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- #Pi arduino i2c example two way data wiringpi how to#
- #Pi arduino i2c example two way data wiringpi software#
- #Pi arduino i2c example two way data wiringpi code#
- #Pi arduino i2c example two way data wiringpi download#
It takes 3 parameters: the file descriptor of the selected device, the register address, and the data to write. The function wiringPiI2CWriteReg8() allows you to write a 8-bit register on the device. That’s a good opportunity here to write to a register with the WiringPi library. To get acceleration data from the ADX元45 sensor, we need to change its mode from standby mode (default) to measurement mode.Īs stated in the datasheet we have to set the ‘Measure Bit’ to 1, which is the 4th bit of the 8-bit register, hence the 0b00001000 value.
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Writing to a register // Switch device to measurement mode Once the communication is successfully initiated, we can start interacting with the sensor. It will try to connect to that device, and return a file descriptor. This function takes the device ID as a parameter. The first thing we do is to setup the I2C communication with the wiringPiI2CSetup() function. Std::cout << "I2C communication successfully setup.\n" Std::cout << "Failed to init I2C communication.\n" Init I2C communication int main (int argc, char **argv) Here we will use the POWER_CTL register, as well as the data registers for all 3 axis.
#Pi arduino i2c example two way data wiringpi code#
This is a good practice, so you won’t mix up register addresses in your code and it will save you some debugging time. We use define tags to set the device ID and registers. Here we include the wiringPiI2C header, which contains all I2C functions related to WiringPi (see this header file on GitHub). I’ll explain everything in a few seconds. Here’s the complete code to setup the I2C communication with WiringPi, read X, Y, and Z accelerations, and print the data. Complete code example with WiringPiĬreate a file named adxl345-i2c.cpp (or whatever you want). If you see this (device ID is 0x53) then your setup was correctly done.
#Pi arduino i2c example two way data wiringpi software#
Once you’re done with hardware and software setup, and have reboot your Pi, run: i2cdetect -y 1Ġ0: -ġ0: -Ģ0: -ģ0: -Ĥ0: -ĥ0: - 53 -Ħ0:. You can now use I2C! Check that your device is detected Make sure you reboot your Pi after you’ve done this, because the configuration is done during the boot. Just un-comment the line (remove the leading ‘#”), save and exit the file, and that’s it. Search for “i2c”, you’ll find this line: #dtparam=i2c_arm=on Open (with sudo) the “/boot/config.txt” file. There are many ways to do that, but the simplest one is just by editing a config file. The setup is the same whether you use Raspbian or Ubuntu for Raspberry Pi.īy default I2C is disabled, you have to enable it yourself. For this tutorial we’ll decide to use this ID.
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SDA (SPI data) connects to SDA (pin 2 on the Pi).The device can be powered by a 3.3V power source, so connect Vcc to one of the 3.3V pins of the Pi.First, link the GND pin of the sensor to one of the GNDs pins of the Raspberry Pi.
#Pi arduino i2c example two way data wiringpi how to#
You are learning how to use Raspberry Pi to build your own projects?Ĭheck out Raspberry Pi For Beginners and learn step by step.
#Pi arduino i2c example two way data wiringpi download#
You can find and download the complete datasheet here. In this WiringPi I2C tutorial we’ll use the ADX元45 digital accelerometer sensor.