Gypsum Sensors Completed

So I went a slightly different route to build the soil moisture sensors as I wasn’t having much luck with the drinking straw method (too fiddly).

My solution was to drill a hole between two pieces of MDF with a flat bottomed forstner bit and then to drill two smaller holes into the bottom of it where the wires would go.

The two pieces clamped together made a really nice mold for the plaster of paris and I could ensure that the wires were a consistent distance apart. I covered the surfaces with vaseline so that the two sides of the mold would seperate easily.

I’ll post pictures of the sensors later today. But it worked really well.


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