NEC iSM Client error on Windows 7

When using iSM software from NEC, if you succeed to install it, a strange bug appears.
When you press the "Configuration" button, then "Setting..." button, the following message appears:

[25222] The client under composition setup already exists.

This problem, however, does not occur on Windows XP.


Set windows compatibility mode of the shortcut/iSMCL.exe to Windows XP, like this:


USB devices on Google Nexus 7, cable

Well !

I am a proud owner of Google Nexus 7 3G with 32GB.
You all know that it doesn't have a SD slot or normal USB slot. I watched a few youtube videos, showing that you just need an OTG cable, and you can connect any USB flash drive.

1. First - FORGET ABOUT USB FEMALE-FEMALE scenario like this:

It does not work, I still don't know why and I search for reasons. But many people confirm this.

2. Second - NOT all cables work. I went to some shops with the tablet, and the cables seemed good, but they did not work. Finally I bought this one:

There isn't "OTG" word anywhere on the case, but it works. And I think it is too expensive - 5.5€

3. You have to be very careful, because the original cable miniUSB jack is slightly longer:

It clicks firmly to the tablet, BUT the OTG Hama cable does NOT click. May be there are better cables. I will try to remove 1mm of the plastic and maybe post pictures later. As you can see the tablet mini USB plug is somehow under the cover.

4. Software - if you don't root your device like me, you need Nexus Media Importer software.
I was unable to do anything without it, even with ES File Explorer.
The Nexus Media Importer can stream files from your flash memory - movies, music.
It can also copy files USB->tablet.
Vice versa tablet->USB is also possible, but only if the USB is FAT16 or FAT32 format.

5. Other devices
I tried to plug a mouse - it is really funny!
I tried an old GamePad, but it does not work so well. The games don't detect it at all, or misplace the keys!



Infinite garden solar lamp

Hello folks,

We all have seen many solar lamps. They can be really cheap, lets say down to 1$. For this money you cannot buy even a solar panel, NiMH battery or electronics from a hobby shop.
They have also the disadvantage that the battery is not feeling very happy with all this charge and discharge, not full cycles. And it quickly dies.
Most lamps don't give light all the night, because of many reasons - bad/old battery, small solar panel, awful electronics.
In the light of my prevoius article about supercapacitors, I thought - isn't it possible to use supercap instead of a battery, because it will last longer. Only the electronics should be slightly changed.

I searched the net, and it appears that a wise guy already did that. You can follow the process of developing the schematic of the lamp step by step with the videos below. He put a lot of efforts to make this product, practicaly it should last forever. It has better LED, very huge supercap - 350F, which can illuminate the LED more than the whole night, and a very very decent solar panel.
The electronics itself is a state of art, it is so small, that it is soldered to the supercapacitor.
Actualy it can charge even in cloudy weather. You can put it in any casing you like :)

Follow the development process:








You can support this project here:

The guy wants to make more decent price, by reaching 100 orders, and buying all the stuff with a discount. I wish him good luck, and I hope we will see lamps like this in the shops soon :)

I also found a company that produces supercapacitor garden lights. They look AMAZING!


Supercapacitors info (incomplete)

There are tons of information about supercaps on the internet.
That is why I decided to put everything, that I find practical and interesting here!

The Wikipedia link: http://en.wikipedia.org/wiki/Supercapacitor

The supercapacitors are capacitors that can hold nearly 1000 times more energy than a normal capacitor. In many cases they can replace rechargeable batteries, or lead-acid batteries.
However there are a lot of differences, that are important to know.

I will make a table of comparisson and descriptions. Please leave a comment to correct my data.
Red color means worse, Green means - better.

Supercaps NiMH batteries
1 Energy density 5-10 Wh/kg 60-120 Wh/kg
2 Charge time seconds few hours
3 Discharge voltage drop down to 0V, constant Almost stable 1.2-0.9V
4 Charging cycles ~infinite 500-1000
5 Price expensive cheap
6 Element voltage 2.7V 1.2V
7 Self discharge fast slow
* Working Temperature
* Charging circuit
* Shelf life


  1. Even 1000 times more than biggest capacitors is not enough to hold the energy of a normal 1.2V NiMH battery. A 3000Farad 2.7V supercapacitor has almost the same energy of a single AA 2500mAh 1.2V NiMH battery.

    The calculations are very simple:
    AA Battery = Ah*V*3600 = 2.5*1.2*3600 = 10800 Joules
    Supercap = 0.5*F*V*V = 0.5*3000*2.7*2.7 = 10935 Joules

    Lets compare also the size and weght:
    AA Battery = length - 50.5mm,   diameter - 14mm
    Maxwell 3000F/2.7V supercap = length 138mm,    diameter - 60mm (~12x bigger)

    AA Battery = 31g (NiMH)
    Maxwell 3000F/2.7V supercap = 510g (~17x heavier)

    Some more calculations:
    AA Battery = 15.28 Joules/mm2 ,   348.39 Joules/g
    Maxwell 3000F/2.7V supercap = 1.32 Joules/mm2 ,   21.44 Joules/g

  2. Everybody knows you have to leave NiMH to charge overnight. Supercaps charge in seconds, if you can supply enough current for them. Like every capacitor, they charge on a curve. At first maximum current flows, and after that it lowers, as the supercap charges. In the end no current flows any more.
  3. While discharging the supercap linearly drops to 0 Volts. This means that you can use all the stored energy. However most devices are not happy if the supply voltage changes in so big range 2.7V-0V. On the other hand NiMH batteries keep almost stable around 1.2V while discharging. When they drop under certain voltage, they can die and become useless. To solve this problem a DC-DC converter can be used for the supercap.
  4. The supercaps have the advantage that they can be recharged many many times, and their capacity does not change much in time. NiMH batteries have a limited number of charging cycles, and their capacity deplete in time. Specialist also reccomend that you fully charge and discharge them (discharge to ~0.9V) to keep them in good health. No such problem with supercaps
  5. Yes, the supercaps are expensive, but it seems the technology is not so complex, and they will get cheaper in time. These days (July.2013) one of the best offers I found is - Maxwell 350F 2.7V for 11$.
  6.  You know one NiMH battery can be charged to 1.2V or even slighly higher. The supercaps are not like ordinary capacitors, where you can buy 500V capacitor. It does not matter if the capacitor is big or small - it is limited to 2.7V (some supercaps like LiOn supercaps can reach 4V). If you need higher voltage you can stack several supercapacitors, like batteries.
  7. Both NiMHs and supercaps discharge while they stay idle. However modern NiMH can keep up to 80% of their charge after 1 year of staying on the shelf. The supercaps can discharge completeley for a few weeks. However LiOn supercaps voltage drops about 5% for 3 months, which is quite good.

* not finished, updated almost every day, little by little :)