phone? No, not for live readings. The sensor still measures and broadcasts, but with no phone in range there is nothing to display the value and nothing to raise an alarm. If monitoring must work without a phone, a display-based system is the correct architecture.

Can one sensor support both a display and an app? That depends on whether the supplier will open the protocol. Our BLE service and data format can be adapted for OEM programmes, which is what makes a dual-path design possible. It is a project conversation, not a catalogue option.

Is a phone-based system less accurate than a display system? The measurement happens in the sensor, using the same sensing element, in both cases. What differs is the delivery path. Accuracy is a sensor question; availability of the reading is an architecture question.

Which architecture do you recommend for a scooter? Phone-based, almost always. There is rarely a sensible place to mount a screen and rarely a switched supply to tap. Where an owner also wants a permanent readout, the answer is usually a small display fed by the same sensor — again, a protocol question for the supplier.