It is even possible to create a little module that connects inline with the existing wiring/cabling. You hook up the 3v SDA and SCL to the 3v side. The 3v is actually an output from the onboard 3v regulator used for the 3v pullups on the 3v side. The 2 channel ones are great for this type of application. I occasionally do some testing without level shifters, but I always use them for my projects for boards like the esp8266 that are 3v when using 5v i2c devices like PCF8574 based backpacks/LCDs and RTC modules. If you don't want to ever have to deal these types of potential issues, then I'd recommend using a level shifter. Yeah it may not cause any damage on the default i2c pins on DUE when using a single slave with pullups to 5v but, IMO, it is an accident waiting to happen. Then there is the issue of having to alter the slave devices that have pullups on them to remove the pullup to 5v. you can end up in situations where it works when hooked up to a PC USB port but then fails when hooked up a wall adapter because the supply voltage is different. The 32-bit Arduino Due, based on the Atmel SAM3X8E was introduced in 2012. Things like supply voltage and temperature or even cables can start to affect operation, particularly if using clock rates above the default 100k. Arduino is an open-source hardware and software company, project, and user community that. It can also create strange issues that can be hard to track down. Yes it is possible to cheat and not use level shifters and get things to work however, be aware that while this can "work", it doesn't always work since things are not really wired up as they should be which is causing signals to be out of spec on one or both ends. LCD should be fine.īill Perry can probably explain it better !!! Note that an I2C library should NOT enable internal pullups (but it does avoid tears before bedtime) So a Uno owner who has removed external pullups from a backpack will still "work" (but it is out of I2C spec) The Wire library on a Uno enables internal pullups. Even if you have several external pullups you are still within I2C spec. The Ebay onboard pullup modules are handy for a Uno. If you have several Ebay modules with mounted 5V pullups the idle voltages can rise above 3.7V which is bad for the 3.3V Due. Many Ebay I2C modules have mounted pullups. I2C lines are idle at 3.7V (3.6V with 1k0) In practice, the backpack pullups (if mounted) are 4k7. In theory, you should remove any other pullups e.g. If you can help me I would be very happy.The Due has onboard pullup resistors on its main SDA, SCL pins. Serial.println("Failed to detect and initialize IMU2!") However, I get no output, if I connect both IMUs and run the following code for two IMUs: #include Serial.println("Failed to detect and initialize IMU!") It works perfectly for one IMU initialized with either LSM6::sa0_high or LSM6::sa0_low, if you connect the corresponding HIGH IMU or LOW IMU: #include The following code is a slightly modified version of the example code “Serial”. So, I have connected the SA0 pin of one IMU to ground, which makes it the LOW IMU, the other is the HIGH IMU. The sensors must have a different address to differentiate between them. I am able to read the sensors individually but not, if they are connected both. I want to read two MinIMU-9 v5 with the Arduino Due via I2C.
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