#define CMD_I2C_IO_BEGIN (1<<0) // flag for I2C_IO #define CMD_I2C_IO_END (1<<1) // flag for I2C_IO /* linux kernel flags */ #define I2C_M_TEN 0x10 /* we have a ten bit chip address */ #define ...

Connecting two or more I2C devices sometimes requires level adaptation since on device might be using 3V3 and another 5V. Providing adequate isolation would also be very handy. I needed such a setup ...

[Johngineer] found himself in need of an I2C sniffer, but didn’t have one available. Necessity is the mother of invention, so he put together this I2C sniffer sketch for Arduino. The arduino will ...

In 2015 I did a blog post where I reverse engineered the i2c protocol which Dandfoss and Thermia pumps are using (sorry post is in Finnish): https ...

Today, We will review the Cytron Maker Uno RP2040 development board combining the Arduino UNO form factor with the Raspberry Pi RP2040 microcontroller that makes it programmable with the Arduino IDE ...

16 channels, Toshiba PHOTORELAY 100V no clicking, no signal bounce. Switch signals on/off, 2 Amps DC or AC using I2C bus. IO extender PCF9535 Allows many devices on single bus ( > 100 channels). Uses ...