redhatofficial / co.lab

An open source repository for the learning materials that are used by the CO.LAB program.

CO.LAB

CO.LAB is Red Hat and open source in action. CO.LAB teaches students how to work together to solve problems, share new ideas, and to create collaboratively out of a shared experience.

The goal of CO.LAB is to introduce young people to the principles of open source -- and to a world of technology and collaboration that they may not have otherwise considered. Collaboration is a powerful driver of innovation and discovery, and open source methodology is a key part of STEAM (science, technology, engineering, arts, and mathematics) education. Empower your young people with collaborative skills that will help them succeed in their pursuit of science, technology, engineering and math careers.

For more information, see: https://www.redhat.com/en/open-source-stories/colab

This repository is intended to be a home for the curriculum, materials, and source code that make up our CO.LAB experiences. We invite you to collaborate with us to improve, evolve, and grow this initiative.

• Poetry on Pi (PoetryPi/)
  This curriculum provides an introduction to electronics, powered by Raspberry Pi and Python. Students create their own touch-screen powered digital cameras, then work together as a group to take and curate pictures that are inspired by a poem. The focus is on collaboration and appreciation for the value of technology in solving problems and creating art.

• Breaking the Code (BreakingTheCode/)
  This curriculum uses paper circuits and microcontrollers to create an interactive "code book". Students get a basic introduction to circuit design, and collaborate to complete all of the pages for a physical book, with 3d printed covers. The focus is on collaboration, empowerment, and problem solving.

co.lab's Issues

Explaination of the H-bridge is not really correct

In the document to build the robot, it describes the H-bridge is as device "to determine the direction" IIRC. this is however not correct. Since "determine" has two meaning, it can be mistaken to be like a sensor (ascertain) instead of the cause (control) meaning of this word.

An H-bridge is an arrangement of transistors in an H-like shape that is possible to drive more current. I am not sure about the whole construction of the motor/servo board, but my guess it uses a PCA9685 PWM driver to control mutliple servo and a set of motors. Unfortunately, pins on the microcontroller or the PWM driver can only source abut 15 to 25mA of current. Enough to light an LED, but not enough to drive a motor. Since in the kit they used the TT style motors, about 1.7A is the maximum draw of current to be expected.

Therefore the board uses an H-bridge chip to take the signal and 'boost' the voltage (using an arrangement that allows the drive input to switch a connection directly from the battery to drive the motor. The signal allows the contacts to be switched in polarity This way more current can be provided and the direction can be changed. So, the explaination should be to "an H-bridge is to control/switch/drive/run the motors forwards or backwards".

mod_cluster project presentation is dated

mod_cluster is listed on a legacy page nobody has updated in many years:

Project name	Project website	Category
mod_cluster	http://mod-cluster.jboss.org/	Middleware

Please, amend it to our current presentation we are replacing the old one with:

http://modcluster.io

and for CI and builds:

https://ci.modcluster.io

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