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

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!

Nice shield. Excellent value! It is very simple -- has a DS1307 RTC, an SD card reader, and a small vector board area for soldering in custom sensors. RTC does not come connected -- you must connect the SCL and SDA pins then use the library "RTClib" available on github. Recommended not for beginners unless you're willing to learn how to use I2C communications. Not 5 stars because the pins are somewhat flimsy and there was no documentation included though I will likely buy a couple more at this price.

I bought this for the rtc on a shield. Might use sd logging at some point. I don't like that I had to connect sda to a4 and sdl to a5 myself. I used superglue to attach a wires. The whole point of a shield is to get rid of some of the wire mess. In any case works well. The day of the week did not work for me, but I did not need it. I used this to turn an arduino and a doorbell into a kind of grandfather clock.

Received "HiLetgo Mini Logging Recorder Data Logger Module Shield V1.0 For Arduino UNO SD Card" that was non-functional. Solder joints from SD card slot to PCB suffered from both insufficient wetting and insufficient amount of solder. I am returning and will update review should the replacement work. Update: Replacement shield works. Absolutely no documentation provided and board layout is slightly different than the Adafruit documentation they tell you to use.

This shield works well with older Adafruit libraries. Note that the SDA/SCL pins (next to the reset button) are not connected. If you use a board other than R3, you need to connect the A4/A5 pins to proper SDA/SCL pins manually. I would prefer the new Adafruit shield, but this was less than 1/2 price.