Tutorial 08 for Arduino: SPI Interfaces

[noccy80]

Eagle CAD is free for non-commercial use but not open source afaik? KiCad is free and open source.

[enticed2zeitgeist]

So in this case the SPI is just converting digital output to analog? It's like fake PWM? or real PWM?

[enticed2zeitgeist]

What does VCC stand for?

[powerwingman]

Is it evilcat or evil cad

[sciguy14]

@powerwingman eagle CAD?

[lazerusmfh]

@sciguy14 Evil cat. Definately Evil Cat.

[Kryoclasm]

Jeremy, I am liking your Arduino tutorials very much, but I must correct you on one point...

The "W" in the digitally controlled variable resistor stands for "WIPER" not washer. Think windshield wiper; that is the physical design of the moving part on the analog pot variable resistor.

Otherwise, keep up the good work.

[msxcytb]

Great video- as always!

Keep good stuff coming:)

[vikasshetty88]

thank you

[0sys0]

really helps a lot with my project....

[allmyenemies]

Hi! Thank you for spending your time for these awesome tutorials!

I see that the three leds have different time in growing and fading light, but in the code are the same numbers of levels... it's my wrong impression? Led 0 is faster than others :))

Anyway good work!

[JerichoKaren]

is that a robot arm that I see on the rightside of your table? do you use your arduino to control that arm?

[hebrewhammer1000]

Really great video thank you!!! I had a question that I hope you could answer.

I am trying to build a usb based data acquisition system that has 32 channel with a minimum resolution of 12 bits and has a sample rate of 100-200hz. I decided to use 4 of the MCP3208 which is a 8-Channel 12-Bit A/D Converters with SPI. The problem is I would not be able to continuously sample all 32 channels. Do you know of a way to buffer the SPI output of the MCP3208 or another way to sample all 32 channels?

[sciguy14]

@hebrewhammer1000 Why can't you now? Is it a hardware limitation? If the SCLK of the SPI bus is sufficiently high, I'd think you can do all the buffering internal to the microcontroller.

[hebrewhammer1000]

@sciguy14 thank you for the reply. i am new to using spi but my understanding is you have to use the chip select to chose what chip i want to sample from? so you would have to cycle between the 4 MCP3208 which would mean i wouldn't be able to continuously sample all 4 MCP3208. is my understanding of spi incorrect?

[hebrewhammer1000]

@sciguy14 what exactly do you mean by "If the SCLK of the SPI bus is sufficiently high"

[sciguy14]

@hebrewhammer1000 IE, if the clock frequency is fast enough.

[sergiogsx79]

amazing work !!! I was having some hard time understanding some aspects of SPI, all of them got solved by watching this video. Really really big thanks for such a proffesional quality videos, hope you continue with them for long. Its really easy learning arduino with your videos.

Proposals for future videos:

- graphics LCD

- GPS module

- GSM module to send sms, receive sms and answer back or do something, upload data via GPRS

- USB data storage

once again, thanks!!

[MrAAK95]

hey Jeremy i can't see the episode 9 on your channel.

[theekshana12]

hello what is the diferance between netduino and arduino

[karandex]

you cold have used one lower value resistor common to all ground.

[karandex]

why you are so good. I am jealous . How old are you. What is your education , and what your projects till now. We like to see them in a video

[nfalas]

Awesome work Jeremy keep up the good work, love all ur videos, good to see someone taking the time to teach this.

[MrAAK95]

very nice series, i am learning from these videos alot. Thankyou! Jeremy.

[thekiller0673]

you say" thanks for watching" i say"thanks for taking the time to plan out this video and posting it for free", i love this videos and the things you do on youtube.

[sciguy14]

@thekiller0673 your welcome!

[raghunitin]

This doesn't deserve a yellow difficulty level. I think this fits in the green. :)

Moreover, The programming part and the circuit are also easy this time.

And hey, I like Eric Cartman too. ;)

[sciguy14]

@raghunitin Maybe not complicated to me or you, but these tutorials are aimed at people who are just getting started with electronics.

[fabse64]

@raghunitin You're funny! I'm having a damn hard time understanding these. I'll have to rewatch most of them a few times.

[francisroan]

how can u see us ???we can only see u!!!!haha

[vmarfus2]

thank you so much im only 12 and trying to learn electronics!

[sciguy14]

@vmarfus2 Yeah! Get started early!

[sigi199191]

finally some complicated circuits !! but next week :\\

btw...nice base tuts :)

[masongalbraith]

i love these videos because there actually long and give me something to do and learn about

[sciguy14]

@masongalbraith Very glad you like them.