Robots w/Lasers

July 17, 2007

Heart Monitor for NDS

I have a prototype of the hardware side of my Nintendo DS-based heart rate monitor. I’m using the awesome DSerial to interface an IR LED & IR phototransistor to the DS.

It works ok, but the signal is not strong enough. Slight movements can make the data unusable. I think I need to work on either amplifying the signal, or increasing the sensitivity of the DSerial. Also I need to rig up some velcro to stick the sensor to your finger, so you don’t have to hold it in place.

Here you can see my “sensor”:

Here is the connection to the DS:

And finally, here is a screenshot of the DS’s lower screen, which is just graphing the data coming from the DSerial’s ADC:

Check out this movie of it in action: dserial_heart_monitor.avi (1.5MB)

Filed under: DSerial,Hardware,Nintendo DS — davr @ 12:29 pm

July 1, 2007

Fast Intel SSD

The Intel X25-M SSD is pretty much the fastest on the market. You can buy it by clicking here:

Intel X25-M Mainstream 80 GB SATA 2.5-Inch MLC Solid State Disk (SSD) SSDSA2MH080G1C5

Check out this benchmark at, especially the random write performance. It completely blows away the competition.

Filed under: Uncategorized — davr @ 8:28 am

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