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simple charge pump for -3V I have a AVR dev board that take the negative voltages from the RX (not a max232). That works fine when it's connected to a PC. Now I need two kits to talk to each other! (but... |
Thursday, 14 October 2010 - 12:03 |
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An other optimizer problem. Can anyone tell me why the volatile has to be placed there for the program to work with -OS //function unsigned int readtimer(volatile unsigned int *addr){ unsigned int temp... |
Monday, 11 October 2010 - 10:24 |
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Looking for remote with RF link and LCD I'm looking for a two way OEM RF remote with a LCD display something like a BW 128x64. I only need 3 keys or a touch screen. The battery life need to be good (but can live with... |
Tuesday, 28 September 2010 - 12:17 |
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Max volt for AT25DF081 Now when it's hard to get some dataflashes I got some AT25DF081, but did not read the hole datasheet! they a rated at max 1.95V. But the "Absolute Maximum Rating" say All input (... |
Tuesday, 6 July 2010 - 10:26 |
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Atomic problem. In ASM I'm used to have a (low)register pair I use to get data to/from an interrupt. I avoid atomic problems by only use MOVW in "main".(the interrupt can use normal 8 bit... |
Tuesday, 6 July 2010 - 09:50 |
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USB rs232 and stk500 I'm sure that this can be found somewhere in this forum but a quick search did not solve it. I have a windows (XP) on a PC without a RS232 port. Can I use a USB to RS232 with a... |
Thursday, 10 June 2010 - 07:17 |
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3.5" color display with ssd1963 I just got a winstar 3.5" 320x240 colour display with a driver board, that has a ssd1963 controller. There is a lot of setups for that chip are there any that have all the init... |
Thursday, 29 April 2010 - 20:26 |
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Metal detector Just a test to see if anyone have done this before :D Does anyone have a simple metal detector that just is a AVR and a coil (perhaps some cap's and res's). A tone on a coil (... |
Wednesday, 2 September 2009 - 13:55 |
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Divide with a constant. First I don't need this but : I can't get the GCC to make the div using mul with 1/X even at -o3 where the flag for that should be on! Is it not implemented for the AVR? (I have... |
Tuesday, 3 February 2009 - 07:32 |
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SW multiply accumulate SW multiply accumulate This is a 100% freak question Are there any one there have a fast way to multiply (and acc.) in software, using a lookup table? The only way I can make it... |
Tuesday, 20 January 2009 - 20:54 |
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Time for a quiz. Quiz time. I don’t know if it fits here but I will start it here. I think we are a good mix of new and old people in this forum, so I want to start a little quiz, so the old... |
Sunday, 11 January 2009 - 08:53 |
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Isolated switch. I need to make a isolated switch. The problem is that I don’t have any power on the switch side, and they can’t be grounded together. The idea I had was to have a tiny AVR to... |
Wednesday, 24 September 2008 - 20:56 |