I2C/TWI sniffer
A handy tool is the TWI sniffer, which silently reads all traffic on an I2C (or TWI as per Atmel) network and forwards it in human-readable ASCII format on the serial interface. The use of an UART-to-USB module like FTDI's UB232R allows connection to any modern computer.
For schematics and source code see below. The code is copyrighted and licensed as noted in the source files. Thanks to the developer for sharing.
Schematic and source code
Source code
| Version 1.0 | [download] |
Schematics
| Version 1.0 | [download] |
![[download]](http://signals.us-modellbahn.net/files/TOOLS/twi-sniffer/twi-sniffer-schem.jpg){kind=link}