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.
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.
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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.