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I finally got my arduino nano v3.0 ... I'm having some problems getting it to work. I will bring it to the meetup. Currently it is loaded with a LED blinking example.....
0 · September 5, 2013
I thought of an interesting challenge for our next meetup.... Try to make the most realistic looking flickering candle flame with an LED and a micro controller.... You've probably seen them at restaurants.
0 · August 9, 2013
did someone say "random()" ?
0 · August 10, 2013
is a candle's flame actually random with the flickering? hmmmm.... I bet it's one of those things that can be better modelled with some weird math, like fractals or something
0 · September 4, 2013
Oh come on, Saturday morning. There's a soccer game every Saturday morning!
Also, lets try to focus a little on sensors so that we can interact with the real world... a while ago my friend showed me a mass air flow sensor for his car and the design popped out at me... all it was is a light bulb filament without the glass surrounding. A current ran through the filament and when wind blew on it, it cooled down and the current flow increased. All you had to do was measure current. With Arduino's MAP function this should be easy to do. I learned about the map function from Duncan and that pulled me away from PIC to Arduinos....
Sensors I like to use are... photoresistors, photodiodes, hall effect sensors for magnets. Esplora has temp sensor so I'll probably start fooling around with that
esplora also has a 3-axis accelerometer
1 · August 11, 2013
you can use a thermistor in series with a resistor and measure the voltage between. Then you can use the map function to rescale it to a temperature value
0 · August 11, 2013
There are also chips that output the temperature directly on a two-wire interface. I think Dallas semiconductor makes 'em. I wonder if that is what the Esplora uses? I'll have to check the schematic.
0 · August 12, 2013
Nope. Looks like they use a temp to voltage chip and then read as an analog voltage and calculate temp in software library. Chip is TMP36. see page at www.ladyada.net/learn/sensors/tmp36.html for use of the chip with the Arduino.
If I do a voltage divider with a thermister.. would it be linear?
Anyone want to watch movies about robots?
Hey, I just received my new Arduino Esplora. I could not resist after seeing your demo Duncan. Hope to have something to show by the next meeting. Duncan, any ideas?
1 · August 10, 2013
congratulations!. Here are a few things to try once you have gone through the examples. They shouldn't need any extra components. From easiest to hardest.... some might even be examples for the standard arduino
-connect the light meter to the sound generator so that the level of light changes the pitch of the tone.
-have the program wait until a button is pushed. when the button is pushed have the monitor indicate the button pushed and have a tone sound while the button is down
-do a pause without using the delay() function. during the pause have the monitor display the milliseconds since the pause started
-try a simple interrupt routine which toggles the state of the red led while you are in a loop which is displaying the time in milliseconds during a pause ( the previous exercise)
-learn to use the LCD connector for other purposes. Use this link to understand which digital lines go to which connections http://21stdigitalhom... and flash an led on line d14 at 1 hz (this requires an led and a connection to ground)
Great ideas, only I think I will have to return the Esplora. Apparently the RGB Led is not working. It only shows red no matter what RGB is sent. I guess that's what I get for a bargain on Ebay.
I would use a nano its in a dip package
I just ordered an Arduino Nano... hope to get it soon
from China? amazing how fast it will get here.
It might come after our meetup
Are there any competitions we can sign up for? I remember my second year of college my friend and i joined the micromouse competition. It was a lot of fun, id like to do it again.
The trinity college fire fighting/robo waiter contest in April is a possibility. It's in Hartford CT in April
I will be talking about the Arduino in two sections. The first section is targeted at beginners and will be a survey of the Arduino family of boards and chips. The second section will be at an intermediate level and will cover interrupts. Examples will be used from the area of robotics.
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