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Finite Element Analysis

Web application for analysis with jfmatrix. For the engineering purpose, you may required to model the structure such as truss or any 3d printed parts which will be subjected to load. Therefore, you may want to watch this example in youtube. It is very useful indeed.

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MPD in RPi Zero

The wireless device (i.e. Realtik 802.11n Wifi Dougle) of Pi Zero goes to sleep after a period of no activity. It’s a power saving and power management scheme.

  1. You are recommended to edit /etc/rc.local and a line “iwconfig wlan0 power off” before a line with “fi”. To verify the power management function, use “iwconfig” command. You should see ” Power management: off” in the screen.
  2. Turn off the power save feature of wlan0 by using a 8192cu module in the kernel.

To turn off powersave, add the following to /etc/modules, or create a file (8192cu.conf) in /etc/modprobe.d/ with the line(s):

# prevent power down of wireless when idle
options 8192cu rtw_power_mgnt=0 rtw_enusbss=0

Next reboot (sudo reboot) it should disable the sleepy mode and your pi will be accessible all the time. You only need rtw_power_mgnt=0. You can verify it’s taken effect with cat /sys/module/8192cu/parameters/rtw_power_mgnt, which should return 0

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Tour – Japan

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Canon 600D + Rpi

Remote shooting with Raspberry Pi is possible in Windows with the installation of Canon Utilities. In fact, it can be done with this. On the other hand, if you are using linux. “gPhoto– libgphoto” will be used intead.

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Watch Winder

If you have automatic watch (i.e. mechanical), it is necessary to wind it to prolong the accuracy and life of watch. Therefore, I made this winder for my seldom used watches. It was driven by geared motor and use gears to slow down the revolution and to wind two watches together. Programmable timer or a custom made raspberry pi power controller was used to switch on the winder at regular intervals.

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LIRC – Pi Zero W

This is the project to use Pi Zero W which installed with LIRC for the control of house devices.

In order to send commands via raspberry pi, it is possible to alternative method as in here.

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Diy-valve amplifier

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