Using SX1509 I/O Expander Board with FED3

[Kyle O'Berry]

Hey, I am trying to utilize the I2C expander ports on the FED3 to add an expander board. My hope is to incorporate a capacitive touch sensor so mice have to first touch the sensor before pokes to the FED will yield a reward. But I am unsure of how to modify the FED library so that it can read inputs from the SX1509 expander board. Any help would be greatly appreciated. Thank you!

[王策群]

Hi  Kyle,

I tried the SX1509 before,  you can learn the code from the Sparkfun here.

1. you have to install the lib: SparkFun SX1509

2. 

I put this into the FED3.h :   #include <SparkFunSX1509.h>

and the example code like this:

Best,

Jon

Kyle O'Berry <kob...@andrew.cmu.edu> 于2024年7月16日周二 03:40写道：

Hey, I am trying to utilize the I2C expander ports on the FED3 to add an expander board. My hope is to incorporate a capacitive touch sensor so mice have to first touch the sensor before pokes to the FED will yield a reward. But I am unsure of how to modify the FED library so that it can read inputs from the SX1509 expander board. Any help would be greatly appreciated. Thank you!

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[Alex Legaria]

Hi Kyle,

Another possibility is to use the BNC pins as an input and then just read the pin without any additional modifications using digitalRead(). To do this, you can connect the capacitive touch sensor to A0, 3v, and ground (pink, red and green on the picture below). 

So the code (or pseudo-code), would go like this:

Hope this helps.

Best,

Alex Legaria

[Kyle O'Berry]

Thank you so much Jon that worked perfectly. The capacitive touch sensor is now able to interact with the FED!

[Kyle O'Berry]

Hey Alex thank you so much for the suggestion! That was my original idea but I also need to use the BNC as an output to interface with my fiber photometry system so they are unfortunately not available to use an input at least I think. I am very new to this sort of thing so apologies if that is incorrect but thank you again for your suggestion!