Diy qwiic cables?

[claude_j_greengrass]

@Koepel

Which Arduino board do you use ?
The Arduino Mega 2560 ? That is the only Arduino board with 10k pullup resistors for SDA and SCL to 5V. If you connect that to a cheap sensor module, then you might push 5V into the sensor chip via its SDA and SCL pins.

ELEGOO MEGA R3 Board ATmega 2560

@Koepel

So if you have a Sparkfun board and Adafruit modules, than you can expect problems.

All of the IMUs are Adafruit: 3x 9-DOF Orientation IMU Fusion Breakout - BNO085 and 2x Adafruit MPU-6050 6-DoF Accel and Gyro Sensor. The Mux is SparkFun Qwiic Mux Breakout - 8 Channel (TCA9548A). The largest I2C span is between the 2560 and the Mux: about 5 feet which is bridged with an Ethernet cable and two SparkFun QwiicBus - EndPoint. This breakout uses NXP’s PCA9615 IC, which converts the two default I2C signals into four differential signals, two for SCL and two for SDA. Connection between the sensors and the MUX are Qwiic cables, the longest being 12 inches.

@Koepel

The "STEMMA", "STEMMA QT", "Qwiic", "Grove" are all wrong. That is why they have to use cables with separate wires.

FYI: At least one Qwiic cable from Sparkfun is a flat ribbon.