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Light sensor

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I want to connect 40 light sensors to my Arduino .Is there any possibility to connect all together without mega arduino?I really appreciate if any one could give me advice, tutorial or…

 

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    Mehrnoush,

                        what you need is a CD74HC4067 16 channel analog multiplexor, well actually three for 40 inputs.  There is a tutorial on www.tronixstuff.com.  Sparkfun used to make a break out board for this IC too.  I am assuming you light sensors are analog, something like photosensitive resistors.

     

    As Peter said if you could use the MEGA then 3 of these with 16 channels of analog would give you phenomenal processing capacity and flexibility..  You could link them using I2C and the EasyTransfer library.  In the Uk clone Mega's can be bought for about £10 and for less from China.  I really doubt you will beat that to achieve a 40 channel system especially when you consider the bulk of the system is already built for you.

     

    Bob

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    Mehrnoush,

                        what you need is a CD74HC4067 16 channel analog multiplexor, well actually three for 40 inputs.  There is a tutorial on www.tronixstuff.com.  Sparkfun used to make a break out board for this IC too.  I am assuming you light sensors are analog, something like photosensitive resistors.

     

    As Peter said if you could use the MEGA then 3 of these with 16 channels of analog would give you phenomenal processing capacity and flexibility..  You could link them using I2C and the EasyTransfer library.  In the Uk clone Mega's can be bought for about £10 and for less from China.  I really doubt you will beat that to achieve a 40 channel system especially when you consider the bulk of the system is already built for you.

     

    Bob

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