Hans de Bruin: It didn't work on my setup. The reason was that for some reason nothing
prints to serial when I put it in void setup.
When I move the Write.requestFrom to void loop it works fine.
I haven't figured out yet why this is...
Vajira Lasantha: Thank you for the video. I'm gonna work on a project where an Attiny85
should send data to an Atmega328 via serial connection. Is it possible to
use I2C for this? Thanks again.
PJ Jones: Hi Again,
Can you do a tutorial the same as this one but using a raspberry pi as
master instead of the arduino. Can you use python please.
Or is this too much to ask of you. I only ask as there is no one else that
has done this.
Thanks ever so much - pj
bas k: I did exactly the same with my mega and uno, it does not work. The led is
not turning on ( i tested it, it is not the led)
Christo Pretorius: Thanks
PJ Jones: Fantastic tutorial - thank you very much - very understandable.
If you wanted to add yet another arduino, am I right in thinking that you
would wire an additional arduino to the master as you have done the
leonardo and in the software just use another ID instead of 5?
Daniel Wekesa: This stuff doesn't work....
John Spuzzum: This is a great tutorial.. I just wish I knew coding a bit better. I'm
currently trying to add a 2nd Atmega328 to the DIY Arduino Uno that I made
to run high powered LEDs, but my script fades up and down like sunrise &
sunset, with each string's on/off times 15 minutes less than each other,
all configured by the user seting the main on/off times through the
controller, with all datas stored in the EEPROM. Problem is.. the 328 only
has 6 pwm pins, and I kinda need more. That's where the $4 Atmega328 chip
as a slave sounds better than a $60 Arduino Mega.
I understand the coding enough to where I can just put the same LED
commands from the master to the slave.. but it's the determining the
LightsOn/LightsOff times from the master to the slave I'm confused about. I
can set an "if" staement that can start LightsOn time, but it can't perform
it's fade to sunset countdown if it doesn't know when sunset is.. which is
held in the master's EEPROM. And I don't want to limit the device to a
certain daylength.. otherwise it's just as easy as to do the math in the
Is there a way where the master can talk with the slave's EEPROM? It would
be nice if they could be combined as one. :P
Fabio Ruiz: very useful, thank you!
Eric Mooney: Great tutorial! Thanks. However, mine doesn't work per your video. I have a
Yun as my master and a Mega as my slave. You have the Wire.read() while
loop in the master setup method and not in the loop method. When I look at
the slaveSender example, the while loop is in the loop() method. And I can
get that to work.
Could it be a timing issue that I'm experiencing? Like you said, I've tried
putting delay's in the code but to no avail.
Thanks again for the video!
Roy Gevers: Thanks for this clear tutorial. You've really helped me a lot!
YTPmaster: Im 17...
robin vermillion: it tried this with 2 nanos . i had pin13 blink on the master when it is not
transmitting. the moment i send a H it quits blinking. it never gets out
of the transmit section. of the code. the previous video it worked were i
would send a variable from a pot to the nano (pwm_led). then send the data
back to the uno(lcd.) And display the info. the communication worked on
that on but the nano pwm_led didnt work. it must have something to do with
the nano itself..
Basim Hafidh: It is very interesting video. I would appreciate if you can do video on
I2C communication between Arduino (master) and Picaxe(slave).
Henrik Wille: is it possible to communicate just by using the normal pins?
example:connect arduino1 and 2 with a cable from "pin 4" on Arduino 1, to
"pin 4" on Arduino 2? arduino 1, digitalWrites(pin4,HIGH), while arduino 2,
digitalRead(pin 4)? and just checking if its high?
snaprollinpitts: cool, I didn't know you could do that
YTPmaster: I love windows 7, 8 sucks...
humanHardDrive: I'm also quite interested to hear more about you're experiment.
humanHardDrive: Did you include the wire library.
humanHardDrive: You should watch my video talking about the I2C EEPROM, the first of the
two I2C videos. That covers asking the slave device for data, and waiting
for all the data to be received. In this way, you don't need to specify how
much data you want.
hgdingman: these tutorials are terrific! Is there any reason that you don't use the
power bus rails (+/-) on the breadboard? Back in TTL days I always brought
VCC and VSS to the rails, then it was handy for tying pullup resistors and
bypass capacitors when needed, as well as extra-short jumpers to power
devices on the breadboard
Brian Keyser: Thanks for this great video! How would you recommend connecting multiple
Arduino's that each have their own power source? ie) wall warts If you tie
the 5V lines like in the video, wouldn't this put all the voltage
regulators of the Arduino's in parallel? -I've read that having regulators
in parallel is not recommended because one of them will end up doing all
the 'work' since they are never perfectly identical, but I've never tried
it. Any suggestions?
humanHardDrive: Each Arduino would need it's own power supply, not power each subsequent
Arduino off only one.I tie the power lines together to ensure the logic
Binam Ghimire: they are connected to master arduino
iSolarSunrise: You just get that component datasheet, do what it tells you to do, and you
can communicate it. If you read the datasheet but can't understand it, you
can get some help on the net. Can you share the IMU sensor? I can also help
you if you want.
qazwsx12: great tutorial.... it's pronounced "eye SQUARED see" though, NOT "eye 2
sea". this because it's the inter integrated circuit (iic or i2c) bus.
humanHardDrive: I can definitely do that.
Pulsed Neutrino: when it wakes I set it to do lots of stuff including serial print adc data
and such so its clear when it does not wake. hmm i'm going to try to flash
some different bootloaders on see if perhaps they work.
Austin Wilkins: Awesome tutorial man! Thanks! Could you also do one with communication over
I2C with a sensor?
joblessalex: Please make a tutorial for the multiple click speeds
Tom Schneider: Hey cool vid! Here's a tip: I2C is spelled "I squared c" because it's
normally written i²c
Binam Ghimire: sketch_mar10c:3: error: 'Wire' was not declared in this scope
sketch_mar10c.cpp: In function 'void loop()': what kind of error is this?
pongAssist: Sorry, I'll clarify as soon as my code calls a wire.write function the
entire system hangs. I even loose the debugging code in my serial window.
However, no actual error is reported by arduino.
humanHardDrive: To my knowledge the only way to get that to work is using an Ethernet
helpmode: If they are not on the i2c bus I would just send to bytes per sensor to the
slave device. 10 bytes in total. The first byte indicates the sensor
(number 1 - 5) fallowed by its value. This should work, or am I wrong?
humanHardDrive: Are the ping sensors on the I2C bus, or just connected to one of the
humanHardDrive: How do you mean? Ethernet communication is digital, not analog.
carbine000: Love the "low disk space" notification. Great video. Thank you!
Hisham Gadollo: Awesome tutorial Dude :) with a sexy voice, of course I don't know why are
the number of viewers is still low, though this tutorial is awesome !!! But
I hope you could post any tutorial about how to use Ethernet shield for
reading analog signal for example
Binam Ghimire: thanks for the support but i pull it off. the error was quite weird
though..i erased the whole thing and wrote it again..it worked! Keep
posting new videos !!.nice work!!!!
Martin Spurgin: The final build is to be mounted into a small box 5x5x5 cm for attachment
to the stratospheric riser. So its looking like arduino nanos or another of
the of the smaller ones may work nicely, minimal effort. The first
prototype was with some ancient micro controller I found in a draw at the
research institute. but I had to program those from the ground up with C++.
The arduino system seems slightly more accessible.
Hisham Gadollo: I mean, reading the analog signal from LM35DZ for example by using the
arduino And then printing its on a web page
Enrique Gómez: How many meters of wire can I put between the Arduinos.
humanHardDrive: I tie the two together so that a slight change in the voltage of one, will
be balanced out by the other's remaining constant. Thus ensuring safe
humanHardDrive: Any sensor you have in mind?
Buzz Werd: If the master is connected to the PC then you can use a Processing sketch
and the Processing UDP library on the PC to be your Ethernet device that
talks to your Arduino via Serial. No I haven't done this, just made sure
it's there. The Processing IDE for your PC is free. Arduino is the Wiring
side. They work as a pair by design. search processing -- web addresses not
allowed on YT Smart thing to do is join the forums what you use. The
Arduino forum is very friendly and usually helpful.
Buzz Werd: I will stick with XP. I can have 2+ IDE windows with monitors open, both
Arduinos plugged in at the same time and download sketches to both at the
same time, I've done it many times. Perhaps the secret is to set up each
IDE window with a serial port and board type right from the start. But
still I can't get SoftwareSerial on UNOs to reliably talk faster than 57600
baud. I2C might be faster for 2 wire and give me multi-device bus
capability? So far for speed/device compatibility I've used SPI.
Pulsed Neutrino: do you perhaps know please why when I use 5v on my uno it allows wake from
sleep using half supply voltage and above on pin 2 but when I run it off a
3.7v lion even full battery volts cannot wake it? kind thanks
pongAssist: Thanks very much for the tutorial. It helped me to configure an i2c system
with one master and two slaves, but for reasons I don't understand, the
system is freezing each time I attempt to run it. A description of my
problem, a schematic, and my code can be found by searching "Arduino I²C
freezes after startup" on Stack Overflow. I'm sorry, I'd give a direct
link, but youtube won't allow me to. Do you have any idea what might be
wrong with my i2c setup? --Thanks