Solar power for your arduino – load

pv-arduino-1A standalone PV system begins with thinking about the load. So let’s talk about our load: The characteristics of the load determine all the components of the PV system because it must be designed to feed the load so that everything works the way we want it to.

In the first part of this article we will talk about choosing the appropriate system voltage. The second part is about how much electricity is consumed and how to optimize the system in a way that it needs less energy but still is fully functional.
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Solar power for your arduino – basics

pv-arduino-1You can power your arduino from the grid, from a battery and also with solar energy. Building a standalone photovoltaic (PV) system for your application is just about choosing the right components and connecting them with a few wires. What you need is a PV module, a battery and a charge regulator to get your arduino project running offgrid. The system basically is the same as if you would build offgrid PV for e. g. a caravan, a weekend home or a small house. Here we will scale this down for our arduino needs. Continue reading

Make your own winding machine

coilOften coils have to be custom made for your application. I started making my first coil by simply taking a bobbin and wire and winding the coil by hand (see left). This can be a very boring job. So it was time for a simple winder that is cheap and easy to build. I didn’t want to wind by hand and count the windings in my head any more. So the winder had to have a motor, a rotary encoder and an arduino to do the counting job. Continue reading

Make your own quadrature rotary encoder

quadrature_encoderIn this post we will add a second photointerrupter to our rotary encoder. This will give you information about the direction your rotary device turns. So you will be able to count forward and backword depending on the turning direction. This is necessary e. g. for many positioning application. The encoder we will make is also called a quadrature encoder. Continue reading

Make your own rotary encoder

In the first and second post of this series you saw the basics of how to use photointerrupters. Now it’s time for practice. We make a rotary encoder. Here we take a single photointerrupter that gives us the pulses we can count. In a later post we will take two of them to get information about the direction of rotation. But now let’s start with the simple version.
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photointerrupter schematic details

photointerrupter_wiring_generalIn my second post about photointerrupters I show you how to get things working properly and how to spend only as much energy as necessary. The schematic diagram shows the basic wiring for a photointerrupter like the TCST 2103 that I introduced already in my first post. Now it is time to find the best values for the two resistors. Continue reading

connecting an arduino with a LM35 temperature sensor – special issues


National Semiconductor

So this is a very easy one – most of the time. There are already many blog posts and forum posts about connecting a LM 35 temperature sensor to an arduino like here, here or here. So why writing another one? When beginning with my LM35 I thought the same and this is why I decided to take this special sensor. But things don’t always work as easily as it looks from a distance. There are some details I found and this is why I write this post. Continue reading