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EEdwa2
Beginner
1,083 Views

Multiple sensor inputs to Edison

I'd like to clarify my understanding about managing multiple sensor inputs to the Edison using the mini breakout board. In my application, I'd like to read the inputs from two pressure transducers such as https://www.amazon.com/gp/product/B00RCPDPRQ/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 this one, which outputs between 0.5V and 4.5V in an analog signal. I take it that I need an ADC for this type of output to be recognised by the Edison. I'd also like to read the output from a load cell like http://a.co/1W0DO6e this, which is routed via https://www.itead.cc/hx711-dual-channel-weighing-sensor-module.html this load cell amplifier. It appears that each of these three requires access to a pair of I2C pins (SCL and SDA). Is this the case, and if so, does this mean it is only possible to connect 2 of the 3 sensors, given that there are only 2 pairs of I2C pins on the Edison? I also note that https://www.sparkfun.com/products/13770 this board has 4 inputs, and that it also says up to 4 can be stacked. If this is true, what extra pins on the Edison is it accessing? Out of interest, how does the device address differ from the I2C pins? Basically I'd like to find out how I can connect all 3 sensors up!

On a related note, what is the behavior to be expected with these sensors if the program is not run in real time (i.e. from a Python script on Linux)?

Thank you in advance for your assistance.

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2 Replies
idata
Community Manager
55 Views

Hi redtedtezza,

Thanks for your interest in the Intel® Edison Platform.

This Sparfun Block https://www.sparkfun.com/products/13770 SparkFun Block for Intel Edison - ADC - DEV-13770 - SparkFun Electronics , won't let you connect 3 sensors through I2C, this block allows you only to connect up to 4 Analog devices like a potentiometer. If you are interested in connecting several devices through I2C I would recommend to use an I2C Multiplexer.

I found this thread where a customer connected this 8-Channel I2C http://www.ti.com/lit/ds/symlink/pca9548a.pdf http://www.ti.com/lit/ds/symlink/pca9548a.pdf to the Edison. Maybe it will be useful to you.

Hope this helps, have a nice day!

Best Regards,

 

-Jose P.
idata
Community Manager
55 Views

Hi redtedtezza,

 

 

Do you have any more questions? Please let me know in order to assist you.

 

 

Have a nice day!

 

 

Best Regards,

 

-Jose P.

 

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