WWZMDiB 4 Digit 7 Segment Digital Tube LED Display Board for Arduino (5 Pcs)

Nice and bright, but not over-driven, good size and a fantastic price. Only minor issue is that they soldered the four-pin connectors on the wrong side, making removal required if you want to actually mount these to a panel. Be sure to bring your desoldering skills.

It has the 4 pin I2C interface, but the chip has no slave addressing, so you can't put more than one display on an I2C channel. It does have a colon, if you want to display time, but NO DECIMALS. All five of my units came up out of the box, the library works great.

I got a pack of five for just eight dollars, which is a great price. These things can get really bright, so I use them at the minimum brightness. As others have mentioned, there is one flaw: the headers are soldered at an odd 45 degree angle on the face side, so they will most likely require re-soldering if you want to panel mount them.

Displays all worked perfect, my only complaint is the pins are soldered at an angle which can make using the displays a little awkward.

Appearance, size & packaging: All 5 modules are built on a single, separatable PCB. These are delivered in a 3.3 x 4.8in cardboard box. Module pins are not foam protected, but none of mine are damaged. The CL3642AH display is approx. 9/16 x 19/16in (14 x 30mm) and the individual digits are 0.36in height [approx. 3/16 x 3/8in (5 x 9.5mm)]. The CL3642BS display has a colon (":") separator, but no dot separator: don't buy this 1 if your application requires the decimal point. Testing: I was able to display all targeted characters (digits 0-9 plus A-F plus "minus"). Total current draw for the module ranged 4 to 59 mA (lowest to highest brightness, respectively). Details: (a) I used Arduino+A.Orpaz AVR library. (b) One detail tripped me up: make certain to setBrightness before displaying characters, else the display is blank.

I was not clear on what the measurements meant in the product description. These were smaller than what I ultimately needed, but they work well and are easy to use. The 0.36" measurement is the actual height of each digit on the display. I used these with an Arduino and an open-source library with no issue.

Works as expected.

Works like a charm with my Raspberry Pi Zero V1.3 and Pi Zero W 2 boards. All I needed to do was download tm1637.py from Github (I'm using the depklyon version of tm1637, search for it), hook the power (VCC and GND) pins to 3v3 and ground pins (17 and 20 in my case) and the CLK and DIO pins to GPIO pins (GPIO23 (pin 16) and GPIO24 (pin 18)). For the python code add these lines in the appropriate places: import tm1637 #declare variables CLK = 23 DIO = 24 tm = tm1637.TM1637(clk=CLK, dio=DIO) #adjust brightness tm.brightness(0) #then call tm.show(x) to print a string to the 7 segment display tm.show(str(x)) Then let the learning and fun begin!

Needed something cheap to test a concept. Worked so well, I've ordered 5 more.