Friday, March 29, 2013

Meeting Notes 3.29.13


Old Todo


  • Idea Wrap drink lines around co2 container for cooling
  • Will the CO2 tank use up all the drink?
  • Do we have enough pressure to move the solenoid
    • Note: This is not a gravity-feed solenoid. This means that you will need enough water pressure to fully open the valve. Check the datasheet below for exact details. It operates at a minimum of around 3 PSI, allowing around 3 L/min of flow. Although the datasheet shows the valve working at 220 VAC, it's actually 12 VDC. Our 350 GPH pump does not have enough pressure for this valve. A garden hose or other pressurized system should work just fine.
  • Upcoming DeadLines
    • We are behind schedule but will make it up
    • Still Behind due to slow part orders
  • Part Ordering
    • McMaster Parts (Jordan)
      • done
    • Robot Market Place (David)
      • Battery Done
    • Northern Tool (Jordan)
      • Wheels Shipped
    • Amazon (Jordan)
      • HP Touch pad (Done)
  • RCOS Presentation
    • intro slide (Jordan)
    • Chassis (Kyle)
    • H-Bridge (David)
    • UI (Bhrath)
    • Future(Jordan)
    • Questions(all)
      • Presentation went great Not to follow through with work

New Todo

  • Update GIT Hub (Software Team)
  • Orders
    • Orders
      • Other Wheel (Jordan)
        • Shipping
      • Tube (Jordan)
        • Shipping
      • Solenoid Adaptors (Jordan)
        • Order
      • Keystock (David)
        • PO turned in
      • I/O I/O (David)
        • PO turned in
      • Battery (David)
        • PO turned in
      • More Metal (David)
        • Home Depot Run (on Monday)
        • Will happen on Friday
  • Finish Chassis
    • Add Wheels and Motors (Kyle)
    • Add Electronic Board (Andre + David)
    • Water Jet Order (Jordan)
      • Waiting to see how to cut it down to fit on water jet
    • Add Tablet (Kyle or Jordan)
  • Continue Wiring (David + Andre)
  • Sensor Array (TBD)


Saturday, March 23, 2013

Meeting Notes 3.23.13


Old Todo

  • Update Budget (Dan)
    • Done
  • Look For Wheels (Kyle)
    • Done
  • Search for Android Tablet (Bhrath)
  • Finished Soldering H-bridge circuit (David)
  • Make Chassis (Kyle+Jordan)
    • Working on it tonight
  • Get specifics on new UI Design

New Todo


  • Idea Wrap drink lines around co2 container for cooling
  • Will the CO2 tank use up all the drink?
  • Do we have enough pressure to move the solenoid
    • Note: This is not a gravity-feed solenoid. This means that you will need enough water pressure to fully open the valve. Check the datasheet below for exact details. It operates at a minimum of around 3 PSI, allowing around 3 L/min of flow. Although the datasheet shows the valve working at 220 VAC, it's actually 12 VDC. Our 350 GPH pump does not have enough pressure for this valve. A garden hose or other pressurized system should work just fine.
  • Upcoming DeadLines
    • We are behind schedule but will make it up
  • Part Ordering
    • McMaster Parts
    • Robot Market Place
      • Battery
    • Northern Tool
      • Wheels
    • Amazon
      • HP Touch pad
  • RCOS Presentation
    • intro slide (Jordan)
    • Chassis (Kyle)
    • H-Bridge (David)
    • UI (Bhrath)
    • Future(Jordan)
    • Questions(all)

Sunday, March 10, 2013

Prep for Chassis Welding

Hello, over the break our goal is to get the chassis more or less up and put together based off Kyle's awesome CAD of the design. To get the chassis together we have to weld it but unfortunately most metal from home depot, although cheap comes with a coat of zinc, or galvanization on it. To keep with the kind of do-it-yourself mantra of open source I tried to find the easiest and cheapest way to get that coating off. On the internet various sources have suggested "muriatic acid" which is used in cleaning pool. This maybe okay for some people and it definitely gets the job done, but it's a bit pricy and you have to be a lot of it. Also pool supply stores and few and far between especially for someone like me who has to get to places by bus. What i did was get some good old toilet bowl cleaner. Like this one I found for 4$ at my nearest walmart.
















This stuff is amazing for it's price and I would highly suggest it. I also bought some baking pans to soak the metal int seeing as I would want to throw these away after, or at least not use something more expensive. the next thing I did was get 2 large containers, one filled with water to quickly remove any that got on my hands and dilute the acid too (I know baking soda would also work, but a whole thing of it was unnecessary for small stuff), and the other to pour the used acid into (you can't just put it down the drain). Then I got a box to put it in if it spilled and filled it with lint to absorb if anything went wrong. I soaked the area for about 2-2.5 hours and got this result...

This is more than ample space for welding. Just a bit of things i ran into, make sure you take off the price sticker on the metal because the acid will not go though it. Also do it in an open area, and wear safety glasses. I also would suggest to make a cheap funnel by cutting the top of a water bottle, because it comes in handing getting it from the pans to back into a container. If things all go as planned we could have a chassis in no time!




Friday, March 8, 2013

Update On Material

I have just placed the first order for all the plastic that will be used on the robot. It should come in next week.  I am so excited. It looks like the robot is really coming together. I am also going to clean and prep the steel for welding which may take place too. Have a great spring break!

Wednesday, March 6, 2013

Chassis update #2


The chassis has made some big design leaps since the last update. First, we began to get into the details of the internal structure. This process began as something of an organization game, with the goal to make each sub-system fit neatly with the others. Even weight distribution and ease of maintenance access were some of the top priorities, while also keeping some wire routing paths in mind. With 2-liter plastic bottles seeming like a likely choice for our beverage containment vessels, we had enough to begin adding to our CAD model.


Shown above is our "bottle rack". The shelf below the bottles has holes cut to allow the outflow tubing to connect. After the bottles were in, I began adding in more frame members to support the anticipated components we would need.


You can now see our placeholder CO2 tank in the frame, as well as a funnel support (for the drink dispensing), and a mysterious pole at the top. The placement of the CO2 tank was intended to help offset the  weight of the filled bottles. Metal members going horizontally around the frame are primarily supports for different components. They are not yet vertically constrained, which allows us to slide them up and down until we find a good position in the model. With the addition of the shell and final internal pieces, I played around a little with the render feature for the following image.


The bent plastic piece mounted to the front shell represents the backing to the dispensing area. The box on the left side of the frame is a placeholder for the solenoid valves. I also experimented with changing the position of the electronics board from the top to the right side for easier access from the removable back panel. Finally, the pole on top is now supporting a generic Android tablet, which will serve as the interface screen.


A view from the front shows some new cuts in the front shell to accommodate the dispensing space and give Alfred a name. 


Saturday, March 2, 2013

Motor Control Circuit Testing

For the past two meetings, I have been focusing on getting the motor driver part of Alfred working. The video above was taken from Alfred's meeting on 2-22-2013, I built my test H-Bridge circuit on the breadboard provided by the Mercer Lab. At first, we thought it was not working, but I realized that I did not connect the top two transistors of the H-Bridge properly.

On 3-1-2013, I started to solder the H-Bridge circuits to the perfboard provided by the Mercer Lab. I could only solder the first H-bridge circuit to the perfboard since everyone also in the meeting were thinking of a way to implement Alfred's UI. Today, I finally finished soldering the last part of the circuits. I will test the circuits this coming Friday.