The scanning tunnelling microscopes have become the eyes of the scientists, a necessary and essential tool in the laboratories of education and research for the characterization of nanoscale. This article presents the basics of a tunneling microscope that have allowed scientists the visualization and modification of nanoscale surfaces. A methodology for the correct visualization and characterization of surfaces is described using the implemented instrument, reaching the bidimensional quantification of characteristics. This methodology, determined experimentally, takes into account critical parameters for stabilization of the tunnel current, such as the scanning speed and the geometries and dimensions of the microscope needles.
Figure 1: Relief of two complete 7 x 7 unit cells in 1982 
Continue reading “Scanning Tunneling Microscopy: The new eyes and hands of the scientists”
Also called ΔΣ-converter or ΣΔ-converter, this is one of the most used method to get high resolution analog to digital converters (ADC) at a certain speed. This is included in many microcontrollers displacing the typical SAR standard converter. Continue reading “Delta-sigma (ΔΣ) and SAR as standar ADC converter in microcontrollers”
I recently noticed that my diplom thesis is available online on the university repository.
Continue reading “My Final Thesis about Multicopter”
This low range sensor is widely used on robotics. The datasheet of CNY70
can be found on the Vishay website.
Hier I show how to connect a CNY70 sensor in order to obtain an analog otput proportional to the observed colour.
Continue reading “How to connect the Cny70 Sensors”