Ever since Elektor Electronics published the 400-Watt Laboratory Power Supply in October/November 1990, I have always had a fascination with the circuit and a desire to build it. These magazines were one of the first Elektor issues I received as a kid and this design became one of the first complete circuits that I analyzed […]
This month, Iowa Scaled reached a new milestone – we have our first ad in a major publication! We’ve decided to start advertising our MRServo products and wireless fast clocks in the most read model railroad publication – Model Railroader magazine. So, to welcome our new customers, we want to help you out with little […]
Even before actual silicon was for sale, Michael and I have been wanting to try the AS3935 “Franklin Lightning Sensor™” from ams AG (formerly austriamicrosystems AG). It comes in a very inconvenient MLPQ-16 package, and requires an on-board antenna, so it was a natural for a breakout board. It’s been on the back burner for […]
A couple weeks back, I removed the old staging yard from my layout in the process of tearing out the old to make room for my new layout. I didn’t need it for the new layout, so we decided to repurpose it for writing an article on complex turnout control using MRBus. It was built […]
About a year ago, our freezer started generating excessive moisture inside, to the extent that, when the defrost heater was active, water would drip from some of the shelves and, worse yet, cause the ice drawer under the ice maker to freeze into a solid mass of ice. We lived with it while trying a […]
We’ve received a number of questions now about hooking MRServo switch machines up to Digital Command Control (DCC) stationary (aka accessory) decoders. It’s not as simple as one might think.
One of the original applications I had in mind for MRBus was monitoring a compost pile I build each spring using manure from our horses. In early summer, pumpkins are transplanted into the pile and do remarkably well. In fact, I discovered this by accident one year – some pumpkins one fall were added to […]
Single-point calibration of the RTS node is easy to perform. One method is presented here using the water ice-point and works with both waterproof and non-waterproof temperature sensors. The RTS firmware provides both offset and gain calibration coefficients. For most purposes, a single point offset calibration is probably sufficient. To accurately perform both gain and […]
Simple P-N junctions, as found in bipolar transistors, exhibit a very useful property that can be used to measure absolute temperature. When biased at two different currents, the difference in voltage across the P-N junction is linearly related to absolute temperature, with little dependence on semiconductor process variations.