Thanks otsuka, I modified the TIME_SCALE and MAX_SAMPLERECORDS value. Now I'm able to collect data until 1000Hz.
Ing. Alessandro Balvis ------------------------------------------- Centro Ricerche ENEL - Pisa [EMAIL PROTECTED] ------------------------------------------- -----Messaggio originale----- Da: otsuka takuya [mailto:[EMAIL PROTECTED] Inviato: martedì 21 novembre 2006 16.12 A: Balvis Alessandro (EXT DP TOS) Cc: [email protected] Oggetto: Re: R: [Tinyos-help] 2kHz on MDA300 Hi, http://www.ne.jp/asahi/nature/jp/tinyosMDA300.htm A report from this site says the MDA300 can adc at 100Hz by setting ANALOG_SAMPLING_TIME to 1 and TIME_SCALE to 10. Note that Not by setting ANALOG_SAMPLING_TIME to 0.1 and TIME_SCALE to 100. You should also comment out function calls of unnecessary adc ports and set MAX_SAMPLERECORD to smaller value in the sensorboard.h according to the site. I'm not sure you can do adc at 2kHz by this way.... http://www.ne.jp/asahi/nature/jp/MDA300details.htm This also says MDA300 has ADS7828EB and its datasheet says it achieves 50kHz sampling rate. http://www.ne.jp/asahi/nature/jp/ I think this site is useful but only in japanese. Hope you have someone who speak japanese around you.... > Thanks for the advice, > but changing that value works and I tested that 1 correspond to 1/10 of > second (10Hz), like the Crossbow support says. > I tried smaller value hatn 1, for example 0.1, but it doesn't work, tha > application works always to 10Hz, it seems can't recognize smaller value. > I noted that in the SamplerM.nc there is a getcontinuousData command not > implemented. I wrote to the author (Mohammad Rahimi) asking if it's possible > implement that command, but he didn't answer me. > > It's a long time I'm working with the MDA300 and MDA320 (with the xbow > devices, in fact...) and with the DAQ I tried different ways. > > I think that is necessary to write something at the component level. > > Ing. Alessandro Balvis > ------------------------------------------- > Centro Ricerche ENEL - Pisa > [EMAIL PROTECTED] > ------------------------------------------- > > ________________________________ > > Da: Tony Han [mailto:[EMAIL PROTECTED] > Inviato: luned・20 novembre 2006 16.45 > A: Balvis Alessandro (EXT DP TOS) > Cc: [email protected] > Oggetto: Re: [Tinyos-help] 2kHz on MDA300 > > > I am not sure if their hardware support higher data rate, but in > XSensorMDA300M.nc, you can try to change ANALOG_SAMPLING_TIME to a small > value, also, in the SampleM.nc, change TIME_SCALE to 1. this will increase > your sampling rate as well as data transfer rate. > > Tony > > > On 11/20/06, Balvis Alessandro (EXT DP TOS) <[EMAIL PROTECTED]> wrote: > > Hy, > > I would know if someone can me help for implement a function to sample > with MDA300 and MicaZ at 2kHz on the analog channel (or the differential). I > asked to Crossbow, but they answered me that the hardware is capable to work > at that rate, but they haven't developped the driver. > > I tried to see the entire components in the MDA300 driver directory, > but I'm not very able to modify some of it. Crossbow said me too, that I need > to modify only the Sample driver. I checked only that the max sampling rate > is 10Hz passing the "interval argument" to the getSample command. > > I searched some pre-definied value (for example something like a > pre-scaler) to modify the clock rate of the ADC, but without results. > > Any kind of advice will be appreciated. > Thanks. > > Ing. Alessandro Balvis > > > > PS: I post the Crossbow answer > "Most of our XMesh based apps are geared towards low power, low data > rate. We don't have anything that is tested for data rates >3 Hz. You can > certainly try to modify the XSensorMDA300 app and see if you can get it to > work at 10Hz rate. The MDA300 hardware is capable of sampling up to 2 kHz" > > ------------------------------------------- > Centro Ricerche ENEL - Pisa > [EMAIL PROTECTED] > ------------------------------------------- > > > _______________________________________________ > Tinyos-help mailing list > [email protected] > > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-h > elp > > > > -- otsuka takuya <[EMAIL PROTECTED]> _______________________________________________ Tinyos-help mailing list [email protected] https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
