HiLetgo Data Logger Module Logging Shield Data Recorder Shield for Arduino UNO w/SD Card

This device worked with various good quality generic and name-brand SD cards, meaning it appears to be a good value. Some off-brand and no-name cards didn't read reliably.The real-time clock is a nice addition for logging. The longevity and robustness of the board may be another issue, depending on the environment it is used in.Negative: The board extension pins are very thin and easily bent.

Problematic. Not good in practice. I’m not saying it’s poor quality, but it ain’t great either…

This HiLetgo module is an inexpensive option for logging data on UNOs and compatibles. It requires a CR1220 coin cell battery, not included, to store date and time when not under power. The real time clock (RTC) requires a software library, but these libraries are widely available online and can be installed from any recent version of the Arduino Integrated Development Environment (IDE). The software library for the SD card is part of an IDE installation.There might be concerns about quality control at this low price, but I have used many of these modules without problems. The RTC will gain or lose time slowly over weeks or months (depending on temperature), but this is a property of the clock oscillator and not this particular device.In conclusion... highly recommended if you need data logging with UNOs!

This shield came on time and was exactly as described.This is an R3 version shield, but since it doesn't have an ICSP jack, it won't work interchangeably with the MEGA 2560 R3, without modifying things. Also, this card uses Pin 10 for SD, not the default pin 4 that the Arduino SD library defaults too. Once that's changed, the SD card functions with the library.A minus: because this version of the shield does not have an ICSP jack and pins incorporated, it will be hard to use it on the Mega 2560. They are other shields that do, but none incorporate the RTC, that I am aware of. I realize this is exactly what the open-source has, so I don't fault the shield manufacturers.A plus is the clock. It works well. The SD library doesn't support writing a date (from the RTC) automatically. You need to add a clock call-back function to the loop(), and associate it correctly, during setup. Once that's done, it works very well.Another plus is that it is R3 compatible, so it includes the SDA and SCL pins. They are also broken out so they are easy to use. I find it a useful shield and have incorporated it into an automatic SD temperature logging sensor project. It functions very well and with the clock helped me to reduce the number of shields/additional components.I would use it again, assuming it will be used on the Arduino UNO R3.Note: To repeat, I don't blame the manufacture for the negative things, this is exactly what the open-source specified and they have followed it.

This is not the Adafruit brand unit, it is a HiLetgo copy. It does not perfectly match the documentation linked in the product description, but seems to function just fine! Well worth the price!Mine arrived with stacking headers pre-installed for all but the 2x3 headers for the ICSP pins (and no spare headers were supplied). It mounted right on my Arduino UNO-compatible board without any issue at all. With a CR1220 battery installed, a FAT32 formatted SD in place and the correct software libraries (SD.h and RTClib.h) included in the software sketch, it works exactly as expected! For the Real Time Clock, it uses the older DS1307 - take note.Overall, it's not the latest version (which doesn't seem to be available even from Adafruit), but it works, and is well worth the cheap price! I bought two, and might end up with more soon.Disclaimer: I am an enthusiastic beginner hobbyist with Arduino stuff. Any errors in this review are purely the result of innocent ignorance and I welcome helpful educational feedback! Rated with 4 stars only because the documentation requires some interpretation.