Tutorial 07 for Arduino: I2C Communication and Processing

[2BeN3]

How do you know that the temperature address id is 72? I am using an Arduino Stalker which has an onboard temperature sensor and was wondering how to find out what id it has on the I2C bus. The same goes for any other i2c devices...how do you find out their corresponding ID's. Hopefully someone out there can help!

Thanks a lot!!

Ben

[shearbanding]

You should try Firmata, it's seriously a lot easier for communicating between Arduino and Processing.

[enticed2zeitgeist]

Is it really pronounced Ardoo wee no? I've always said it was Ardweeno. Not that it matters really, just curious if there was an official way to say it.

[deebsboy]

I am truly greatful for all the tutorials you put up here. Very clear and concise. Thanks for all of your hard work!

[Rannyfash]

i have 54 slaves ;)

[gergsymons]

Hey Jeremy,

Thanks a lot for all of your videos, they have been really helpful! I have 2 questions:

1. Can I use this method of communication to talk to another Arduino?

2. If so, how do I attain the address of the Arduino I would like to use as the slave?

Thanks again for all your tutorials man!

Cheers,

Greg

[sciguy14]

@gergsymons I believe this is possible, but I've never done it.

[powerwingman]

what if i want prossesing to communicate with the arduino

[obeliskdix]

Jeremy could you make a video like this but the vid you'll be making is how to display the temperature on android tablet screen or any android phone. . . If there are others here who knows how to do it please share it, show it or send me infos about it to my mail sadex_17@yahoo.com. Thanks to all. . .

[WarSpigotProductions]

@obeliskdix if you want to go all out, you could get an ethernet shield for the arduino and make it put the value on a website, then write an app to fetch that data. App could be written in Google App Inventor(although they might have already shut it down by the time you read this)

[tpageIII]

This is one of the greatest instructional videos I have ever seen. Great job. Definitely a new fan and subscriber.

[hugosdominoes]

What kind of input will 16 byte digital I2C communicated 3 axis gyro give?

And how could I show the input as degrees?

[cloudstrife0919]

@sciguy14 hi can you pls. teach us how to display temperature using an lcd instead of displaying it in a computer. . . thank you for all the tutorials :))

[sciguy14]

@cloudstrife0919 I do this in my LCD tutorial.

[tamyboy1]

awesome bro!!!

[EpicTronics]

@sciguy14 Did you have to click on the serial monitor first to cause the arduino to go into the 'transmit state' ? If I unplugged my arduino, I would have to keep on opening the serial monitor otherwise the degree and Fahrenheit would not show up in processing.

[Pirochiro]

Anyone else getting constant pausing and buffering even though the video's already fully loaded? :/

[rponmalai]

great video

arduino is prenounced r-dwe-no

[1ofakindwork]

Thanks Sciguy,

I'm having a hard time finding the information to see if the arduino will work for my idea. Can you point me in the direction of some solid information on the RTC and it's applications. I haven't seen anyone use the RTC for controlling multiple dc motor at set time and intervals.

I want to run a dc motor for 1 min at 7am, then run it at 9pm with the polarity reversed.

I'm also unsure of how much multitasking the arduino can handle.

1 RTC

1 dc mortor

2 servos

1 sound board

[sciguy14]

@1ofakindwork You'll need either an extrnal RTC chip, or you'll need to have the arduino hooked up to the web to use accurate timing like that.

[1ofakindwork]

Can I use a real time clock to send signals to control my dc motors and servos. Thanks

[sciguy14]

@1ofakindwork You mean to control them at certain intervals?  Sure.

[rodhoffman]

thx for the tips! I couldn't get my code to work until i saw this vid.. pull up resistors! Of course! :)

[sciguy14]

@rodhoffman Those pull-up resistors will get you every time... ;)

[CIPHERJAY]

I couldnt find 72 on the data sheet and i think this is the reason why i cannot get it to work..

[sciguy14]

@CIPHERJAY Look at the codes table on page 13 for TO-220 package. 1001000 =72 for the A0 device. Is yours A0? It might be something else, in which case you should use that address.

[CIPHERJAY]

@sciguy14 Thanks! I realised that my connection to pins 2 and 4 had to go to 20 and 21 because i have an arduino Mega :)

[CanFire9]

Great video SciGuy ! You really go the extra mile by making everything available on your website including URL's on where to find the parts.

[sciguy14]

@CanFire9 I'm happy to see people noticing all the supporting material that I produce for these videos! Schematics and Full Source Code too!

[eddiea6987]

why does everything look the same? this i2c thing looks identical to a transistor/mosfet, aside form the number of pins

[jeffhuys]

Where can I get these kinds of IC's? Live in the Netherlands.

[sciguy14]

@jeffhuys Most companies will ship internationally.

[foxxtrotalpha]

where did you get the ID= 72? I couldnt find it on the datasheet

[CanFire9]

@foxxtrotalpha Section 3.1.2 of the datasheet states that the default address is 1001101 (binary) which is 77 in decimal. There are 7 other slave addresses available and it looks as though the one sciguy ended up with has an address of 72.

Unfortunately the datasheet also shows that the TC74 Thermal Sensors have a variance of +/- 2 degrees C which makes them pretty much useless for anything other than checking to see if your Arduino caught fire.

[4hbrainboy]

You should make it so when the room gets warmer the window starts to turn red and when it gets colder it starts turning blue

[kildas]

Whats the site you talking about procesing kom?

[sciguy14]

@kildas processing "dot" org

[fuelban]

I got my local library to buy in the book ( getting started with Arduino) By O'Reilly, really interesting book, Handy too for numb nuts like myself....LOL....

Thom.

[sciguy14]

@fuelban I love O'Reilly books

[fuelban]

@sciguy14 Yes its very interesting, Just to say, i enjoy your videos guy, very to the point, and just enough to understand in each one "without loosing the message" , for a newbie like me that is !!, such presentations are a rare quality LOL, keep trucking, I'm looking forward to more. Thom.

[sciguy14]

@fuelban Glad you're liking them!

[100PercentGreen]

Good vid!

[shebotnov]

Why not just send only Celsius value as integer and do all the calculation in the display program ? It would be so much easier to only fetch 1 int and not the whole string of chars

[sciguy14]

@shebotnov That works fine too. There are always multiple ways to do things like this.

[shebotnov]

omg I was starting to learn about I2C looking for tutorials and you just made one!

Even though Iam subscribed to you I didn't get any email notification. Thx for your effort!

[jmettam]

You are awesome SiGuy.

Could you do a tutorial on how to hook the Arduino up with a bluetooth.

I been loving playing with the Arduino but getting it to TX RX with a Bluetooth has made me hit a road block. Maybe I have a faulty bluetooth module, I don't know but its been driving me nuts.

[sciguy14]

@jmettam I'll put it on my list, but it could be a while.

[manutube8080]

why register 0 and only one byte of information.

[sciguy14]

@manutube8080 It is specified in the device datasheet.

[manutube8080]

why register 0

[TheMrgeekmania]

Would really appreciate more videos on processing. For example a program that has a button which when clicks turns on an led.

[sciguy14]

@TheMrgeekmania I may get more into processing in a future video, but not right now. They have lots of great tutorials like that on the processing website.

[raghunitin]

Another concept learned... Thanks to Jeremy Blum........

That suits the proverb, "When the going gets tough, the tough gets going".

Are we gonna have processing on every tutorial from now?????

:-/

[sciguy14]

@raghunitin Nope, it was just these two. It's by far the fastest way to show everybody how serial comm can be used in ways other than a simple terminal window.

[cmdstraker]

Great Video, as always. Preset Ids however sounds like trouble once you have more than one of these sensors on the bus. Are there multiple I2C capable ports?

[sciguy14]

@cmdstraker yes and no, the library is only designed to work with A4 and A5, but you could manually reproduce much of the functionality manually on other ports.  Next week, we'll use SPI which eliminates the ID issue.

[jakebrickhouse]

Really enjoy the arduino tutorials.... keep them coming!

[whisk0r]

The Geek Group might be using vertical pillars outfitted with these i2c temp sensors through out their new facility to allow them to plot out a 3d temperature map of the whole building. The map could be used to optimize the heating and cooling system.

[sciguy14]

@whisk0r sounds like a pretty cool idea.

[manutube8080]

FIRST