Building temperature probes

As a long time fan of the 1-wire bus, and due to its integration on the Raspberry Pi chipset, I decided to build some probes for the jacuzzi.

Waterproof probes

The idea is taken from this DIY waterproof probe based on the DS18B20 1-wire sensor. I tried to keep it small, so I choose a Bic pen tube as the container.

First temperature sensor embedded in a pen tube
First temperature sensor embedded in a pen tube

Unfortunately, the diameter of the tube was too small and the sensor was not correctly immersed in silicon. For the second edition, I used a pen tube from our university… Now I have nice probes that are really waterproof, but a bit larger than the first try.

Second revision of an embedded temperature sensor in a pen tube
Second revision of an embedded temperature sensor in a pen tube

Inline probes

To measure temperatures in the cabin, outdoor and on the heater circuits, I needed some probes that I could chain together. For these ones, I used RJ45 female adapters and put the sensor inside the case. Both sides of the adapters are wired together, so it’s quite easy to solder a sensor between the RJ45 sockets.

Temperature sensor embedded in a double RJ45 adapter
Temperature sensor embedded in a double RJ45 adapter