For my ongoing thermostat project I require some sort of temperature and humidity sensor. Because I'm fairly new to all this I decided to get a 2 in 1 sensor from Robotshop called the SHT15. I went with the SHT15 because it had both a temperature and humidity sensor and uses a "digital 2-wire" interface. When I first purchased it I didn't realize that "digital 2-wire" didn't mean I2C, but that's another story.
In order to get the sensor to communicate with the Arduino I needed to write some custom code that manipulates the data and clock lines by pulling them high and low at the correct times. I haven't had any experience doing this before so it was a learning experience for me.
Connecting the SHT15 to the Arduino is pretty simple. The data and sck lines each goto a digital input/output on the Arduino and the VCC goes to +5V. Pretty simple. Here is a picture of my breadboard.
As you can see I had to solder on some breadboard wires onto th…
It's been a while since I've made a post so I have decided that it was about time I did. This time I'll be talking about my Haunted House I made.
I started with the idea to take a Halloween decoration (small haunted house) and add some LEDs to it and make them blink. What I ended up with was a haunted house with 6 LEDs in it all controlled by MIDI. I used an Arduino to receive MIDI signals from my computer and turn on/off LED lights based on those signals.
Check out the video...
The "MIDI to Arduino Breakout Board" as I call it in the video I designed myself. I used various resources on MIDI around the web and came up with this schematic.
Digikey Part list:
2 x DIN5 - CP-2350-ND
2 x 6N138 - 516-1600-5-ND
1 x diode - 1N914B-ND
2 x 220 ohm resistor
1 x 270 ohm resistor
As you can see it isn't very complicated. The hardest part was finding in DIN5 part numbers at Digikey. The code on the other hand was a bit more complicated. The trick was to decode the …
I have finally received my Arduino and have been able to write a few simple programs for it. For my thermostat program I am interested in being able to read several analog sensors (temperature and humidity). I also need to be able to poll specific sensor values from the computer using the serial interface so I can log their values in 5 minute intervals. I don't have all the electronic components yet to build my thermostat so I wanted to write up some test sketches. I based my sketches on a todbot blog entry that I found very useful.
I was originally going to use the C code that todbot wrote to test communication with the Arduino but I soon realized the limitations. What I ended up doing is using "screen" to open a terminal connection to the serial port so I could send and receive data to/from the Arduino. In the future I will have to write a daemon that will run on my linux box that will constantly poll the Arduino for data but thats another story. For now screen …