What to do if your Arduino freezes on I2C?

What to do if your Arduino freezes on I2C?

Initially I wired the Megas up on the same I2C bus, just as I would any other device. When I unplugged one Mega, the other would freeze the next time it tried to address another device on the bus. The solution was to use a hot-swappable I2C buffer.

How does an Arduino start an I2C call?

It generates a Start condition, sends the byte consisting of the address (that we set in the beginTransmission () statement) and the direction bit, which is always 0 here, because these commands are meant for master write operation. Then it sends the data and ends the transmission with a stop condition.

What happens if the I2C bus is stuck?

If the I2C bus has a line stuck low, the program hangs in the wire library. In my application everything is soldered together, but not always properly, so I can get by with a single test at startup. Before invoking Wire.begin. For the OP’s issue, they will want to use this every time they restart communication after an idle period.

How does master read on Arduino I2C work?

For master read operation the action on the I2C bus happens inside the requestFrom () function. It sends a Start condition, followed by the address and the direction bit set to 1 (again you cannot control the value of the direction bit here). Then it reads the bytes, that are coming from the slave until all requested bytes were received.

How to make Arduino Uno work with I2C?

To integrate the SOIC-8 package onto a standard DIP breadboard for Arduinos, I used this adapter from Adafruit: https://www.adafruit.com/product/1212 Had this same issue when using two Megas communicating over I2C, along with other items running on the I2C bus.

Why does my Arduino Uno freeze on power up?

For the OP’s issue, they will want to use this every time they restart communication after an idle period. This is part of a device’s self test on power up. When one thing is assembled wrong, frequently many things are wrong, so we want to continue on and test everything else. Then the user can fix all of the issues at once.

Why is my Arduino not communicating with my Slave?

Catch a situation where the Master (Arduino Yun Shield) cannot communicate with the Slave ( Arduino r3 – with sensor) due to its power supply and/or sensor reading failing. In other words, an Arduino monitoring another Arduino.