The previous blog decribed how to get access to RPi through an Ethernet cable. One shorcoming of this method is your RPi has no internet connetion. In this blog I will show you how to get access to RPi through Ethernet cable which connected to an Ethernet hub.
In last blog, I described how to access to RPi through WiFi. The advantage of this method is that your RPi can now access to internet. But, still you need a WiFi environment. What if I want to connect my RPi in field? Of course the simplest way if use an Enthernet cable, but maybe you want to access to RPi remotely, for example, I have created a RPi controled car, and I want to test it in field where there is no WiFi. We can access to RPi through a smart phone’s hotspot, and control RPi using a smart phone.
In previous blog, I described how to access to RPi through an Ethernet cable (RJ45). That’s a convenient way to connect your RPi when there is no internet connection. However, it’s almost useless of a computer without internet connection! In this blog, I will describe how to access to RPi through WiFi.
Raspberry Pi is a credit-card sized (not the thickness) Linux computer, besides its small size, it has pins (GPIO) which allow you to connect other devices, like motors, servo, sensors, LED, etc. I felt in love with Raspberry Pi (RPi) this summer: as an IT advisor, the dream of making robot could come to true!
It’s a common requirement that your Shiny application should be bilingual. I have tried several methods and finally I got one which is not so difficult to maintain.
When plot with R (or some other software), it doesn’t bother you a lot for choosing colors if you have only several data series. For example, if I want to create a figure for 5 data series, I can easily choose red, green, dark green, blue and black. But what if I need to create a figure having 100 data series? Of course, we can choose different shape or pattern, like dash line, circle, triage, etc. However, to me, I feel that make the figure messy, I prefer all series in same style, except their colors. I created a Shiny-app which can generate random distinct colors in a certain color plate, would like to share it with public.
The Shiny-app on open-source edition Shiny-server has only one concurrent, which means it can run only for one user at a time point. But it can host multiple Shiny-apps, which can run synchronously. So, if we create severl Shiny-apps with different names but same function, then we can let more users use our service at same time. But users don’t how to choose the Shiny-app with small user number. This post will show you how to create a Shiny-app to redirect user to the Shiny-app with lower load.
RStudio supplies several servers for hosting user’s apps, e.g. http://www.shinyapps.io/, http://spark.rstudio.com, http://glimmer.rstudio.com. Thanks a lot to RStudio who has contributed many excellent R libraries! I want to set my shiny-server on a virtual private server (VPS), because I have some other tasks and I feel a VPS is more stable than the PC under my desk.