maxim DS2433 soic8 Arduino Uno read and write over 1 wire bus

First round of reading data from a DS2433 eeprom. The IC is a DS2433 soic8 from maxim.

Detail Photos Raspberry Pi Touchscreen Wire

Here are some detail photos from the rasberry pi wires to the usb touch controller and the 5V power from the usb wire. I have cut a normal USB wire and melted it to the power connector.

https://plus.google.com/photos/103195993650715866488/albums/5873445677799026241?authkey=COq6wce5hrep8AE

raspberry pi with usb powerbank accu

Next step for my raspberry pi project was to become mobile :-)

So i bought a USB Powerbank with 2 USB Poweroutputs to deliver enough power for the raspberry pi and my touchscreen. Both work on 5V.
I bought following powerbank from ebay for 15 EUR :

http://www.ebay.de/itm/110989165547

Some technical data:

• Output Capacity : 18.5Wh ( 5000mAh ).
• USB Port 1 : 5V, 1A.
• USB Port 2 : 5V, 500mA .
• charging time ca. 8,5 hours
• Input: DC5V 500mA
• max Output : 1.5A .
• 110 * 70 * 16mm
• 145g

And here is a short video on youtube:

Raspberry Pi - Howto recompile raspbian kernel

At first, i use Fedora. You can download Fedora here and start the .iso in a vmware or virtualbox. In fedora you need following packages

yum install gcc.x86_64 gcc-arm-linux-gnu.x86_64 git.x86_64 ncurses-devel.x86_64 

Then you have to download the raspberry pi 3.2.27 sources vom github:

 https://github.com/raspberrypi/linux/archive/rpi-3.2.27.zip 

 extract the zip file and go into the linux archive.

1. cp arch/arm/configs/bcmrpi_cutdown_defconfig .config 

2. make ARCH=arm CROSS_COMPILE=/usr/bin/arm-linux-gnu- menuconfig

Then the menuconfig will pop up and you have to select the device drivers under:

[Device Drivers] / [Input device support] / [Event interface] 

[Device Drivers] / [Input device support] / [Miscellaneous devices]/ [User level driver support] 

[Device Drivers] / [HID Devices] / [/dev/hidraw raw HID device support]

Next steps: compiling the kernel and copy it to the sdcard:

1. make ARCH=arm CROSS_COMPILE=/usr/bin/arm-linux-gnu- -k

2. mkdir ~/linux/modules

3. make ARCH=arm modules_install INSTALL_MOD_PATH=~/linux/modules

4. cp ~/linux/modules /[here comes the path to the sdcard]/lib/modules

5. cp ~/linux/arch/arm/boot/Image /[here comes the path to the sdcard]/boot/kernel.img

Reboot the rasberry pi and have fun. I will upload my .iso in the next few days. (this howto is based on the howto by Thomas Grziwa. Thanks a lot!

Issue: Calibration of Touchscreen under Raspbian

A great Link collection for touch calibration tools: http://tias.ulyssis.org/calibration/ and a great overview of the whole USB-HID and USB-non-hid touch issue: http://tias.ulyssis.org/calibration/device_support.html

Raspberry Pi Touchscreen

All informations about my raspberry pi touchscreen.

This is my 7" touchscreen, which i bought from an ebay seller called chinatobby2011 . It was an auction and i won it with a 45 EUR bid (free shipping).

An overview of the whole stuff linked together you can find in this video:

Its a 7" resistive touchscreen and called AT070TN92 V.5. This Touchpanel is linked to a controller board called VS-TY2662-V1 or PCB800099. I have made a screenshot from the ebay auction: goo.gl/hd9Nt  The auction title is: "HDMI+VGA+2AV Driver board+7inch 800*480 AT070TN92 V.5 Lcd with touch panel".
The direct link to the auction is: www.ebay.com/itm/170937641798

There are several issues:

The drivers, which are shipped with the board do not support ARM chipsets. (And the raspberry pi is based onARM architecture).
But i have found out, that rasbian delivers a driver:

egalax driver for raspberry pi

You just have to recompile the kernel.
(Howto will be created soon)
 

New Blog!

After my old blog crashed with a not known database issue, i will start over here on googles blogspot. So no database problems and hosting issues. Just naked hardware & software hacking stuff in your face ! ;-)
In the last few weeks the raspberry pi catched my attention and i am going to post several videos and howto stuff here. Furthermore, i have a lot of other hardware stuff to publish and archive here for interested geeks.

You can find my older videos on youtube:

http://www.youtube.com/user/renrulztk