NetBurner Community Forum

Hi everyone,

I'm working on my MODM7AE70 I want to use I2C to implement a temperature and humidity sensor(Adafruit_AM2320), But I am very new to using I2C, I looked at the Netburner examples to better understand the use of I2C, but I only got confused, has someone implemented this or has experience with the use of I2C? or have you implemented the sensor? I would greatly appreciate your help or any example you can provide.

kind regards
Fredy

Sensor Image

Hi Fredy,

If you're looking to get more information on the basics of I2C, I'd suggest taking a look at an article that we have on the site. It should give you a pretty good rundown on how the protocol behaves in general. There's also additional resources listed there that can get you started if you want to dig in a bit deeper. If you start trying to use the examples and run into any issues, please don't hesitate to let us know. =)

https://www.netburner.com/learn/get-on-the-i2c-bus/

Kind Regards,
Jon

Hi Jon,
Thanks a lot for your help, I'll look the article which you say because I don't really understand the use of I2C.
Thanks again.
Fredy

Jon wrote: ↑Mon Feb 01, 2021 12:05 pm Hi Fredy,

If you're looking to get more information on the basics of I2C, I'd suggest taking a look at an article that we have on the site. It should give you a pretty good rundown on how the protocol behaves in general. There's also additional resources listed there that can get you started if you want to dig in a bit deeper. If you start trying to use the examples and run into any issues, please don't hesitate to let us know. =)

https://www.netburner.com/learn/get-on-the-i2c-bus/

Kind Regards,
Jon

I've read the 'Get on the i2c bus' article, but this doesn't cover the MODM7AE70 API.
I figured that the I2C class is for implementing a master interface, the I2CDevice is for implementing a peripheral device.

The documentation lacks many details about what it does exactly. It only explains what are the parameters.

As an example, for the I2C class, we have this function: writeReg8(uint8_t devAddr, uint32_t reg, uint8_t data)
What exactly is this reg? Does the interface sends these on the I2c bus in order? devAddr, reg, data?

Hello,

The description in the docs is: Write an 8-bit value to an I2C slave device register. This is according to the I2C spec, so it would send a byte to the specified I2C device address. Most I2C device data sheets are controlled by writing to registers, which is a term they use. What the device register is/does is dependent on what it is. For example, the microchip gpio port expander has 11 registers, for things like reading and writing gpio pins.

The tools include examples for 5 I2C devices, so it might help to take a look at that also:

Microchip Pickit Serial I2C Demo Board Driver

Demonstrates the use of 5 Microchip I2C Peripherals:
- 24LC0B EEPROM, 2Kbit (256 x 8)
- MCP9800 Temperature sensor
- MCP23008 GPIO port expander, connected to LEDs
- TC1321 10-bit DAC
- MCP3221 12-bit ADC

Thanks! I'll look into that.