I2C Bus Programming On AVR Microcontollers

This video will cover I2C bus programming for the Atmel line of microcontrollers. A PCF8574 I/O expander IC will be controlled by an Arduino Nano module using the I2C bus.
PCF8574 data sheet:
www.ti.com/lit/...
Forth code:
www.dropbox.co...

[@ariyonaty]

Excellent video as always, sir! As a student currently studying now, it sure is nice seeing theory explained and applied in your videos. Keep it up :)

[@lasersbee]

Love your tutorials... Easy to understand and detailed explanations.

[@alijabari8715]

love your videos 💓

[@learningexploration4608]

Good content

[@M0XYM]

Very good indeed. I know you want to keep the video under 10mins but the Forth source code is extremely useful - maybe you could reference the code to a file source somewhere (eg dropbox, google or the like)?

[@0033mer]

Here is a link to I2C.txt via Dropbox. www.dropbox.com/s/rvohyb8gskryug9/I2C.txt?dl=0

[@jangroenman7154]

Beautiful complete explanation, thanks! Only what is the definition of the word "Wait.for.TWINT" Is it testing the TWCR TWINT bit? as i found elsewhere on the internet.

[@0033mer]

Yes .. TWINT is the interrupt flag ( bit 7 of the control register) Execution of a command triggers an interrupt on the microcontroller. During the interrupt the flag is "zero" and changes to "one" when completed. Program flow must wait for TWINT to become true before moving on. I try to keep my videos to a maximum of 10 minutes in length so I ran out of time to go over all the code. (sorry)

[@0033mer]

Here is a link to I2C.txt via Dropbox. www.dropbox.com/s/rvohyb8gskryug9/I2C.txt?dl=0