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Subscribe to this list via RSS Blog posts tagged in robotics

Posted by on in Development, Software and Tools

This blog post is about determining the value of the base resistor of a MMBT3904L, which is ON Semiconductor's variant of the general purpose 2N3904 NPN  Bipolar Junction Transistor (BJT), when used as a switch. The value is determined when the transistor is in the common emitter configuration. Sounds like a simple task and so it should be too. However, as we have commented many a time in our blog posts tasks that appear to be easy never are.  Hence, while undertaking this task we decided to follow Lao Tzu's (Who? - Ed) advice, which he elegantly formulated in the following quote: 

Do the difficult things while they are easy and do the great things while they are small. A journey of a thousand miles must begin with a single step - Lao Tzu.

So, as he has suggested the sensible approach in determining  the value of the resistance of the base resistor of a BJT is to perform the calculation a step at a time, as we demonstrate below.

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Posted by on in First Impressions

To me all similarly priced servo motors look the same and promise the same performance and maybe they ought to, too. So amongst all the servos out there how do you choose that perfect one for your application? Well, I suppose that is the question that needs answering! Quite fortunately when I had to answer that question, of which set of motors to choose for the 17 Degree-of-Freedom (DOF) robot project, the Tower Pro MG996R motors came recommended, as part of the 17 DOF robot kit. Hence, these motors were thrust upon me.  

The predecessor to this motor, the MG996, did not receive the most glowing of reviews and was particularly noted for its lack of accuracy and centering. However this version is meant to be a worthy successor with a redesigned PCB and Integrated Circuit (IC) control system, which makes it more accurate. We provide an insider's view of this servo in this blog post.

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Posted by on in Robotics Using FPGAs

Hello and welcome to another post in the blog series on using FPGAs in Robotics. So far the series has concentrated on the construction of a 17 DOF robotic kit, which was purchased without any assembly instructions. This kit, when fully constructed, will be central to this series of blog posts and should be controlled using one of Altera's Cyclone family of FPGAs on  a development board or kit. In this blog post I will finish the construction of the lower limbs and add the waist bracket, which will eventually act as our Inertial Frame when the Denavit-Hartenberg parametric representation of articulated joints is considered.

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Posted by on in Dilettante Boards and Modules

This weekend, due to the beautiful weather (about 20oC, lovely - Ed), I begrudgingly continued with the assembly of the prototype 2 x 13 Way Mixed Signal Dilettante Board

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Posted by on in Robotics Using FPGAs

Bought the book "Intermediate Robot Building" by David Cook to delve deeper into the world of robotics.

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