https://github.com/tophercantrell/ioexpanderrpi

The SparkFun Breakout for SX1509
https://github.com/tophercantrell/ioexpanderrpi

raspberry-pi sx1509

Last synced: about 7 hours ago
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The SparkFun Breakout for SX1509

• Host: GitHub
• URL: https://github.com/tophercantrell/ioexpanderrpi
• Owner: topherCantrell
• Created: 2018-10-19T10:27:19.000Z (about 6 years ago)
• Default Branch: master
• Last Pushed: 2018-11-04T13:21:11.000Z (about 6 years ago)
• Last Synced: 2024-11-17T10:17:12.973Z (about 7 hours ago)
• Topics: raspberry-pi, sx1509
• Language: Python
• Size: 5.99 MB
• Stars: 3
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Adding an I/O Expander to the Pi

The SparkFun Breakout for SX1509:


https://www.sparkfun.com/products/13601

SparkFun's tutorial:


https://learn.sparkfun.com/tutorials/sx1509-io-expander-breakout-hookup-guide

Datasheet for the SX1509:


https://cdn.sparkfun.com/assets/learn_tutorials/4/3/4/sx150x_789.pdf

Keypad from Adafruit:


https://www.adafruit.com/product/3845

## Schematics

![](art/schematic.jpg)

## i2C

The boards have solder-pad jumpers for configuring the I2C addresses. I left one

of the boards alone at 00 for the address 0x3E. On the other board I cut the

ADD0 trace to 0 and soldered it to 1. That's 01 for the address 0x3F.

```

pi@tink:~ $ i2cdetect -y 1

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f

00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 

10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- 3e 3f 

40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

70: -- -- -- -- -- -- -- --                         

``` 

## Testing

![](art/testing.jpg)