HiLetgo 3pcs Pro Mini ATmega328P 3.3V 8M Module Board with Crystal Oscillator Compatible Arduino Pro Mini Replace ATmega128

There are a lot of dev boards around these days, but not everything needs an ESP32. Sometimes the job doesn't call for wifi or bluetooth or tons of processing power and speed. I got these to replace a project that originally had an ATmega128-based 3v processor in it. These are pretty much interchangeable. Good price, so it's one for the project, and two to toss in the dev board box for future projects or replacements. The one I used sits proudly watching over a motorized gate on a farm out in the country in a controller project that marries solar panels with an opener made for mains AC. Thanks for your service, little dude.

They work exactly as described and at a great price.

I wish I had taking the time to read the reviews before I bought these boards. Very very poorly made, they even typos in the silk screen pin labels. Like many others have complained about I was unable to upload to them even after burning a new bootloader. After some investigation I found that they had the wrong crystal installed. The 3v3 8Mhz board had a 16Mhz crystal installed. The ATMega328p does not run reliably at 16Mhz with a 3v3 vcc. I ordered boards without USB converters because I had a limited power budget. I am running off of batteries so I really didn't need the regulator. I removed it and flashed the 5v 16Mhz bootloader and then enabled a clock divider in my project code. I can use them now, but I'll never buy form this vendor again!

Liked - works reliably, takes a lot of abuse and still keeps on ticking Dislikes - Not an issue with this specific supplier, but across multiple suppliers the header for the serial link is not consistent. Some suppliers the ground pins are on the right and other suppliers the ground pins are on the left side.

I am amending a 1 star review. If you follow some tutorials using Pro Mini boards online, using an FTDI USB breakout board, you're going to either run into sync errors, or access denied errors, in ardunio IDE. Make certain that your connection from the FTDI to this Pro Mini on the DTR pins is included. A lot of tutorials seem to not do this. I guess the official boards didn't require it.

Always get what pay for. Good products, good price, good availability.

Works great if you actually know what you're doing. These are rated at 3.3V so if you want magic smoke genies then just apply 5 volts.

I have purchased other HiLetgo products and they have always worked well for me. So, unfortunately I did not read the reviews. In this case I was looking to buy a Arduino Pro Mini compatible board. The HiLetgo part advertised that it came with the bootloader installed, so, I should have been able to program it just like the other Pro Minis I have been using for my development. No such luck. I tried both the Arduino IDE and Sloeber Eclipse. Having spent over an hour trying to get these to work, I'm sending them back. While I see that others have been able to get them to eventually work, these devices do not function as advertised. Although they seem a great value, if I can buy a plug & play device, then the time saved is more valuable.

Got these to use USB host boards that were designed to go on them. The supplied faulty USB host boards didn't work at all but these little Pro Mini boards are actually pretty good. All the power of an Arduino UNO (with 2 more analog pins) in a tiny package without the space wasting programming circuitry permanently built in. I recommend getting some for the box. I won't even be bothering with Arduino NANO boards anymore. These are smaller and delivered in very reasonable time.

Habe vor einiger Zeit 2×3 Stück dieser Module gekauft. Die Rückgabefrist endete im April. Jetzt, wo ich die Teile nutzen will stelle ich fest, dass es nicht möglich ist ein Programm über Rx/Tx auf das Modul zu bringen. Nach langem probieren habe ich über ISP ein Programm draufgebraucht. Ein einfaches Blinkprogramm, das aber statt im 5s Rythmus im 2,5s Rythmus arbeitet. Also hat das Modul, statt 8MHz 16MHz. Die Spannung stimmt mit 3,3V, was eigentlich nicht spezifiziert ist. Ich kann die Teile also nicht gebrauchen. Einen Kontakt läßt sich über Amazon aber nach Ablauf der Rückgabefrist nicht mehr herstellen. Eigentlich gilt in Deutschland 2 Jahre Garantie. Und nun? Bleibe ich auf dem Schaden sitzen?