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: 273923509

Details

Brand
HCDC
Color
blue red
Connector Type
Screw
Current Rating
3 Amps
Gauge
26.0
Item Pitch
0.14 Inches

🔴3.3V power indicator LED

🔵5V power indicator LED

🟢GPIO status LEDs

S$35

Duties & taxes included

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Description

💡 Light up your Pi’s potential with instant GPIO clarity!

INSTANT GPIO INSIGHT - One-to-one LED mapping with 40-pin GPIO header for real-time logic level monitoring.
ULTRA LOW POWER LE DS - Each LED draws only 0.1mA, ensuring zero interference with GPIO signals.
COMPLETE MOUNTING KIT - Includes nylon standoffs and nuts for easy, stable panel mounting and integration.
ROBUST TERMINAL BLOCKS - 3.5mm pitch screw terminals support 26-16 AWG wires for secure, professional connections.
UNIVERSAL PI COMPATIBILITY - Seamlessly supports Raspberry Pi A+, 3A+, B+, 2B, 3B, 3B+, and 4B models.

The HCDC RPi GPIO Status LED & Terminal Block Breakout Board HAT is a precision-engineered accessory designed for Raspberry Pi models A+ through 4B. Featuring dedicated LEDs for 5V (blue), 3.3V (red), and GPIO signals (green), it provides immediate visual feedback on pin states without disrupting signal integrity thanks to ultra-low 0.1mA LED current. Its 3.5mm pitch terminal blocks accommodate a wide wire gauge range (26-16 AWG) with secure screw connections, while the included mounting hardware ensures professional installation. Ideal for developers and engineers seeking rapid diagnostics and clean wiring in their Pi projects.

Specifications

ASIN	B08RDYDG6X
Best Sellers Rank	#468 in Single Board Computers (Computers & Accessories)
Brand Name	HCDC
Color	blue, red
Connector Type	Screw
Current Rating	3 Amps
Customer Reviews	4.8 4.8 out of 5 stars (345)
Gauge	26.0
Item Dimensions W x H	2.56"W x 1.09"H
Manufacturer	Xiken Electronic Technology Co., Ltd.
Material Type	Copper
Model	HD040
Mounting Type	Panel Mount
Number Of Contacts	40
Number Of Poles	40
Number of Positions	40
Part Number	HD040
Pitch	0.14 Inches
Voltage	3.3 Volts

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