Back to the Breadboard

So, it turns out there’s such a thing as a pull-up resistor that pulls a pin away from ground so that when the pin is shorted to ground using, say a micro-switch connected to a valve rope on a water tower, the microcontroller can detect the change. Without the pull-up resistor, the input is said […]

Productive Group Modelling Night

For about a year, the local NMRA division has hosted a group modelling evening. Despite it being only ten minutes’ drive for me, my calendar never seemed to line up. This Friday I finally made it. I brought along the soldering iron and the project board for the water tower, and wound up wishing I’d […]

Water Tower Circuit

The breadboard for the water tower has sat on my desk long enough that it finally transcribed itself into a diagram to start making the circuit permanent. Despite the apparent complexity, it is in fact just four simple circuits mediated by software in the microcontroller: I’m certain this could all be achieved with hardware, but […]

Water Tower Animation

The gubbins for the inside of the water tower have come together at last. Once the noise maker was working, it was a straightforward matter of programming to make it all work – at least in the unit and integration tests! When I went to upload it to the board, however, there were still some […]

Water Tower to get Noisy

After almost two weeks of avoiding manuals, while scanning blog posts and speed-watching the occasional tutorial, the speaker attached to the DF Player Mini attached to the ESP32 board burst into song! Along the way, I procured more bread boards because the ESP32 is too big to fit on a single one and allow connections […]

Engine sand

Even today, locomotives want a small amount of dry sand for traction. All my resources are tacit about where they kept engine sand in Pembroke in 1905. There is also zero information about the purpose of the third stall in the roundhouse. For years, I’ve thought there was probably a pile of sand somewhere and […]

Roundhouse Gets a New Floor

I’ve never been happy with the roundhouse floor. Being made from a thick layer of ballast, it was not flat, and some of the rocks were real ankle-turners. As a result, details like work benches and water barrels were crooked. As I had the roundhouse module off the layout to protect it while working on […]

Water Tower Complete

I think we’ll call the water tower complete for now. I wound up printing the ladder so I could get round rungs without losing my mind drilling holes. The wooden supports for the ladder are quite delicate, and the ladder just lies in there loose so I can remove the roof and mess with the […]

Water Tower Tank

Now we get to the meat of the matter: the tank is usually considered the hardest part about building a water tower. In my case, the hard work was mostly done in OnShape. The prototype tank in Wakefield has two different types of band connectors, and they are in different orientations. I copied these differences […]

Spout Installation

It took two attempts – the first with epoxy, and the second with CA – to get the spout and frame mounted on the base. The epoxy didn’t work out because even with help from my darling wife, I wasn’t able to clamp it where I wanted it. With CA, I could hold it by […]