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Light sensor

Former Member over 10 years ago

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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bobcroft over 10 years ago +1

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…

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0 pmohan over 10 years ago

If you have no choice but to use 40 IO Pins, then as Shabaz said above you need to look in to I2C.. For example look at expanding the I2C Port by using TI 8574, 8575, 9555 or MCP 23017

http://playground.arduino.cc/Code/I2CPortExpander8574

http://tronixstuff.com/2011/08/26/tutorial-maximising-your-arduinos-io-ports/
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0 pmohan over 10 years ago

If you have no choice but to use 40 IO Pins, then as Shabaz said above you need to look in to I2C.. For example look at expanding the I2C Port by using TI 8574, 8575, 9555 or MCP 23017

http://playground.arduino.cc/Code/I2CPortExpander8574

http://tronixstuff.com/2011/08/26/tutorial-maximising-your-arduinos-io-ports/
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