2,486
edits
Changes
Activities/Turtle Art/Using Turtle Art Sensors (view source)
Revision as of 22:45, 20 July 2011
, 22:45, 20 July 2011→Using the LDR to measure your pulse
===Using the LDR to measure your pulse===
===Using the LDR to measure your pulse===
Each heartbeat temporarily increases the amount of blood in your fingertip. Cover the LDR with your fingertip and hold near a bright light. You can see your pulse as a variation in the measured resistance.
Each heartbeat temporarily increases the amount of blood in your fingertip. Cover the LDR with your fingertip and hold near a bright light. You can see your pulse as a variation in the measured resistance.
[[Image:Screenshot of Turtle Art Activity pulse-1.png]]
You need to experiment with the constant 3000 or the distance from the light to get the display onscreen.
==Photovoltaic panel==
==Photovoltaic panel==