Between the devil and the deep blue sea

-

When my son asked for a new MP3 with video player to replace his ancient Creative Zen micro I thought a new 8GB Creative ZEN will be a nice replacement. However the Zen micro units and the Zen V Plus have not been very reliable (at least not mine). It seems the obvious choice would be to go iPod nano. An option I would agree with but because my iPod decided not to allow writing new songs anymore a few weeks ago.

Several things seemed to favor the 8GB Creative ZEN: screen size almost double that of Ipod, a built-in radio and a built-in microphone enabling the use of the unit as a voice recorder. On the cons it was the size and thickness factors that played against Creative's.

Unfortunately, the 8GB unit was not easy to find, but somehow Santa managed to get one just in time. It was a disappointment to discover the unit display did not to work just after opening the box. However, just to follow the instructions we fully charged the unit and transfered a whole bunch of songs (data transfer worked ok) just to realize the initial assessment was just right. The display did not work.

Tomorrow I am going to return the unit to the shop but I am not sure whether they will have more units or not. On the other hand, I am not sure I am going to stick with Creative anymore. I do not like brands that do this to me.

Update: It took them almost half an hour to figure out the unit was not working (PC CITY). I was offered the unit on display or a refund. I took the latter. I tried to buy an iPod but they were locked inside a transparent container. I tried to get a shop attendant but none were available. I walk away after cashing my refund to go to the next shop (MediaMarkt) where I bought an iPod nano (there you could just pick up the unit).

BTW, no software comes with iPod nano. They seem to assume you'll have Internet access at home and you'll figure out how to download and install iTunes. For the moment the iPod nano works fine and transferring 7GB of MP3 music was ok. The only problem is that many of the CD covers were not automatically downloaded, just some of them were figured out ok.

Comments

Post a Comment

Popular posts from this blog

VFD control with Arduino using RS485 link

-
Image
Variable Frequency Drives ( VFD ) allow the control of spindles so speed can accurately be controlled and a detailed acceleration profile for the spindle and reverse rotation can all be handled. In essence a VFD is an three phase inverter for three-phase AC motor. I am using a popular (I mean cheap) Chinese VFD and though the reference manual is not great, I could see there is a built-in RS-485 port. I usually control the start, stop and speed selection using the keyboard on the unit but I thought it will be more useful if I could control everything from the same Arduino is doing our CNC table control. Some cheap RS-485 off eBay and some lines of code later, I can start, stop and change the speed from an Arduino. What a cool thing to have! Some configuration of your VFD are needed before you can use it like that.  You need to set PD163=1 (I am using address 1 in the code). PD=164=1 (for setting serial to 9600bps) and PD165=0 (for using ASCII and 8N1 character format)
Read more

How to get sinusoidal s-curve for a stepper motor

-
Image
After some experimentation, and delving a bit into the math of motion, I realized there can be a significant difference on the motion of a machine by just making small changes. A common and popular approach to smooth one axis of motion is to use a trapezoidal speed pattern, where acceleration and deceleration are uniformly accelerated movements (aka constant acceleration motion) separated by a portion happening at cruising speed. The problem comes with the fact that, while that approach is simple to understand and to code, it does contain sudden changes in the acceleration, that show as spikes on the acceleration derivative, called jerk. These sudden changes in the acceleration translate into undesired vibration in our machines. Most of that can be eliminated by selecting a motion pattern that does not contain sudden changes of acceleration. If we chose a mathematical function for our speed whose second derivative is continuous, then we reduce system vibration quite a lot. One ma
Read more

Importing OpenSCAD designs into Onshape

-
Image
After using Onshape CAD software for a while I am really fond of it. So one natural thing to do, specially once they have released the Instructor's kit is to start using it in the classroom too. But one thing I was not so sure how to do was to use old designs I made using OpenSCAD. It does not mean I am completely quitting using OpenSCAD but suddenly I can see I can do assemblies in Onshape that will look quite nice for showing and documentation purposes if only I could easily import from OpenSCAD. I am glad to report that the route OpenSCAD --> FreeCAD --> Onshape worked brilliantly. Even more when a few tricks were applied. While some people suggest to import CSG files from OpenSCAD to FreeCAD, I have had more success by directly importing SCAD files into FreeCAD. One trick that worked well for me was to get rid of $fn references, so now circles become real circles (or cylinders) in FreeCAD. If a part keeps some $fn references then your cylinders or circles wi
Read more