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Everything posted by kxenos

  1. Take a look here http://blogs.arm.com/software-enablement/498-from-zero-to-boot-porting-android-to-your-arm-platform/ and here http://www.olimex.com/dev/index.html see "SAM9-L9261" under "ARM" category on the left. For buying stuff, depending on where you live, check Distrelec, Digikey, Mouser, Element14, Farnel or RS components. Also check ebay for some cheap (chinese) development boards though I wouldn't recommend them as a first project solution. google is your F1...
  2. ok, ok. We got it. It's not that difficult anyway. ARM processors are your best bet, I believe. Cortex M3, A7 and A9 will all do fine. Buy a development board either from a processor manufacturer (atmel, nxp, ti, nxp etc.) or an other vendor like olimex, keil iar etc. When your software is ready, copy the schematic of the dev. board you used and add or remove features accordingly. Kostantinos
  3. Hello, I wanted to put this project into Projects area but couldn't find the link so here it is. This schematic is part of a bigger project that was never completed. That means it's not complete, meaning that even though I believe that it will work ok, it has not been constructed. The firmware is not done also. Think of it more as a base or a starting point, if you want to start a project like this. The main functional requirements were 1. A regulated 3.3V @ 800mA power supply 2. Embedded 2 cell Li-ion battery pack 8.2V or 8.4V 3. Device should be usable even when battery is charging 4. User s
  4. In 5 days I'm going to Uganda. We 're going to set up a small hospital in rural village on a mountain about 4500km alt. The major problem about infrastructure there is that there is no power supply. Because of this there is no refrigerator to store medicines, the microscope I just bought will work only until it's battery is discharged, and the people there are totally disconnected from the rest of the world. And because there are many places like this in these countries, it came to me that if I could install a solar panel and a rectifier/battery charger/inverter in the so called hospital (actu
  5. I would suggest that you start by picking a suitable servo for your application. After this you will probably want to select a driver IC suitable for your motor. In order to select the driver IC you will have to think about the system that will tell the servo to move. Is it digital? Like a uC? Is it something simpler like a user pressing a button? When you start designing an application you start by the functional requirements. What do you want your system to do. The specs. After this you have to think about the non-functional requirements - if any. After this you start with a rough block desi
  6. Probably the IC that came with the kit is of wrong type. (probably someone equally unlucky will have a board with 14 holes and an IC with 8 pins, and his kit also won't work). Try to google every code the board has on it in order to find the manufacturer and send them an e-mail. :-) Konstantinos
  7. If the PC doesn't already have a dev. driver for the device, your device has to send a mass storage media report so that it will be recognized as a flash drive so that the driver and/or the application can be installed. If you just want to bypass the usb lock that the admin or a script has done (usually through HKLM\SYSTEM\CurrentControlSet\...\...) you have to find an other way (and I think there are a couple or so). Usually admins or antivirus programs know what they are doing when they lock things down. As an admin myself, I hate it when people (or poorly implemented drivers or modules) com
  8. My suggestion is: Use an ARM uC to capture, encode and store the signal into an external eeprom. Use an open source speech codec like SPEEX which is perfect for encoding speech with excellent quality into bitrates of 2kbps, 4kbps etc. With 8kbps you will have perfect results. With 8kbps audio bitrate, if you want to store 5min of audio you need 5min * 60sec = 300sec. 300sec * 8kbit/sec = 2400kbit or 300KB of data. Take a look at ST micro cortex M3 which is STM32*. There is an application note that does exactly that. It has the audio circuit around the uC for line input and line output. OLIMEX
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