Author Archives: Ranjith

Constellation

-Ranjith, sanjeev, saranya, and Logeshwari

In this week sleep over, children wants to see a moon in telescope. we setup the telescope, but we did not see the moon in our telescope. Then two persons came from Puducherry science center & Planetarium and they tried on telescope. They found out there is some parallax error in telescope and all of us get disappointed. One person from planetarium show us group of seven stars { ( hindu astrology: saptarishi mandalam ) , ( astronomy: Big dipper ) } and told us name of stars in that constellation and way to find the north pole using pointer star on Big dipper constellation. After that we all went to terrace to see more constellation and he show us Leo Zodiac constellation, and children ask him to show Libra and Cancer zodiac constellation, but we can’t see that. Then children ask him why there is not star. He explained that, there is stars but we can’t see due to light pollution ( bright moon light ). After that he show us presentation which consist of information about constellations, Galaxy, and life cycle and star ( change in color over it life time ).

EV3MEG Robot

In Saturday of this week in Isai ambalam school, students are doing different tasks. One group of students was building EV3MEG robot using Build a Robot documentation of MINDSTROMS EV3. The day before (Friday) students had partially completed the Robot structure. Remaining structure of Robot is finished on Saturday and they played with a Robot manual by controlling motors on EV3 brick. Students felt it is annoying and they want It to do task automatically by programming. But there is problem in a laptop which was used to program it. Then they found out LEGO MINDSTROMS commander mobile app with help of volunteer in their school. Using the mobile app (which had GUI mode)  they created GUI command for controlling motors and they connected their Robot with mobile app using Bluetooth and presenting their Robot to all students and teachers in school.

 

designing 4-bit microprocessor using magic tool

I started designing 4-bit microprocessor in magic tool, it consists of three block:

  • 4-bit full adder
  • register to store an input data.
  • 4-xor gates and one carrier input is used to 2’s complement for subtraction

Inputs which are used in it :

  • two 4-bit data A and B
  • carrier input
  • clock

 

 

In this microprocessor, the adding operation is takes place when carrier input is 0, and the subtraction operation takes place when carrier input is 1. During subtraction, one’s complement block takes one’s complement B data and it send to 4_bit adder. The carrier input value is 1 at subtraction. so it’s form two’s complement of B data in 4-bit full adder.

And also sanjeev taugth me, to align block in order to reduce area and to create data bus with multiplexing two inputs.

scratch programming for teaching physics concepts

I started to learn a scratch program software to create interactive model for learning. Then I got a task to create a model for: How pressure of gas change with respect to temperature and volume to container: I chose to represent it using Scratch. Initially, I had a problem on bouncing of gas molecules with same angle when it hit the wall of container. Then sanjeev helped me to solve it. In the model, I scaled the pressure in range of 0 to 150 and temperate in range of 0 to 300. But it didn’t give exact value of pressure for given temperature ( I will figure out it soon), because main goal of this model is show how pressure (no. of hit in wall by gas molecules) is affect by temperature and volume. I shared the model in scratch.mit.edu website. click this link to see the model https://scratch.mit.edu/projects/205711792/

Oven wall EBD with children

– Ranjith

I’m back after two week gap, I notice lot of things happened here in two weeks.

I worked on an EBD (Education by Design) project with children in Isai Ambalam School. They had built a red mud and brick oven, but are concerned that in the rainy season the red sand get eroded by water. They want build a short wall to protect the oven from flow of the water during the rains.

Now they are in the process of cleaning and breaking and making the floor plain to raise a wall from there. It was amazing experience with children and they are eager to finish it soon.

In this week, I learned many more things including

  • A tool called magic used for VLSI layout. I did the layout of an Invertor, NAND gate. Then I learned how to create a hierarchy and import a NAND gate layout and use it to create XOR gate by wiring using different layers of metals to avoid a short circuit.

My first experience in stem land as volunteer

Jan 22 is my first day as volunteer in STEM land. On that day, we attended the stewardship workshop along with the children in Udavi. The first session was on sourcing inner power where I was able to process my stand and fear. I noticed that my stand  supports me, when I face failure and losing something. I have also got an answer of why I am in STEM land.

The next day at isai ambalam school, i figured out that i want to learn more about who i am and what makes me complete being. In afternoon, we had a meeting with heidi regarding regarding the research papers based on what is done in STEM land. During the session she taught us  how we could conduct an effective survey with the children. Then i learned to display names using 7-segment LED displays and to blink them using astable multi-vibrator.

On Jan 24th and 25th we went to Indira Gandhi higher secondary school for Learning festival. I felt really happy when i was helping children to display their names using 7-segment LED displays. Initially  some children didn’t understand english and were not interested in it. I guided them step by step in their mother tongue. Then they showed lot of interest and become familiar with me. At end of each session, all childrens are able to display their names using 7-segment LED displays and also understand, why human get stock when they touch power cable in their house but not with TV remote battery. They learned how resistor controls current in circuit with analogy of rubber shoe while working with power line. Finally they became expert in displaying their name in LEDs and they became teachers for their teachers.