To use the I²C functionality, you need two pins: a data pin (SDA) for incoming and outgoing information, and a clock pin (SCL ...

If you are short of pins then the analog demux approach works (a 74HC4052 demuxing the SCL line to one of 4 I2C devices, all sharing the same SDA should give you 4 independent devices with only 4 ...

Here’s a hack: If you are lacking in the free pins department, try swapping SCL & SDA for a free second i2c bus. Like this: MCU.GPIO_A – device1.SCL – device2.SDA ...

Using that Chinese module, you can use only the SDA and SCL pins of your Arduino, or any microcontroller capable of I 2 C communication, to handle up to 8 digital I/O ports! PCF8574 Module. When ...

Of the microcontroller’s six general-purpose I/O pins, two control the SDA (system-data) and SCL (system-clock-line) output signals, one controls an LED, and one accepts the analog input. SDA and SCL ...