I2C devices communicate with 2 signals, called SDA and SCL. Normally a 4.7K pullup resistor is connected between each signal and power (+3.3V on Teensy 3.0, +5V on Teensy 2.0). On Teensy 2.0, 4.0, and 4.1, the weak internal pullup resistors may be sufficient for short wires to a si...
We still have to find out how to connect theVINandGNDpins. According to theBME280 datasheet,VDDmain supply voltage range: 1.71V to 3.6V. The Arduino connectorCN16provides either 3.3V or 5V, so we’ll chose 3.3V (pin 4). And this connector also has multiple ground pins, among which ...