What is the maximum no of slaves connected to the master in I2C?
This means that you can have up to 128 devices on the I2C bus, since a 7bit number can be from 0 to 127. When sending out the 7 bit address, we still always send 8 bits. The extra bit is used to inform the slave if the master is writing to it or reading from it. If the bit is zero the master is writing to the slave.
What are I2C addresses?
The first byte of an I2C transfer contains the slave address and the data direction. The address is 7 bits long, followed by the direction bit. A seven bit wide address space theoretically allows 128 I2C addresses – however, some addresses are reserved for special purposes.
Can a microcontroller be used as an I2C slave?
One solution is to roll your own I2C interface. This project presents a relatively easy and inexpensive way to do just that. Specifically, we will use an economical PIC12F1840 IC as a slave I2C device that will interface to an Arduino UNO as well as most any microcontroller board using a single master / multiple slaves, I2C scheme.
What kind of interface does the I2C bus use?
The I2C bus is a standard bidirectional interface that uses a controller, known as the master, to communicate with slave devices. A slave may not transmit data unless it has been addressed by the
How to connect multiple I2C devices to an Arduino?
These are tied together from both sensors and connect to the +5V pin of the arduino. And these complete the hardware connections from the arduino microcontroller to the I 2 C sensors. The code so that we can connect the I 2 C TC74 sensors to an arduino microcontroller is shown below.
How does a PIC microcontroller work as a slave?
Array [0] serves as the location where the master (the Arduino) will issue a command, and where the slave (PIC) will report status that will be read by the master. In this regard, the PIC will return one of three values as described in the table.