But the MTS300 isn't independent from the radio, they share a pin (Port E6/FIFOP/Int2), which turns on the temp sensor. Reading the photo or temp sensor (which in turn share the same ADC line) does not provides accurate values while the radio is on.
I tried using low power listening and the reading problem was still there that's why I asked if the radio was completely off or just some part of it. The duty cycle I used was just 2% (so 2% was also the probability that the reading was done with the radio on). Also, what is the period of the duty cycle? For example, if I set the duty cycle to 2%, is it on for 20ms and off for 980ms, or on for 10ms and off for 490ms, or something else? A final question, about the "synchronization": how does it work with Dissemination? If Dissemination uses broadcast to send messages, no ACKs used, there is no way to know if some node got the the message. Thanks in advance Hugo Sousa On 6/4/07, David Moss <[EMAIL PROTECTED]> wrote:
TEP 126: http://www.tinyos.net/tinyos-2.x/doc/txt/tep126.txt The current implementation is asynchronous low power listening - there's no synchronization going on. The packets get retransmitted until the receiver wakes up and detects the transmission. The MTS300 is independent of the radio. The radio goes into power down mode, where that chip is off. Your node's microcontroller SPI bus and everything else is still operational as needed by other components. -David -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Hugo Sousa Sent: Monday, June 04, 2007 5:54 AM To: [email protected] Subject: [Tinyos-help] Questions about low power listening in CC2420 Where can i read a bit about tinyos' implementation of the radio low power listening mode? How does it handle the packet-loss-while-sleeping/radio-wakeup-synchronization issue with the other nodes? What part of the radio exactly does it turn off? Because it seems it still interferes with the temp and photo sensor in the mts300 sensorboard (because they share a pin) thanks in advance Hugo Sousa _______________________________________________ Tinyos-help mailing list [email protected] https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
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