Comments for PocketMagic

Comment on High Frequency Solid State Tesla Coil (HF SSTC) by James

James — Wed, 22 May 2013 02:06:11 +0000

Can you explain the MOSFET can survive from 100V?

Comment on How to make metallic sodium by Radu

Radu — Tue, 21 May 2013 15:59:56 +0000

@Ryan your assumptions are correct.

Comment on Android Native Screen capture application using the Framebuffer by Vish

Vish — Mon, 20 May 2013 05:57:21 +0000

Hello Radu – I am able to use this code and capture screenshots from Samsung phones. But it captures a black screen shot for Nexus 4. Do you know how to correct it?

Comment on Developing for Blackberry -part 2- by Developing for Blackberry 10 « PocketMagic

Developing for Blackberry 10 « PocketMagic — Sun, 19 May 2013 10:10:38 +0000

[...] to make even more apps for the platform. Here I was surprised to find new changes, as compared to my previous experience with these devices. Installing the new development tools is easy, it is a customized IDE based on [...]

Comment on Developing for BlackBerry – introduction by Developing for Blackberry 10 « PocketMagic

Developing for Blackberry 10 « PocketMagic — Sun, 19 May 2013 10:10:05 +0000

[...] In a world dominated by Android and iOS, how hard is it for another mobile platform, be it one bearing the glory of the past, to reconquer the market shares it once had? It's all about marketing, a bit of luck, but from my point of view (not generally applicable, see how iOS started), the technology involved – the actual value resulting from the time and effort invested in making something better. Blackberry has reinvented itself in a new, fierce competitor with its latest release, the Blackberry 10. The handsets running the new OS are impressive: huge 768 x 1280 pixel screens, 8Mega pixel camera (with geotagging and face detection), 2GB of Ram memory and a Dual-core 1.5 GHz Krait processor. A beast in terms of hardware capabilities but also a huge step forward. [...]

Comment on Atmega8 and enc28J60 for ethernet support by reza

reza — Sun, 19 May 2013 08:10:57 +0000

hi
this is so good program
i test it and worked fine

i need display computer ip in lcd on miciro

how can i get computer ip in avr ????

i’m waiting for your reply
please help me
tank you

Comment on Atmega8 and enc28J60 for ethernet support by Ayaz

Ayaz — Thu, 16 May 2013 16:51:36 +0000

Hi Radu
i have same problem as pavel. please help us
i am using atmega32a also i tried PB2 but not worked.

Comment on Victoreen CDV-700 6B Dosimeter Mod (Audio/BNC Connector) by Victoreen CDV-717 Remote Gamma Survey dosimeter « PocketMagic

Victoreen CDV-717 Remote Gamma Survey dosimeter « PocketMagic — Thu, 16 May 2013 11:15:50 +0000

[...] cable. Because of the extension cable container, the unit is considerable bigger in size than the CDV-700. The CD V-717 is a very high-range gamma radiation detecting instrument, that uses a ion [...]

Comment on Victoreen CDV-700 6B Dosimeter Mod (Audio/BNC Connector) by Repairing a Victoreen CDV700 6B Dosimeter « PocketMagic

Repairing a Victoreen CDV700 6B Dosimeter « PocketMagic — Thu, 16 May 2013 09:12:10 +0000

[...] own a functional vintage CDV700 unit, that I've presented here. Functional, at least until it decided to stop working for no apparent [...]

Comment on Simple DIY Induction heater by Cagdas

Cagdas — Thu, 16 May 2013 07:55:26 +0000

I have checked it many times but clearly i am missing something. I set my power supply to 12V @ 10 Amps as you said, first i saw 0.2A and mosfets were not even warm than i turned off and on again the power supply, and i saw the circuit takes 9 Amps and in the same second mosfets got burned. So i am obviously doing something wrong but to figure it about where is the problem, is there any tests that i can locate the problem?
Thanks for you quick replies.

Comment on Android controlled robot (via Bluetooth) – Part 1 by eclipse arduino code crashing for bluetooth control - How-To Video

eclipse arduino code crashing for bluetooth control - How-To Video — Wed, 15 May 2013 22:22:22 +0000

[...] am trying to implement the code : http://www.pocketmagic.net/wp-content…; as described here http://www.pocketmagic.net/2010/11/an…; but its crashing .I have changed the sdk to 2.3.3 as 1.5 still shows error in bluetoothadapter [...]

Comment on Simple DIY Induction heater by Radu Motisan

Radu Motisan — Wed, 15 May 2013 15:16:07 +0000

Thanks for the pictures. The components you’ve used seem ok, so I can only assume there’s a human error factor. Double check or triple check your circuit. Make sure your power supply is 12V @10Amps at least.

Comment on Simple DIY Induction heater by Cagdas

Cagdas — Wed, 15 May 2013 15:13:06 +0000

https://www.dropbox.com/s/g80sbe8b7shymks/Y%C3%BCksek%20Frekans%20001.JPG
https://www.dropbox.com/s/6uepu6g6uvn1xll/Y%C3%BCksek%20Frekans%20002.JPG
https://www.dropbox.com/s/16fb8x572rhrsb0/Y%C3%BCksek%20Frekans%20005.JPG

At the beginning i used one 0.47uF 65V Capacitor than i rewatched your video and i saw you have 2000V capacitor so i add more of them just to see if it will change something but it didn’t. I know the quality of my circuit is bad.

Comment on Simple DIY Induction heater by Radu Motisan

Radu Motisan — Tue, 14 May 2013 19:30:24 +0000

@Cagdas, send me a few pics so I can have a look over what you’ve done.

Comment on Simple DIY Induction heater by Cagdas

Cagdas — Tue, 14 May 2013 11:49:48 +0000

Radu,

I tried the circuit and i couldn’t make it work :/ Just Mosfets are getting heated. The aim is heating the metal workpiece not the mosfets right?
Do you have an idea what am i doing wrong?

Thanks
Cagdas

Comment on How to scale an Android UI on multiple screens by Alexandr Kuskov

Alexandr Kuskov — Mon, 13 May 2013 08:59:09 +0000

Thanks for your post. FYI the same post from my blog about image scaling

Comment on Atmega8 and enc28J60 for ethernet support by Radu Motisan

Radu Motisan — Sun, 12 May 2013 08:25:33 +0000

@pezhman: yes

Comment on Atmega8 and enc28J60 for ethernet support by Pezhman

Pezhman — Sat, 11 May 2013 20:17:14 +0000

Hello, great job pal.

I’d like to know if you could use LM35 or other analog sensors to the board.
Appretiated.

Comment on How to make metallic sodium by Ryan Graham

Ryan Graham — Sat, 11 May 2013 17:35:32 +0000

I’m curious if potassium chloride might be used in place of the sodium chloride in the video. Potassium metal, when it interacts with water, creates a much more violent chemical reaction than does sodium. I presume the cathode would be where the potassium would collect as well.

Comment on Simple DIY Induction heater by Radu Motisan

Radu Motisan — Sat, 11 May 2013 13:23:22 +0000

Salut Nelu. cu ce anume pot sa te ajut? Montajul de mai sus e un bun punct de pornire!

Comment on Android Overlay Mouse Cursor by Mouse control the mobile Cursor overlay - How-To Video

Mouse control the mobile Cursor overlay - How-To Video — Sat, 11 May 2013 12:54:59 +0000

[...] . but the author only make overlay on the mobile screen. the link is http://www.pocketmagic.net/2012/07/an…; . i want to know how to finished it,can you give some advice. if i need some c code of android [...]

Comment on Android Overlay Mouse Cursor by wangpeng1

wangpeng1 — Sat, 11 May 2013 12:45:50 +0000

can you share the mouse control the cursor overlay?

Comment on Simple DIY Induction heater by Nelu

Nelu — Sat, 11 May 2013 12:02:45 +0000

Scuze -am uitat sa mentionez materialul-plastic

Comment on Simple DIY Induction heater by Nelu

Nelu — Sat, 11 May 2013 12:01:48 +0000

Buna Radu,
Ma poti ajuta cu o schema similara cu cea postata de tine mai sus, pentru incalzirea unor bucati de max.1cm. in diametru.Din cele citite de mine ar trebui sa fie undeva la 27 mhz.
Cu respect, Nelu

Comment on Wireless Power Transmitter by Mark

Mark — Fri, 10 May 2013 11:19:59 +0000

Also what power rating resistors would you advise to use?

Comment on Wireless Power Transmitter by Mark

Mark — Fri, 10 May 2013 10:49:23 +0000

Just curious about how crucial the number of turns and the size of coil are to correct operation

Comment on Pulse generator (Variable duration, frequency and amplitude) by Thyratrons « PocketMagic

Thyratrons « PocketMagic — Thu, 09 May 2013 20:05:47 +0000

[...] as presented here. – a hydrogen thyratron, TGI2 400/16 – a 200V pulse generator, more details here. The oscillator itself is described [...]

Comment on Thyratrons by Tube: TGI2 400/16 (ТГИ2-400/16), Russian hydrogen thyratron « PocketMagic

Tube: TGI2 400/16 (ТГИ2-400/16), Russian hydrogen thyratron « PocketMagic — Thu, 09 May 2013 20:00:16 +0000

[...] already presented a few words on Thyratrons in one of my previous articles on this topic. Now I want to show you a new addition to my collection, a hydrogen thyratron [...]

Comment on Wireless Power Transmitter by Radu Motisan

Radu Motisan — Thu, 09 May 2013 12:19:44 +0000

A short answer would be: based on my previous experience, but why are you asking, Mark?

Comment on Wireless Power Transmitter by Mark

Mark — Thu, 09 May 2013 12:15:26 +0000

Hi Radu, could you tell me how you came up with the coil size/ number of turns required?

Comment on Programmatically Injecting Events on Android – Part 1 by Radu Motisan

Radu Motisan — Thu, 09 May 2013 08:28:10 +0000

see part 2 of this article

Comment on Programmatically Injecting Events on Android – Part 1 by Pete

Pete — Thu, 09 May 2013 05:45:59 +0000

Hello, great post. I have a similar question as tcboy. I am trying to simulate touch gestures over the software keyboard to swipe across several keys to make a word. I am trying to use your method 2 and the below code from Robotium to interact with my app. It works fine when the keyboard in not up but when the software keyboard is up it is executed but no MotionEvent.ACTION_DOWN is registered in the app of the keyboard.

I was able to get adb shell input tap x y to click on the key in the software keyboard but this will not work as I need more control of the specific motion actions.
Any suggestion on how I can get suggestion 2 working on the software keyboard to press keys? Do I need to set some flag in my app layout.xml file?

TEST CODE:

Instrumentation inst = getInstrumentation();
// sending event – finger touched the screen
MotionEvent event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_DOWN, xStart, yStart, 0);
inst.sendPointerSync(event);

Comment on Wireless Power Transmitter by Jean

Jean — Thu, 09 May 2013 00:57:43 +0000

I can only find X2 275 VAC MKP in my local stores, can those work? For example, if I fix 470 nF at the transmitter, I will need to change the value of cap at the receiver in order to have the same frequency with the transmitter part ( like your’s 440 nF)? Thanks.

Comment on Android Overlay Mouse Cursor by Shawn

Shawn — Wed, 08 May 2013 18:43:45 +0000

I am sorry….it’s my own mistake…..I forgot I have set the update border to avoid cursor update to outside screen and forgot verfiy the algorthm. looks this is the problem. I’m Sorry for disturb.

Comment on Android Overlay Mouse Cursor by Shawn

Shawn — Wed, 08 May 2013 18:37:52 +0000

And I try connected two devices with (480*800 and 480*840 resolutions) the cursor reachable area at 480*840′s device is 480*800 also

Comment on Android Overlay Mouse Cursor by Shawn

Shawn — Wed, 08 May 2013 18:32:47 +0000

Hey Mr.Radu. The sample codes you provided seems have some problem with resolution. I assume the overlay width and height is define with params but change it does not affect the cursor reachable area. What I am doing is connect two device (with different resolution) and one device send the co-ordinates to update the position of cursor. However I am not sure why the cursor area is automatically set as client and limit the cursor reachable area (480*800, use to send co-ordinate. and server is 720 * 1280). Do you know what cause this happen and know the possible solutions?
Sincerely,Shawn

Comment on Wireless Power Transmitter by Radu Motisan

Radu Motisan — Wed, 08 May 2013 15:00:39 +0000

@JP: other types yes, but not electrolytic.

@Jean: aprox. 1cm . the coils are not critical, but after you build them, you’ll probably need to adjust the values of the capacitors you use, to tweak the working frequency (given by LxC ).

Comment on Wireless Power Transmitter by Jean

Jean — Wed, 08 May 2013 14:41:14 +0000

Hi, may I know what is the diameter of the center of the coil? Does the number of turns affects the frequency or it will still be functioning if Im using the same number of turns and same value of cap for both side of the coils? Thank you.

Comment on Write on the Android Read-only file system by ludijor

ludijor — Wed, 08 May 2013 14:16:46 +0000

The second options works for me, thanks

Comment on Android Native Screen capture application using the Framebuffer by Radu Motisan

Radu Motisan — Wed, 08 May 2013 11:56:28 +0000

Yes, it is both possible and easy , using JNI. I might write an article on that later.

Comment on First steps with micro controllers (ATMega8) by vivek

vivek — Wed, 08 May 2013 09:22:17 +0000

very nice It works i have tried

Comment on Android Native Screen capture application using the Framebuffer by nll

nll — Tue, 07 May 2013 20:44:18 +0000

Anyway converting this native code to a function that can be called from within java code and return an image?

Comment on Programmatically Injecting Events on Android – Part 2 by szihs

szihs — Tue, 07 May 2013 18:48:04 +0000

#adb shell getevent -l /dev/input/event3
Do any event on touchscreen.
EV_ABS ABS_X 000007a8
EV_ABS ABS_Y 00001346
EV_ABS ABS_PRESSURE 00000057
EV_KEY BTN_TOUCH DOWN
==
The type-code-value will be output on terminal. I didn’t face screen freeze but i found #getevent extremely informative.

I found this more easy to read and understand the sequence.

2.
adb shell sendevent device type1 code1 value1
adb shell sendevent device type2 code2 value2
to see you sequence works

Replay it using code.
intSendEvent(m_nId, EV_ABS, ABS_X, x);
intSendEvent(m_nId, EV_ABS, ABS_Y, y);
intSendEvent(m_nId, EV_ABS, ABS_PRESSURE, p);
intSendEvent(m_nId, EV_KEY, BTN_TOUCH, 1);

Comment on Wireless Power Transmitter by JP

JP — Tue, 07 May 2013 09:00:45 +0000

Thanks. Can the MKP capacitors replaced with other types of capacitor, etc electrolytic? Thanks in advance. Nice day.

Comment on High Frequency Solid State Tesla Coil (HF SSTC) by Carlos

Carlos — Mon, 06 May 2013 22:04:22 +0000

ok, I’ll try.
had left with 24v the input because I was afraid of burning the IRFP460

Comment on Programmatically Injecting Events on Android – Part 2 by Radu Motisan

Radu Motisan — Mon, 06 May 2013 18:08:40 +0000

@szihs: sounds good! some of the users in the comments above, mentioned issues in using the code on android 4.2 . Can you help them with some hints?

Comment on Android Unique Device ID by Radu Motisan

Radu Motisan — Mon, 06 May 2013 18:06:06 +0000

@Martin, yes you can use the same approach for ios.

Comment on Programmatically Injecting Events on Android – Part 2 by szihs

szihs — Mon, 06 May 2013 16:37:40 +0000

Hi Radu,
Thanks to your sample i successfully adapted to implement drag/scroll.
Using Nexus One with Android 4.2.2

Comment on Android NDK for Windows setup guide by azizachom

azizachom — Mon, 06 May 2013 14:32:32 +0000

hi,

thanks for this tuto,

so i have to change the cygwin.bat forr every project?

Comment on Variable 0..30V 20A Regulated Power supply using LM317 by Abhishek Kumar

Abhishek Kumar — Mon, 06 May 2013 14:19:12 +0000

Heyy Radu,
Recently i got a 850VA inverter’s transformer.I want to know that will the same circuit work with this transformer as well?
P.S The transformer is 12V rated.