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switch interface to AVR
You can add a transistor that turns the led on and off. Otherwise the forward voltage of the LED will prevent you from registering that a button has been pushed. I've made a (very...
Wednesday, 21 July 2010 - 12:51
Tough Operator Interface Device--16 pos. selector?
You could do buttons to increment and perhaps decrement in tens and ones. It's not as intuitive, but at least it's tried and tested.
Tuesday, 20 July 2010 - 20:51
ATmega168 situation?
Actually apart from the ordering number, these devices are so alike i was referring to the A/P/PA models. And in the TQFP package they aren't really available either. The TQFP...
Tuesday, 20 July 2010 - 00:04
ATmega168 situation?
Nah, demand is just higher than supply atm. Just be glad you're not in the market for the dataflash at45db series. I just needed spare parts for some stuff, and i got told i...
Monday, 19 July 2010 - 22:15
Is an LED driver practical?
In the datasheet, you usually have graphs for relative luminous intensity as a function of current and as a function of temperature.
Monday, 19 July 2010 - 20:55
RS485 Termination Resistance and Reflections
You could try the good old-fashioned trial and error :)
Monday, 19 July 2010 - 19:32
ATMEGA8 boad layout
wbg_1000 wrote:I use ATMEGA8L. Another thing though :D I understand the theory that decoupling capacitor offer a low inductance energy storage for fast switching currents...
Monday, 19 July 2010 - 17:34
Is an LED driver practical?
Some pros of using a constant current boost led driver: You can nearly deplete the batteries before the led stops emitting light. You can combine it with pwm to vary the intensity...
Monday, 19 July 2010 - 17:03
Question (not!) about global variables (but macros)
#defines are not global variables, they are preprocessor macros. And header files are usually where you write these. If you are using AVRstudio with gcc, F_CPU is automatically...
Sunday, 18 July 2010 - 20:26
How to network AVR devices with RS485?
You can get RS232 to RS485 converters that does auto transmit enable, but that still requires you to make sure that only one device is transmitting at any given time.
Friday, 16 July 2010 - 18:57
USART not transmitting properly
When the AVR is reset, the usart pins are floating until initialized. It's not uncommon to get garbage from that. You could try putting an external pull-up resistor (50k-100k) on...
Friday, 16 July 2010 - 18:50
Please critique hopefully my last board revision...
alank2 wrote: lagger: Yes, push buttons are all the rage on this board! I am software debouncing all of them independently. Which reference design on which page? I see what...
Thursday, 15 July 2010 - 18:12