Dave, Results are very much dependent upon distance and obstructions. 2 to 5 meters seem to be the sweet spot. I tried modules with the antenna build into the board without much success. Switched to a 10cm 2.2 dBi and am now considering switching to a larger 5 dBi antenna. I transfer asynchronous unformated data, essentially a wireless modem. One device is a master that periodically, 10msec or input buffer full, transmits a message. The slave responds with data in the ACK packet. 32 byte message are somewhat limiting and I have not determined the optimum to delay between re-transmissions. My current master is a pic18f2620 with all assembler code while the slaves are a mixture of the 18f2620 and dsPIC's written in C. I know there are reties but have lost the document where I recorded performance statistics. While typing this email the radios have been flawless transmitting approx 150 bytes every 200msec at 1 meter apart. George I On Mon, 2010-05-03 at 21:21 -0400, Dave McGuire wrote:
On May 3, 2010, at 8:29 PM, George M. Gallant wrote: > Attached is a symbol for the NRF24L01. I have not used it because > I lack the tools/skills to populate the QFN package and the > assembled > modules are sufficient for my needs. Thanks George! I've done a couple of QFNs (big Atmel flash chips around 2002 or so) and they didn't give me any trouble. I'm doing firmware development with the assembled modules, but I'm building the chip into a commercial design so cost and size have become a big factor. Have you had good luck with the chips so far? -Dave
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