has this been tested with POE hats or any other existing hats?

I originally installed a 3 relay contactor hat, but quickly grew out of that. I had to upgrade the power supply (Mean Well MDR-60-5) to 60 watts which powers the Pi (bypassing the micro USB port), 16 relay contactors (not all used), 8 sensors, and 4 3.3v step down regulators. The Pi is not a very good power source, especially 3.3v. All the gear is mounted on C45 DIN rails to avoid breadboards. All wire junctions are screw down like the this hat. Also the LEDs were very helpful in debugging. The code and it's relationship to the GPIO is quite complex. Latency and hysteresis were an ongoing challenge. I wouldn't cover the LEDs with another hat.

According to diagram, the posts appear to be one way (diode) from the gpio head. can i send signal back to the pi from this breakout?

The diode is a led. Set the GPIO pin of your choice to output and the led will show the state of the output of that GPIO pin. Set the GPIO pin of your choice to input and the led will show the state of whatever is input to that GPIO pin.

What are the length and width of the connector that fits onto the 40-pin header? I want to see if it will fit through the slot in the top of my case.

This is not the answer I was looking for. I would like to see if I can use this breakout box with the cover installed on my Raspberry Pi case. It has a slot 55 mm long X 8 mm wide. Will the header connector fit through this slot?

Will it work with Pi Zero W?

Yes, the item can support Pi Zero W, But only two screw holes can be fixed.

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HCDC RPi GPIO Status LED & Terminal Block Breakout Board HAT for Raspberry Pi A+ 3A+ B+ 2B 3B 3B+ 4B

HCDC RPi GPIO Status LED & Terminal Block Breakout Board HAT for Raspberry Pi A+ 3A+ B+ 2B 3B 3B+ 4B

Product ID: 377130319

Details

Connector Type
Screw
Current Rating
3 Amps
Item Pitch
3.5
Mounting Type
PCB Mount
Number Of Contacts
40

🔴3.3V power LED indicator

🔵5V power LED indicator

🟢GPIO status LEDs

24073 Ft

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Description

💡 Light Up Your Pi Projects with Precision & Style!

INSTANT GPIO INSIGHT - One-to-one LED mapping with Pi's 2x20 pin header for real-time logic level monitoring.
PLUG PLAY ASSEMBLY - Pre-soldered and assembled for effortless installation on Raspberry Pi A+/3B+/4B models.
ULTRA LOW POWER LE DS - Each LED draws only 0.1mA, ensuring zero interference with GPIO signals.
ROBUST SCREW TERMINALS - Supports 26-16 AWG wires with secure M2 steel screws for clean, reliable connections.
COMPACT DURABLE DESIGN - Premium copper and nylon materials with 8mm pin header height for sleek, stable mounting.

The HCDC RPi GPIO Status LED & Terminal Block Breakout Board HAT is a pre-assembled, plug-and-play expansion board designed for Raspberry Pi models A+, 3A+, B+, 2B, 3B, 3B+, and 4B. It features dedicated LEDs for 5V (blue), 3.3V (red), and GPIO pins (green) that provide instant visual feedback on pin states without affecting signal integrity thanks to ultra-low 0.1mA LED current. The board includes robust 3.5mm pitch screw terminals compatible with 26-16 AWG wires, ensuring secure and clean wiring. Crafted from copper and nylon with a compact 8mm pin header height, it’s ideal for debugging, prototyping, and permanent installations where reliability and clarity matter.

Specifications

ASIN	B08RDYDG6X
Best Sellers Rank	#58,927 in Computers & Accessories ( See Top 100 in Computers & Accessories ) #428 in Motherboards
Brand Name	HCDC
Colour	blue, red
Connector Type	Screw
Country of Origin	USA
Current Rating	3 Amps
Customer Reviews	4.8 4.8 out of 5 stars (320)
Item Dimensions W x H	6.5W x 2.8H Centimeters
Item Weight	0.01 Ounces
Manufacturer	Xiken Electronic Technology Co., Ltd.
Material Type	Koper, Nylon
Model Number	HD040
Mounting Type	PCB Mount
Number Of Contacts	40
Number Of Poles	40
Number of Items	1
Number of Positions	40
Part Number	HD040
Pitch	3.5 Millimeters
Voltage	3.3 Volts

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24073 Ft

Duties & taxes included

In stock

Sold byAmazon HungaryDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hungary.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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