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Sixth Sense Design Challenge

25 posts
1.     The Wheels 2.     The Axles 3.     The Bearings 4.     Basic Chassis 5.     Drive System and Pulley 6.     Motor Test with L298 Module (and Ardunino Uno ) 7.     Next Steps for blog #5 Welcome to blog #4 on R2B4 which brings together all the bits I've been thinking about and calculating into a series of photos showing the ...
This blog describes assembly and testing of the TE Connectivity magnetic angle sensor. The circuit design was described in a previous blog. The PCB arrived a couple of weeks ago, but I had to wait for parts to build it. I had ordered parts from Newark using a shopping cart I won in a Project14 contest. They came in this week accompanied by an $18 shipping charge but I am now able to assemble these cards. Here is what it looks like. Note the sensor chip is on the underside of the card to allo ...
I finally received enough parts to assemble the load cell signal conditioning circuit board. The TE Connectivity load cell will be used to measure the amount of fluid in the Graffitibot reservoir by weighing it. It isn't clear which variant of load cell (in terms of full scale output) I have, so I will have to hook it up and see what the output looks like. Also I am not quite sure how to mount the load cell - there are no obvious mounting fasteners, so I will have to test how it responds to f ...
  1.     Overview 2.     Motor Traction 2.1     Calculation of Motor Traction 2.2     Traction Summary 3.     Speed Calculations 4.     Hardware 5.     Drive Path 6.     Making Wheels 7.     What Next 1.     Overview I plan on using NEMA17 stepper motors ...
1.     Background 2.     The Provided Kit 3.     My Software Development Choices 4.     Sensor Tile Software 5.     Combining the Nucleo and SensorTile Cradle - What Did I Get ? 6.     Additional Hardware/Software Required 7.     Next Steps 1.     Background This blog post follows on from R2B4 - #1 An Introduc ...
Two of the PCBs I designed for the GraffitiBot came in but I won't have enough components to assemble them until at least next week. Here is what they look like: One interfaces to the load cell and one interfaces to the magnetic angle sensor.   While waiting for parts I have started looking at the software. ST Microelectronics has written a lot of software for this sensor tile and I am including some of the links in this blog. There are multiple links on each of the pages I have linked. ...
Greetings from the UAV R&D group. We hope all our fellow competitors are having a good time with the designing. Last month has been quite fulfilling for us as a research group. We were able to overcome some hurdles and complete the assembly of the drone. Also, there has been some progress in the sensor department. This post is all about it and also as you read through it, if some suggestion or doubt pops up in your head, feel free to comment.   The team has been working on identifying n ...
Hi Everyone this is udhay ,I am in my B.Tech Final Semester.I am sorry that i started late , but hope that i would be finishing my Task on time . I am very Happy to see my peers already Started working to great extent and their blogs are kind of guidance or templates about how i post my work . So What my Project is all About: It all Started with Problem: In our area i have seen empty fields turning into dump yards filled predominantly with plastic wastes and is getting difficult for the muni ...
This blog gives the unboxing and review of the Sixth Sense Design Challenge Kit     Blog Series Project ARORA #1: Introduction Project ARORA #2: Sixth Sense Design Challenge Kit Unboxing   About the challenge Sixth Sense Design Challenge ...
A recent incident that occurred in Thailand caused 13 people getting trapped in a cave. Earlier, natural disasters have caused a lot of devastation resulting in tremendous damage to person and property. Due to the accumulated heap of landmass spread over a large area after the flood, it was difficult to carry out the search and rescue operations or navigate manually. This led to numerous loss of lives because of the unavailability of emergency support. The ever-increasing number of fateful incid ...
I need to get the detailed mechanical design properly underway to ensure I haven't forgotten to order some critical parts. This blog covers design of the wheels and motor mounts. This video animates some of the CAD models to show their detail: The steering and drive mechanism is pretty complex as the steering wheel is also the drive wheel. The drive motor mount has a steering post on it to allow the steering motor to control direction of the drive motor. This motor housing has a very compl ...
I finally have all four custom PCBs designed and on order so I can spend some time describing the system a bit better. The diagram below shows how all the electrical subsystems are connected in the GraffitiBot. Although this is a busy diagram with lots of subsystems, there are just as many sensors on the Sensor Tile itself which are not broken out on the diagram. There are 2 batteries - one will power the pumps and drive motors, the other one will power the rest of the electronics. The key ...
Reality struck. despite its 'formidable' looking track, my chasis cannot move properly on the grass. The video shows that it struggle to move on my garden grass. The motor driver is a ST L298 based motor driver. It is dual channel but limited to 2A per channel. As one can see on the video, my power supply is also running into the >2A range and sometimes overload.   One way to solve this is to make use of current capable motor driver. I am right now evaluating the option. i do want to ...
    Some component testing.....   Electronic Interfaces This blog describes the interface for all of the GraffitiBot sensors and actuators. The GraffitiBot beast includes 18 sensors, 10 motors, a mSD card, an LCD, a Bluetooth radio, a capacitive keypad, and 2 Cortex M4 MCUs. The capacitive keypad actually boosts the number of sensors to 30. Sensors: The STMicroelectronics Sensor Tile has a whole suite of 14 sensors plus an MCU and radio all on a tiny card 13.6 x 13.7 mm: It has ...
I use a tracked chassis platform, which i ordered from Shenzen and it has arrived yesterday. Getting this shipped has gone through some drama. At first, the shipment is rejected by by forwarder, as it contains LiPo battery. I got to cancel the shipment, communicate with the seller to buy another set without the battery. In total, it take less than 2 weeks to ship, which is a very decent speed. As the chassis is not the main "sixth sense" design in this work, i have decided to use an off the shel ...