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===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.
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[[Image:Screenshot of Turtle Art Activity pulse-1.png]]
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You need to experiment with the constant 3000 or the distance from the light to get the display onscreen.
    
==Photovoltaic panel==
 
==Photovoltaic panel==
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