After fixing the timing problem with the sensor library, I started the data logger and recorded data in 10 seconds intervals until the memory was full. This time the AM2302 (DHT22) sensor was read every time, no cached values were used. It created a really interesting data set you can see in the diagram below (click…
Data Logger Simple – Software Bugfix
After analysing recorded data from the simple version of the data logger, I found a problem I had to fix with a new release v1.1 of the software. If you look at this chart, which is showing data recorded in 30 second intervals, you can clearly see the values do not really change every 30 seconds. The…
Simple Version of the Data Logger Published
I just published the simple version of the data logger hardware and software. The simple version extends storage of the minimal version with external persistent RAM. The additional storage provides space for more records and a higher precision for the records. Temperature and humidity is stored as float and the time as a UNIX timestamp. I…
Long-Term Test Finished
I finished my long-term test of the minimal version of the data logger project after a few days. To simulate the situation for the actual usage, I setup the data logger to record data in 1 hour intervals. The test answered these questions: Does the data logger function properly over several days? How much battery does the…
Data Logger Documentation Online
I just published the minimal version of the data logger project. The minimal version uses the built-in EEPROM of the microcontroller to log sensor data. I decided to create this additional minimal version because it works for very simple cases and does not need any external memory. The data logging mode is controlled using a…
Are My Documents Safe in the Root Cellar at ~80% Humidity?
Update 2015-08-21: Added the wiring diagram. Update 2015-08-24: The documentation for the minimal version is online here. There is a large cellar where I could store unused items and documents, but the catch is the humidity there. It is a root cellar near a small brook and the humidity varies between 75% up to 90%….
Lucky World – A jump’n’run game for MeggyJr RGB
Today I release a full featured jump’n’run game for the MeggyJr RGB platform. It has an intro, a level map with more than 16 levels packed with obstacles and even a end scene. This game uses most of the flash of the ATmega328P and it was an interesting challenge to keep everything as compact as…
Source Code for Xmas Decoration on GitHub
Today I found some time to document the source code for the xmas decoration and push it to a GutHub repository. I added some comments to explain some of the cryptic calculations and added warnings what you should not copy from this code. The link to the repository is: https://github.com/LuckyResistor/XmasLights Have a look in the…
How to Create Color Changing Xmas Decoration
Update: Read the full project description here. The days are getting shorter. You do not have to fear the dark, this is the right time to create a fancy color changing Xmas decoration. This is a very simple project and is quickly done. Required Parts “Silver” laminated paper and/or half transparent paper. NeoPixels from Adafruit…
All Meggy Jr RGB Colors
I created a complete color table with the impression of all possible 4096 Meggy Jr RGB colors. The green LED is much brighter than the other two LEDs, the first tables used blue as base which does not make much sense. So I created a second set of tables which use the bright green as…