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Electrical Engineering

Questions tagged [expander]

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Questions regarding Port or IO Expanders, be it I2C, SPI, 1-Wire, serial/uart or similar. Shift-Registers are normally NOT considered Expanders, and have their own tag.

70 questions
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1 vote
2 answers
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Circuit design using PCF8574, SN74HC05 and 2N7000 I (a hobbyist) would be glad if you can help me with following: I want to switch multiple external relays. In lack of ports, I decided to use the ...
al3c00's user avatar
  • 13
0 votes
1 answer
158 views

I'm currently trying to control an array of MOSFETS so I can drive several solenoids. I'm using the Boron from particle.io as my main board, the PCF8575 as my I/O expander, the MAX3004 as a level ...
David O's user avatar
  • 1
0 votes
0 answers
96 views

I am using GPIO expanders (MCP23017) for an array of buttons. Each button is connected between GND and an input pin of the expander. I've enabled the 100k internal pull-up resistor on the MCP23017 (...
Nate.Olson's user avatar
  • 3
0 votes
1 answer
237 views

I'll be using an Arduino Nano 33 IoT together with three PCF8574 IO expander boards. I've managed to connect two PCF8574s together and communicate to each of them individually at different address ...
Arduino Rookie's user avatar
  • 1
0 votes
1 answer
227 views

I am trying to use the MCP23017 expander chip with a Metro Mini by Adafruit (pinout below) and I can't get the microcontroller to connect reliably via I2C. update I connected the RESET pin to 5V and ...
Lil Mami Chula's user avatar
  • 321
1 vote
1 answer
912 views

I am more of a software guy, and I want to make sure my design works before sending it off to fabrication. I need to interface with 24V PLC I/Os. I want a simple design for now, as I can add ...
codecarbo's user avatar
  • 13
1 vote
3 answers
439 views

I'm switching a 5V 200mA case fan with a PCF8574. Since this expander is best used as a current sink (it can sink 25mA, but I think it can only supply something like 300uA), I supposed that a PNP ...
Nick Bolton's user avatar
  • 2,203
6 votes
1 answer
708 views

I'm using the MCP23017 16-bit I2C GPIO Expander in combination with the microcontroller PIC18F47J53. Both products are from Microchip. Datasheet MCP23017 Datasheet PIC18F47J53 I use MCC (MPLab Code ...
Hans Billiet's user avatar
  • 329

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