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1  Using Arduino / Motors, Mechanics, and Power / L9958 & SX8847 SPI register access problem on: June 08, 2013, 03:48:19 pm
Have anybody managed to access the registers in L9958 (from ST) or the SX8847 H-bridge board.
I have this H bridge,  http://www.ebay.com/itm/New-240W-H-bridge-Motor-Driver-Board-Motor-Controller-SPI-for-Arduino-Smart-Car-/251264551913?pt=LH_DefaultDomain_0&hash=item3a8088cbe9
I have the manual, http://www.st.com/web/catalog/sense_power/FM1965/SC1039/PF246497  , but there is information how to write and read the registers.
I want to use Arduino and its SPI library for this purpose.

2  Using Arduino / Storage / Re: TFT and LCD SD CARD SHIELD PROBLEM SOLVED on: April 09, 2013, 01:18:06 pm
I could not determine where the resistors were connected. Due to lack of time and interest I decided to remove everything. The resistors are protecting the SD card from over-voltage but usually they are 5V resistant.
If you are sure you wire to the correct pin on the SD connector, just leave the resistors mounted. However, I believe it is easier and more reliable to solder directly to a pin rather to a SMD surface.
Conclusion: either way is good.

3  Using Arduino / Storage / Re: TFT and LCD SD CARD SHIELD PROBLEM SOLVED on: January 03, 2013, 01:32:49 am
The touch screen works with this setup. I have tested it. The only problem was the SD card interface.
4  Using Arduino / Storage / Ethernet Shield for arduino MEGA 1280 on: December 11, 2012, 05:26:29 am
This is a hack for using the Ethernet Shield from DFRobot with MEGA.
You can NOT use pin 10 for the SD card as it is already used for the W5100 chip (eth).

1. Bend the following pins on the Ethernet Shield:: 3, 6, 8, 9.
2. Use wires to connect to the MEGA pins as follows::
ETH pin      MEGA pin
3(DO)         50
6(CS,SS)     53
8(DI)          51
9(CLK)        52
 (see picture)
Now you can use the SD and UTFTtf Libraries as is.
The SD Library works with both FAT16 & FAT32.
The UTFTtf Library works only with FAT16.
5  Using Arduino / Storage / TFT and LCD SD CARD SHIELD PROBLEM SOLVED on: December 11, 2012, 05:06:42 am
There are several different shields that can be bought on the net. The shields that I bought from China had some errors.
I could not get the SD card to work. On the LCD module the connector was not working and the Touch Screen + TFT LCD + SD  (billgps2010@163.com, design by JQT, 5/6/2012) had the SCK and SI switched.

TFT LCD Mega Shield V1.2 with SD card connector is not working for SD card.
NOTE: The wiring or routing is wrong SCK and MOSI is switched on the Shield (red PCB).
The best approach is to solder and remove the resistors and the connector.

The setup is MEGA 1280 + TFT LCD Shield + 2.4" TFT Display with SD card slot.
NOTE: Remove the SD card connector & resistors on the display module (blue PCB).

SOLUTION:
Solder a new SD card connector to the SHIELD.

SD card pin     SHIELD (pin)
1 (CS, SS)        53
2 (DI)              51
5(SCK)            52
7(DO)             50

3,6 GND
4 3.3V

The SD Library works with both FAT16 & FAT32.
The UTFTtf Library works only with FAT16.

SUGGESTIONS:
Use some hot glue to fixate the potentiometer (blue brick on the red PCB) and the wires on the TFT Shield.
6  Using Arduino / Storage / microSD SD connector faulty on: December 11, 2012, 04:56:16 am
TFT LCD Mega Shield V1.2 with SD card connector is not working for SD card.
NOTE: The wiring or routing is wrong SCK and MOSI is switched on the Shield (red PCB).
The best approach is to solder and remove the resistors and the connector.

The setup is MEGA 1280 + TFT LCD Shield + 2.4" TFT Display with SD card slot.
NOTE: Remove the SD card connector & resistors on the display module (blue PCB).

SOLUTION:
Solder a new SD card connector to the SHIELD.
SD card pin     SHIELD (pin)
1 (CS, SS)        53
2 (DI)              51
5(SCK)            52
7(DO)             50

3,6 GND
4 3.3V

The SD Library works with both FAT16 & FAT32.
The UTFTtf Library works only with FAT16.
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