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How to send on/off zigbee command using at86rf231 transceiver.
Why would anyone choose Zigbee rather than simple 802.15.4 messaging, for a simple project?   Usually, the answer is "Because they didn't know what they didn't know."...
Saturday, 14 February 2015 - 22:13
30MHZ SPI over long distance or add some AVR's for local control, and lower speed.
Aren't AVR SPIs limited to like 1/2 or /14 of the clock speed? How could you get 30MHz SPI clocking on an AVR?  
Saturday, 14 February 2015 - 20:08
AVR for ANALOG video transmitting to pc through Ethernet
Can you complete some simpler projects before taking on this complex one?  
Saturday, 14 February 2015 - 19:51
Preemptive vs. Cooperative Multitasking
  FreeRTOS has an option for cooperative scheduling rather than preemptive. I normally use cooperative scheduling - so I don't have to worry with deadlocks and mutual...
Friday, 13 February 2015 - 06:27
[Solved] Suggestions for troubleshooting ethernet chip (ENC28J60)
Yes, it's another Microchip antique.   WizNet 812MJ or 820 - offloads all the protocols from the microprocessor to the ethernet NIC. Huge simplification. They just work. THey...
Thursday, 12 February 2015 - 03:18
Xplained 1284p UART problem [Solved]  
Sunday, 8 February 2015 - 22:17
USB to Serial Converter project from LUFA - Connected and disconnected
The usual way this is done is with flow control. This prevents the sender from overrunning the receiver, where the receiver could but doesn't keep up. Hardware flow control in...
Wednesday, 4 February 2015 - 08:35
AVR Xmega 64 bits floatting point support
64 bit floating point on an 8 bit AVR - not going to be very fast!   the usual solution for more accuracy is not brute force 64 bit doubles, but rather, re-think the...
Tuesday, 3 February 2015 - 20:49
Wireless switch (700 ft)
I use and recommend these and this sophisticated software for reliable datagrams and popular sub-GHz radios for telemetry http://www.airspayce....
Monday, 2 February 2015 - 01:39
Implementing single wire UART Comms
you can't turn off the receiver in this kind of UART. TXC true is not enough. You need to know when, or delay until, the last STOP bit of the last char in the structured message...
Monday, 2 February 2015 - 01:34
Implementing single wire UART Comms
Some microprocessors support a HALF-DUPLEX mode in their UART. Also used for ISO 7816 smart cards which use half-duplex asynchronous UARTs.  I suspect Atmel's low end Cortex...
Sunday, 1 February 2015 - 23:19
Wireless switch (700 ft)
700 ft. I would not use 802.15.4 2.4GHz modules unless you can elevate antennas at both ends to be above treetops and you can put 12dBi gain patch or yagii antennas at each end....
Sunday, 1 February 2015 - 22:36