Getting Started With STM32 and Nucleo Part 2: How to Use I2C to Read Temperature Sensor TMP102

Let’s take our STM32 to the next level and communicate with a sensor. We’ll use the I2C protocol to send and receive messages with a TI TMP102.

In this video, we’ll show you how to use the STM32CubeIDE to create a new project and write a few simple STM32 HAL commands to transmit messages across the I2C bus. We’ll read temperature data from a TMP102 sensor and then calculate a readable temperature in Celsius from that information. Finally, we’ll use the STM32’s UART peripheral to transmit that temperature data back to our computer to read on a serial console.

The STM32 series is based on the ARM Cortex architectures. Specifically, we’ll be looking at the STM32 Arm Cortex-M microcontrollers. To make life easier, we’ll be using STMicroelectronics’ official Nucleo development boards (the Nucleo-L476RG in particular).

WRITTEN TUTORIAL

ADDITIONAL RESOURCES

[gustavoghedim]

The best explanation I've found so far, one video about SPI and CAN communication would be amazing!

[shambles]

These videos are the gift that keeps giving. I used this very video over a year ago to help me get up to speed and it was invaluable today as well. Thanks Shawn!!

printf and its derivatives are capable of printing floating point numbers by the way, no need to juggle the number and print the integer and fractional parts separately.

[David-ypoz]

Awesome vid, can you make one for SPI as well?

[filmweaver]

Excellent explanation! Even as a mechanical engineer with no previous formal knowledge on this, I am able to understand! Now I understand how "easy" arduino makes all this, for beginners

[kumarghz]

Amazing explanation about I2C. Please make one for SPI

[Hirnlappen]

Incredibly sharp and concise tutorial!

[DownhillAllTheWay]

I'd really like to see your simple, concise explanation for reading and writing to an SD card with SPI. That would also solve other stuff I want to do with SPI.

[jamesdavid]

Bro, these tutorials as a refresher from my final year course has been a life saver! I can't thank you enough!

[electronichome]

Many thanks Shawn!
I'm really motivated to finish this course, but already in this second lesson I'm running into the complexity of STM32 programming. It's not like the standard C to me, especially with those crazy HAL functions. Also, your programs are quite elegant and professional, which means in plain language that they are not friendly for C beginners, or at least not for me. But I don't give up and keep going.

[igabo]

Man your explanations are perfect. It's just the right rythme I need, thank you !

[fernandoi]

I would like to complement this amazing tutorial by pointing out a few issues:
1) the 2s complement comment should state that you are actually extending the 2s complement encoding from 12 bits to 16 bits;
2) the float value is converted to unsigned int in the printf, so negative values will not be displayed correctly.

[nereamonrio]

Are u an unit vector? Because you give my life direction

[ValiRossi]

I just bought 3 STM32 Disco boards from Digikey. These videos are great. Thanks Digikey!

[dnyaneshvarsalve]

Your explanation to every topic is very good and easy to understand.
Thank you

[danndemetre]

Great tutorial, used this in part to setup an ADS1115 connected to a LM60 on the BluePill.
Just one thing though:
sprintf((char*)buf,
"%u.%02u C\r\n",
((unsigned int)temp_c / 100),
((unsigned int)temp_c % 100));
}
This will fix chopping of leading zeros for the decimal value. (ex: 20.09 = 20.09 and not 20.9)

[pseudounknow]

Why the address for reading/writing stay the same ? We should do something like this "TMP102_ADDR | 0x01" in order to add 1 ?

[moinshaikh]

Very very nice explaination dear! You're the Reason I understand the programming of stm for the first time.

[shelbypereira]

these videos are brilliant, so clear, to the point and highlights all the important stuff including error handling... and I love the bow tie!

[damnyutoobe]

Very nice to see digikey getting into the STM32 tutorial game.

[itsme.]

Why my browser insists in showing me subtitle for this video in Korean language???