• Ultrasonic Receiver Circuit

    I wish to build the Arduino ultrasonic receiver circuit in the attached photo.  The circuit is in the book Arduino Circuits & Projects Guide (http://www.amazon.com/gp/product/1907920250?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s03).  The…

  • Some thoughts on the last inventor kit from SparkFun

    https://www.sparkfun.com/products/13271?utm_source=SparkFun+Customer+Newsletter&utm_campaign=5582a812a4-June19_newslette…

     

    What shown in the link above is essentially what is shown in the image below:

    I have done a small test about its content:

    The main…