## April 2017 Chennaipy Meeting Minutes Vijay, the organizer, welcomed everyone and started with an introduction on what a meetup is and isn't. That it is not a training program but a place to meet people and exchange ideas. He introduced the first speaker.
### Talk 1 - Module development for wireless systems using Python Speaker - Ashok Govindarajan Ashok started with an introduction to the terminologies used in mobile data technologies such as 4G, uplink and downlink. He explained how calls go from sender to receiver through the network. He then demoed a module written in python that simulated the downlink part of the call flow. The module demonstrated how many bit errors can occur when the signal to noise ratio and the number of subcarriers are varied. He used Matplotlib to display a graph representation comparing the transmitted and received signal. Other libraries he used included Numpy and Scipy. He concluded by explaining his intention of developing educational material for ECE students for explaining the concepts touched upon during his talk. We broke for networking and tea for fifteen minutes. ### Talk 2 - Introduction to Statecharts Speaker - Vijay Kumar Vijay began by talking about breaking down complex problems into a number of simple problems to reduce the probability of error. He explained how state diagrams can help in this matter. He demonstrated a program that turns a lightbulb on and off to explain state diagrams. He used the Sismic framework for describing the state diagram using YAML and used the GTK+ library for simulating a lightbulb. He further talked about how state diagrams can become very complex for large problems and promoted state charts as the better solution for such cases. He talked about the different types of state charts, backed up by more demos of toggling multiple light bulbs. He ended the talk with some recommendations for resources for further study. ### Lightning talks One audience member spoke about how he was now finally able to understand state machines despite having some experience with it in Matlab. Another member spoke about using scripts to automate email sending and Facebook "thank you" comments. A couple of the members came up to say how thankful they were for the meetup and how useful they found it. One last person came to talk about how useful hackathons are when it comes to forcing yourself to try and learn new things. He informed the audience about a hackathon being conducted on May 5th by Freshdesk called "Save the Hacker". The meetup concluded with Vijay giving thanks to the venue and tea sponsors as well as to the speakers and the audience. A group photo was taken.
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