MakerFocus 4pcs 8-Digit 7 Segment Module MAX7219 8 Bit Digital Segment Tube LED Display Module Supports Cascade Eight Bit Serial 3 IO Ports for Arduino MCU/51/AVR/STM32

A positive if it works, it's cheap, and it works as advertised. Negative Even by the standards of Amazon's maker electronics, the soldering and assembly are poor.

I have tested two out of four so far. I see solder "spilling over" from one of the through-holes in the other that does not operate at all A pin from the hole is soldered to the IC pin. One of the other units I tested works fine, but all four have a white residue on the back of the circuit board, which I presume is Additionally, 3/4 of the units have displays that are crooked, meaning they do not line up nicely. Although their prices are not particularly low, I am not surprised at the quality, given that these are $4. 99 each. Seeing what people can get for 33 cents a unit is what you should convey to others.

Saoirse Shaw

| Sep 12, 2020

Amount of corrosion and poor soldering can be seen on the back of all boards. During the test, one of the displays wasn't aligned properly. Replacing them turned out to be a failure as there were two misaligned displays and they were all corroded as well. Although I have not tested them, I'm not confident about their quality due to a.

Raquel Heath

| Mar 01, 2021

There appears to be some serious issues with these creatures, two of the four died within an hour of each other. In the first case, the right four digits refused to work right away and then failed to work at all. one looked good to me on test, and it worked well for about ten minutes. She died a short time later. It was better that I made my own connectors than soldered
I don't know what advice to offer since all the other items here on Amazon seem the same, so I ordered more products from a different vendor to see if I had.

Sunny Roth

| Sep 13, 2020

In this case I am using this to drive the solid state relay that drives the I've seen people spend a lot more than that on similar solutions. Together I believe they'd be a much more affordable choice. The following is an important note According to the info I found, the output should match the supply voltage, but I don't find that to be the case. A mismatch between the output impedance of the SSR and the device probably contributed to this outcome. The output I had when the contacts were open matched the voltage coming from the supply. In connection with the SSR, the voltage was near 3 volts (which was not quite enough to trigger it to turn It output around 4V (which was sufficient for my needs) when I used a 12V supply. In the case of 0 Control the element output by adjusting duty cycle between 1 and 100% after triggering SSR control. After lowering frequency to 1Hz, trigger SSR control, and change frequency back to 3Hz. I like it a lot!.

Benicio Browning

| Mar 17, 2021

There were a few issues with an order I received. They were replaced by the reseller and the issue was resolved.

Overall, we think these are worth the price.

Gerald Rich

| Feb 16, 2021

As a result, I had to use the wayoda/LedControl Arduino library to control them, which is a bit different than I anticipated. Although they work great, they are not the highest quality.

Lina Vaughn

| Aug 12, 2020

Two of the items were pulled out for a project, one needed repairing, the other needed replacing. It appears one of the solder joints was broken display module, whereas the other has the two display modules tilted. The start didn't go well.

Alexia Gentry

| Nov 30, 2020

This is the 7-point plan On the modules I received, the LEDs on the segment were positioned reasonably well, not perfectly, but good enough. There are no issues with any of the modules. Seller MakerFocus offers this product. It will be in October 2020.

Rayne Moon

| Dec 07, 2020