🔧 Elevate Your Arduino Game with 16 I/O Ports!
The 10pcs PCF8575 IO Expander Board Module is a versatile I2C to 16 I/O extension shield designed for Arduino R3 and other MCUs. It operates within a voltage range of 2.5 - 5.5VDC and supports a maximum current of 100mA. With 16 individually addressable pins, this module allows for flexible input/output configurations and features an open-drain interrupt output for efficient input change notifications.
D**R
Great module - Note that Interrupt Pin usage requires an external pullup resistor.
I like the extra 8 ports on this module compared to that of the PCF8574 modules also found on Amazon.Purchasers should be made aware that the PCF8574 modules here on Amazon with the Red circuit board (The ones that don't have a 2nd connector for linking modules together) have a built-in 1K pullup resistor on the interrupt pin where as the Blue circuit boards (have 2nd connector for linking) do not have the pullups.I've used the Red PCF8574 modules here (https://www.amazon.com/gp/product/B01ICN5JB6/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1) and they work perfectly with Raspberry Pi.But, for these PCF8575 modules, I could not get interrupts to work properly without the external 1K pullup resistor to VCC on the INT pin. This is because the INT pin is open-drain and goes LOW only when activated (see the PCF8575/8774 datasheets). This behavior means that multiple interrupt pins can be connected to a shared GPIO pin on the controller but do require that the GPIO pin has a pullup resistor between the pin and VCC. For the Raspberry PI, I simply added a 1K pullup and all was well.
J**.
excelente producto
era lo esperado
R**N
2 of the 3 worked great
1 of the 3 has several I/O pins that don't work.
S**K
Does what you expect and nothing stupid.
This was exactly what I wanted. The breakout board brings the part leads out to 0.1", .040 pins so that you can breakboard or build a perfboard prototype with it. Perfect for making a proof-of-concept for my client.
A**R
Only 11 out of 30 boards will power up.
The media could not be loaded. I ended up buying 3 sets of 10 boards. The first batch, only 4 boards will power up. The other 6 will not respond to the I2C buss. No address reported on scans. One board I measured the output of the 3.3V regulator and it only has 1.4v and drawing 5.1mA vs a normal boards 1.7mA.Second batch only 5 worked with 2 only working at a specific address (0x20 and 0x27).Third set, only 4 worked.Then I started testing IO ports. So far I've only tested output and of the 30 boards, only 5 boards do all the outputs work.
M**D
Works as expected w/ arduino PCF library
This simplified connection from an arduino to a sixteen port relay driver and bank of switches.
G**N
Simple IO expanders, work great
Exactly as described, chips are legitimate, work as expected.
N**6
Great IO Expnader Board
Nice to have IO Expander Board made & ready so it does not delay the project in the process of obtaining one.
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