I’m wondering I can use my 5v Arduino Nano with Qwiic devices designed for 3.3v SDA/SCL.
I know ‘SparkFun Qwiic Shield for Arduino Nano’ has a jumper for 5v Arduino, but is it for Qwiic devices designed for 5v SDA/SCL?
Similar discussions for 5V Arduino with 3.3V I2C devices:
-
I2C Bus with 3.3v and 5.0v Device <https://forum.arduino.cc/index.php?topic=116345.0>
-
3.3V Sensors for I2C with Mega 2560 Rev 3 <https://forum.arduino.cc/index.php?topic=574509.0>
-
Three 3.3V sensors using I2C on Mega2560 <https://www.reddit.com/r/arduino/commen … _mega2560/>
After examining the hook up guide for ‘SparkFun Qwiic Shield for Arduino Nano’, I recognize the shield is exactly what I need. It has a logic shifting circuit that provides proper signal to Qwiic’s 3.3V SDA/SCL even though Arduino’s I/O level is 5V. The jumper for 5V is just select the level of the Arduino side but not for Qwiic side.
Reference:
- SparkFun Qwiic Shield for Arduino Nano Hookup Guide
Logic Shifting Circuit and IOREF Jumper
<https://learn.sparkfun.com/tutorials/sp … okup-guide>
- Schematic (PDF)