All Questions
Tagged with expander raspberry-pi
6 questions
0
votes
2
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237
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Using MAX7301 GPIO Expander for Raspberry Pi Switching and Chip Selecting
I'm designing a PCB that uses Analog Devices' MAX7301AAX GPIO Expander IC to expand the Raspberry PI's GPIOs.
Digikey MAX7301
The reason I'm using this IC is that my application requires a lot of ...
- 1
2
votes
0
answers
115
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Using an MCP23008 IC with a 4X4 matrix keypad on a Raspberry Pi [closed]
I want to be able to free up the native GPIO pins on my Raspberry Pi Zero. I know the MCP23008 gives me 8 extra pins, but I can't seem to find any resources on using the additional pins with a 4X4 ...
- 21
3
votes
1
answer
908
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How to read SAA1064 7-segment values
I have a central heating system that displays it's info and error codes on 4 7-segment displays. These displays are driven by a SAA1064, like so:
This SAA1064 (datasheet here) receives it's ...
- 329
3
votes
3
answers
1k
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Do you always need a GPIO expansion chip when using i2c?
SUMMARY:
I'm trying to learn the basics of understanding how to wire up a simple circuit using the i2c. I'm wanting to build just a simple project involving an LED and a push button with my raspberry ...
- 1,049
1
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1
answer
919
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How do I connect non-I2C devices to an I2C bus?
I'm quite new to electronics and just trying to do my first Raspberry Pi based system: one diode, one pressure sensor and LCD 1602 with keypad shield (the one for an Arduino board). The way I'd like ...
- 113
0
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2
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759
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Multiplex two I2C ICs into four 7 Segment displays
I currently have two PCF8574AN I2C 8-bit IO expander ICs. Is there a way I could have two seven segments be driven off one IC (So i could run four seven segments displays off the two ICs that I have). ...
- 313