Presenting an online calculator to perform all the calculations you would require to build an “isosceles” barn door tracker. Especially useful if you are not following any traditional designs available on the internet. You can also use this calculator to see the relationships between the various parameters which control the barn door tracker. Please note that all the calculations are in metric units (mm). You can use imperial units (inches) as long as use the same units in both “arm length” and “pitch”
In the calculation, we double the required pulse frequency to be generated by the micro controller. This is because we will be using the same timer to set the pulse port ‘on’ and ‘off’. The time between two ‘on’ signals will be half this doubled frequency’s time period (technically time between two low to high transition edges). It is self explanatory from the figure below.