Sensirion SHT11 Temperature and Humidity Sensor on a MikroElektronika Click Board

Posted on April 6, 2015 by Erich Styger

In one of my earlier posts (“Using the DHT11/DHT22 Temperature/Humidity Sensor with a FRDM Board“) I’m using the DHT11/DHT22 temperature/humidity sensors with the FRDM-KL25Z board. These sensors are very inexpensive, but have limited measurement range and accuracy. As pointed out by a reader of that article, Sensirion (a Swiss company :-)) has good sensors too, and I decided I would like to try the SHT11 sensor:

0-100% Relative Humidity
+/- 3% Relative Humidity accuracy
-40 – +125°C
2.4 – 5.5V supply voltage

SHT11 Sensor

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Solving the 8192 Character Command Line Limit on Windows

Posted on March 29, 2015 by Erich Styger

There is a really annoying issue with using command line tools on Windows: the maximum length of the command line passed to cmd.exe is 8192 characters (see http://blogs.msdn.com/b/oldnewthing/archive/2003/12/10/56028.aspx). So you think this is not a problem for you, as you would not pass such a long command line to cmd.exe (the DOS shell under Windows)? Well, if you are using Eclipse (as I do) which generates make files (which is the normal way), then the cmd.exe very likely is involved to call the compiler/linker/etc, indirectly with the usage of make.exe. Compiling files is usually not a problem as it does not hit that 8192 limit. However, it is likely that link phase will end up with an error:

Error in the Problems View

If you have such a problem, there is a solution ….

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Using the DHT11/DHT22 Temperature/Humidity Sensor with a FRDM Board

Posted on March 27, 2015 by Erich Styger

For a home automation project I need to know the room temperature and humidity percentage of the room air. Adafruit has an inexpensive DHT11 sensor from http://www.aosong.com which I decided to use for that project.

Test Setup for DHT11 Sensor

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McuOnEclipse Components: 03-Feb-2015 Release

Posted on February 3, 2015 by Erich Styger

It has been a while since the last version, but finally there is a new release available on SourceForge, with the following highlights:

FreeRTOS V8.2.0 with task notification
New VS1053 component to play MP3 and MIDI data/files
Shell with command history support
Percepio Trace V2.7.0 for FreeRTOS

Components Release

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eWheel Velo Bling-Bling Freescale Project

Posted on January 11, 2015 by Erich Styger

So here is a really, really cool project: eWheel Velo Bling-Bling:

Velo Bling-Bling with km/h (Source: Peter Schmid)

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Updated Percepio Tracealyzer and Trace Library to Version V2.7.0

Posted on January 5, 2015 by Erich Styger

Percepio has recently released the v2.7 version of Tracealyzer. This is a major upgrade from the v2.6 version which I have used so far: time to upgrade my Trace component for FreeRTOS to the latest and greatest v2.7!

FreeRTOS+Trace View (V2.7)

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Shell Component with History Function

Posted on January 5, 2015 by Erich Styger

Thanks to the contribution from [francescoaru], the Shell component has now a history function:

Shell with History

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Snow Plowing (Darth Vader) Sumo Bot

Posted on December 30, 2014 by Erich Styger

Finally, winter with lots of snow arrived in Switzerland. Getting up at 5am this morning to free up my front yard from the 25 cm snow which came down overnight, so I can drive my wife to work. She does not like driving in snow conditions, but it is fun for me :-). But lots of snow, I thought I could use a little helper bot:

Snow Plowing Sumo Bot

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McuOnEclipse Components: 27-Dec-2014 Release

Posted on December 30, 2014 by Erich Styger

This post is overdue, as it is about the McuOnEclipse components which have been released already a few days ago. The highlights are (beside smaller updates and bug fixes):

Nordic Semiconductor nRF24L01+ component extended for shared SPI bus usage
SD_Card component can use AsynchroSerial component for Kinetis
FatFS has added v0.10c patches
FSL_USB_Stack: Host support for Kinetis K20D72 and support for FRDM-K22F (K22FN512)
FreeRTOS has added Timer API support
SourceForge 2014-12-27 Release