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HCDC

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

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Features

  • The item has been soldered and assembled. Support for Raspberry Pi A+ 3A+ B+ 2B 3B 3B+ 4B
  • GPIO status LED and power 5V / 3.3V indication. GPIO output or input level high LED on, output or input level low LED off. 5V blue, 3.3V red, GPIOs green. The position of the LED is in a one-to-one correspondence with the position of the Raspberry Pi 2x20pin connector, and the logic level of the GPIO can be observed very quickly and intuitively. The driving current of each LED is only 0.1mA, so you don't have to worry about it affecting the read and write status of GPIO.
  • Terminal block pitch 3.5mm/0.138", wire size range 26AWG to 16AWG, strip length 5mm, screw M2 steel, pin header and cage copper. 2 x 20 pins expansion pin header, height 8mm/0.32".
  • Packing list: 1x terminal block breakout module, 4x M2.5x16mm nylon standoffs, 4x M2.5x6mm nylon standoffs, 4x M2.5 nylon nuts(NOTE: the item not include Raspberry Pi Board).

Features

  • The item has been soldered and assembled. Support for Raspberry Pi A+ 3A+ B+ 2B 3B 3B+ 4B
  • GPIO status LED and power 5V / 3.3V indication. GPIO output or input level high LED on, output or input level low LED off. 5V blue, 3.3V red, GPIOs green. The position of the LED is in a one-to-one correspondence with the position of the Raspberry Pi 2x20pin connector, and the logic level of the GPIO can be observed very quickly and intuitively. The driving current of each LED is only 0.1mA, so you don't have to worry about it affecting the read and write status of GPIO.
  • Terminal block pitch 3.5mm/0.138", wire size range 26AWG to 16AWG, strip length 5mm, screw M2 steel, pin header and cage copper. 2 x 20 pins expansion pin header, height 8mm/0.32".
  • Packing list: 1x terminal block breakout module, 4x M2.5x16mm nylon standoffs, 4x M2.5x6mm nylon standoffs, 4x M2.5 nylon nuts(NOTE: the item not include Raspberry Pi Board).

Description

1, The item has been soldered and assembled. Support for Raspberry Pi A+ 3A+ B+ 2B 3B 3B+ 4B 2, GPIO status LED and power 5V / 3.3V indication. GPIO output or input level high LED on, output or input level low LED off. 5V blue, 3.3V red, GPIOs green. The position of the LED is in a one-to-one correspondence with the position of the Raspberry Pi 2x20pin connector, and the logic level of the GPIO can be observed very quickly and intuitively. The driving current of each LED is only 0.1mA, so you don't have to worry about it affecting the read and write status of GPIO. 3, Terminal block pitch 3.5mm/0.138 inch, wire size range 26AWG to 16AWG, strip length 5mm, screw M2 steel, pin header and cage copper. 2 x 20 pins expansion pin header, height 8mm/0.32 inch 4, Packing list: 1x terminal block breakout module, 4x M2.5x16mm nylon standoffs, 4x M2.5x6mm nylon standoffs, 4x M2.5 nylon nuts (NOTE: the item not include Raspberry Pi Board).


Package Dimensions ‏ : ‎ 3.82 x 3.43 x 1.26 inches; 1.76 Ounces


Item model number ‏ : ‎ HD040


Date First Available ‏ : ‎ September 17, 2018


Manufacturer ‏ : ‎ Xiken Electronic Technology Co., Ltd.


Best Sellers Rank: #271 in Single Board Computers (Computers & Accessories)


Customer Reviews: 4.7 4.7 out of 5 stars 286 ratings


Current Rating: 3 A


Item Pitch: 0.14 inches


Connector Type: Screw


Number Of Contacts: 40


Mounting Type: Panel Mount


Material: Copper


Color: blue, red


Brand: HCDC


Voltage: 3.3 volts


Number Of Poles: 40


Current Rating: 3 A


Connector Type: Screw


Number Of Contacts: 40


Mounting Type: Panel Mount


Voltage: 3.3 volts


Number Of Poles: 40


Number of Positions: 40


Pitch: 0.14 inches


Item Dimensions W x H: 2.56"W x 1.09"H


Material Type: Copper


Color: blue, red


Brand Name: HCDC


Model: HD040


Number of Items: 1


Manufacturer: Xiken Electronic Technology Co., Ltd.


Item Weight: 0.27 g


Part Number: HD040


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Oct 11

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

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Top Amazon Reviews

    • Well built non-intrusive connections and monitoring for your GPIO pins
Since Amazon likes to combine reviews for totally different products, this review is for the HCDC RPi GPIO Status LED & Terminal Block Breakout Board HAT. I'm not sure why people complained about putting this board in a case. It is pretty obvious that many HATs will not fit inside a closed case. This board will work with a male to female 40-pin flat extender cable if you remove the two plastic posts on either side of the connector. You really don't need those posts except to permanently attach it to the base board or another HAT. The connector works pretty well as a "foot" and you can leave the other posts for feet on the other side. I am using a Compute Module 4 with a WaveShare IO baseboard. This has plenty of clearance above the Waveshare heat sink and Compute Module 4. Although I can't close the case, I could file a slot in the cover and use a ribbon cable. My only minor complaint is that the signal designations on the terminal blocks are ordered differently than for the connector pins. I haven't figured out if there is a system to it, but they seem quite random. In some cases the label is the GPIO pin and in some cases it is the usual function, like "TX' or "RX". Probably it wasn't possible (or easy) to make a layout on the terminal blocks to match the connector pin ordering. With a little bit of care in finding the right connection, this provides all the signals. What impressed me was the construction. If this is built by hand, it was done very well. There were no cold solder joints, splashes or burnt lands from using too much heat. It actually looks like it was put through a wave soldering or surface mount soldering machine. The plastic posts could have been metal, but they're good enough being plastic. For the price, this board is a good value. I'm porting an OS to the Compute Module 4, and this board has saved me from hanging LEDs off of my board. It is also nice to see the serial port TX and RX data to at least know of the signals are reversed (one LED on instead of 2). ... show more
Reviewed in the United States on April 20, 2022 by Erik
    • excellent GPIO breakout board
Review Image by rw
Review Image by rw
This is an excellent little GPIO breakout board you can attach to your pi 4. Arrived fast. Packaged okay.. to be honest the packaging was all torn up and I was surprised it wasn't broken in shipping but it worked. It's hard to actually damage an item like this I think unless you overdrive it. I attached it to my pi and an Adafruit 240x240 LCD display then wrote a matrix style screen saver in python and it works flawlessly. I think I read it had led's in the amazon description, but seeing it's leds light up looks great and is actually educational. I bought this one for my pi 4 dev machine and am so impressed I will likely buy a couple more for other pi 4s I use in python automation code development. I couldn't be happier with purchase. Highly recommend if you're into things like this. ... show more
Reviewed in the United States on December 12, 2021 by rw
    • Excellent for Debugging and Clean Wiring – A Must-Have for Pi GPIO Projects
Review Image by Elgin
I used this breakout board in my Raspberry Pi–based oven controller, and it made wiring and debugging way easier. The screw terminals keep connections secure and clean, and the LED indicators on each GPIO pin are incredibly helpful for monitoring pin state at a glance—no more guessing if your code or wiring is working. It plugs directly onto the Pi's GPIO header and includes clear pin labels, so setup was fast and error-free. Perfect for permanent installs or prototyping where reliability and visibility matter. Highly recommend for any Raspberry Pi GPIO project—especially if you’re driving relays, sensors, or building something like a custom control panel. This board makes it way easier to troubleshoot and maintain. ... show more
Reviewed in the United States on May 20, 2025 by Elgin
    • Recommended to all who like to play with Pi GP pins.
5 star product but those included PCB spasers are trash. Rigged my HAT to Pi4 with long M3 screws. I know they should be M2,5 but this way the grip is better. Anyway, breakout board itself is what it needs to be. Recommended to all who like to play with GP pins. If you plan to put this combo in a case, please make sure that you can fit these in before purchase. It's not all about the case measurements but also assembly. ... show more
Reviewed in the United States on July 14, 2026 by Amazon Customer
    • Easy way to test code.
This provides a light for every output, plus access to the output with a screw terminal rather than having to make a header for connection. It is a step closer to installation in the final product without the need for weaker connection means, plug in socket with a wire is not a reliable way to implement a project. With this, you can test outputs by sight, and simulate inputs with simple means. Well worth the money. After the first arrived, I ordered three more. ... show more
Reviewed in the United States on November 27, 2024 by DarkWing
    • Works much better than expected!
I bought this thinking that it might be handy to have around but instead found this breakout board to be so much better than I expected. It is so nice to have screw terminals for all GPIO and power pins. Each row has power and ground plus a row of GPIO connections. Two rows have 5v and two rows have 3v. The only thing I would add would be to put 5v and 3v on each row. The screw terminal blocks are well built and grip the wires firmly. The board fits the Raspberry Pi perfectly and comes with stand offs for mounting the breakout board to the Pi. I highly recommend this product. ... show more
Reviewed in the United States on September 8, 2022 by Bryant
    • Nice for quick prototyping and testing
I recommend this breakout board for the following reasons: * Sturdy construction * Much easier than accessing the GPIO pins directly * It is very informative (and cool) to see activity with the LEDs * Still leaves the GPIO Pins accessible via a pass through * Seems inexpensive for the value
Reviewed in the United States on December 23, 2021 by m
    • Gpio led
I love this thing so cool 😎 Works absolutely perfect I will purchase this again for a second raspberry pie board that I have works fantastic
Reviewed in the United States on October 13, 2024 by David S.

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