New Voldeno 1-Wire Temperature Sensor – Compact, Reliable, and Built for Large-Scale Installations

When designing modern building automation systems, it’s often the smallest components that make the biggest difference. One common bottleneck is temperature sensing on large 1-Wire networks. The more sensors you add, the higher the chance of unstable readings and voltage drops – especially with parasite power and frequent polling.

We ran into this issue during our own closed-system deployments. We needed a compact, stable 1-Wire temperature sensor with external power support. When we couldn’t find one that met our needs – we built it ourselves.

The SEN1WT3 is a digital thermometer based on the proven DS18B20U+ chip. With 3-wire operation and external power input, it’s engineered to work reliably in demanding setups – even with 20+ sensors on a single bus. Its miniature size allows for easy installation inside a standard electrical box, like behind a light switch, with no soldering or tools required.

Key features:

External power support – No voltage drop issues in large installations

Ultra-compact – Only 23 × 13 × 5.1 mm

Quick, tool-free installation – Adhesive mounting + push-in terminals

Full 1-Wire compatibility – Works with any 1-Wire controller

Accurate readings – ±0.5°C in the -10°C to +85°C range

Below, we show one of the most common use cases – installed neatly inside a wall box. This setup has proven to be effective in our own smart home and building automation systems, combining reliability, fast deployment, and discreet aesthetics.

Installers love it because it just works – whether you’re automating a single home, an office space, or a full apartment complex.

We’ve made it available to other integrators and developers facing the same challenges.

If you need a smart, simple, and robust way to measure temperature across your system, SEN1WT3 may be your new favourite sensor.