A sample text widget

Etiam pulvinar consectetur dolor sed malesuada. Ut convallis euismod dolor nec pretium. Nunc ut tristique massa.

Nam sodales mi vitae dolor ullamcorper et vulputate enim accumsan. Morbi orci magna, tincidunt vitae molestie nec, molestie at mi. Nulla nulla lorem, suscipit in posuere in, interdum non magna.

Testing Testing Testing … Smoke ’em if you got ’em.

The component side of the Thermistor Board.

Sooner or later there comes a time… a time when you just got to plug it in and find out if it is going to work. Hence my title “Smoke ’em if you got ’em”. Success, no smoke came out. However,there has been more than one problem.

Continue reading Testing Testing Testing … Smoke ’em if you got ’em.

Making our Electronic Masterpiece

The Final Thermistor Circuit.

The hard part of our electronic design is over… Well sort of. We are just moving into a new phase of it, but at least we will not be talking theory. Finally we are actually going to mount parts to something and start thinking about how we will get it

Continue reading Making our Electronic Masterpiece

Learning the Arduino – The thermistor circuit.

Block Diagram of the Thermistors.

Way back there in November in a post called “Goals of Calibration of the Thermistor Circuit“, I used the diagram to shown in picture 1 to explain how I intended to linearize and calibrate the thermistors. I made one almost fatal mistake…I changed my mind. Seriously, I had intended

Continue reading Learning the Arduino – The thermistor circuit.

The Thermistor Circuit and Zener Diodes.

The Thermistor Circuit.

The thermistor circuit is complete! There are a few resistor values I want to check before I show all of of the values, but essentially the circuit is complete. This circuit will do everything we described in the last thermistor post, “One More Step Closer to Completing the Thermistor Circuit”. There

Continue reading The Thermistor Circuit and Zener Diodes.

Modeling the Thermistor.

Steinhart-Hart thermistor equation

What is a model? Without taking the time to look up an official definition, I would say it is a representation of reality. (I am sure some women would like to argue that point with me, but when I wrote the definition, I was not thinking of THAT kind of model!

Continue reading Modeling the Thermistor.

Goals of Calibration of the Thermistor Circuit.

Block Diagram of the Thermistors.

Tonight is time to zoom out and look at the block diagram of the thermistors. When drawing a CAD drawing it is necessary to sometimes zoom in and work with details and sometimes necessary to zoom out and look at the overview. When designing parts of a process to

Continue reading Goals of Calibration of the Thermistor Circuit.

Linearizing our Thermistor.

The first part of our Thermistor Circuit.

We are not to the end of talking about the thermistor yet but we can see the light at the end tunnel. Last night’s post “Principles of linearization” was a long one with lots of math… tonight’s post is relatively short and mostly pictures. I think we

Continue reading Linearizing our Thermistor.

Principles of Linearizing the Thermistor.

Thermistor Resistance vs. Deg F.

Tonight we are going to take our first steps toward making that scary looking exponential curve of the thermistor resistance into something we can use. The plot show in the first picture is the one we created in “Our First Look at Thermistor details” and was created by simply

Continue reading Principles of Linearizing the Thermistor.

Analog to Digital Conversion

A 4 bit SAR A to D convertor.

Today we are making a slight turn from the analog world into the digital world. Computers are nice when it comes to crunching numbers and recording data, but somehow we have to get those real-world values into the computer. The device that does that is called

Continue reading Analog to Digital Conversion

Summary of the standard op-amp amplifiers

The Op-Amp Circuits under test.

We have went through a lot of information about the standard Op-Amp amplifiers so before going on and complicating things even more it is time to summarize what we have learned. To keep things as practical as possible I will do this from the point of view of the

Continue reading Summary of the standard op-amp amplifiers