Really well done tutorial by Adafruit customer Lucky Resistor – check out the full step-by-step build here.
I started the data logger project, because I tried to figure out if I can store my documents down in the root cellar. The humidity in this cellar varies from 75% up to 90% which is way to high for paper documents. So I plan to store the documents in a sealed box. Because I am not sure if the sealing is good enough for the environment down in the cellar, I will first place a “test box” there with the data logger inside.
There are plenty commercial data loggers available to use for this kind of task, but it is much more fun to build a own.
To test all involved components I first created a prototype on a breadboard. Then I created a minimal and simple version without display and just the sensor. The documentation for the minimal and simple version are still available on this site. After all tests were successful I built the final version with a nice case, display, capacitive keypad and wireless charging…
The data logger deluxe ist a humidity and temperature data logger. It is powered by a lithium ion battery which can be recharged wirelessly using a Qi charger. The data from the sensor is stored in a FRAM module. There is a small display and a capacitive touch key pad to control the device.
Featured Adafruit Products!
PowerBoost 500 Charger – Rechargeable 5V Lipo USB Boost @ 500mA+: PowerBoost 500C is the perfect power supply for your portable project! With a built-in battery charger circuit, you’ll be able to keep your project running even while recharging the battery! This little DC/DC boost converter module can be powered by any 3.7V LiIon/LiPoly battery, and convert the battery output to 5.2V DC for running your 5V projects. Read more.
SHARP Memory Display Breakout – 1.3″ 96×96 Silver Monochrome: The 1.3″ SHARP Memory LCD display is a cross between an eInk (e-paper) display and an LCD. It has the ultra-low power usage of eInk and the fast-refresh rates of an LCD. This model has a matt silver background, and pixels show up as little mirrors for a silver-reflective display, a really beautiful and unique look. It does not have a backlight, but it is daylight readable. For dark/night reading you may need to illuminate the LCD area with external LEDs. Read more.