[2024-feb-29] Sad news: Eric Layton aka Nocturnal Slacker aka vtel57 passed away on Feb 26th, shortly after hospitalization. He was one of our Wiki's most prominent admins. He will be missed.
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howtos:hardware:arm:interfacing_i2c_devices [2014/12/29 13:24 (UTC)] – interfacing_i2c_devices renamed to howtos:hardware:arm:interfacing_i2c_devices (This was misplaced in the Wiki namespace root) alienbob | howtos:hardware:arm:interfacing_i2c_devices [2023/05/28 13:14 (UTC)] – [Preface] louigi600 | ||
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====== Preface ====== | ====== Preface ====== | ||
- | Most modern PC have several internal components that communicate vital information, | + | Most modern PC have several internal components that communicate vital information, |
+ | Should you want to hack one of the many I2C busses on your PC the easiest one to access is the one in the DIMM modules. Modern DIMM modules have an I2C eprom in them that the bios reads to find out the characteristics of the DIMM module. Since the DIMM module can be removed from PC and hacked separately without risking to damage permanently your PC it is probably your safest option. | ||
====== Preparing Your Host System ====== | ====== Preparing Your Host System ====== | ||
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===== Detecting Connected Devices ===== | ===== Detecting Connected Devices ===== | ||
- | There are probably many ways to determine what's connected to an I2C bus, I chose to use stuff out of the [[http:// | + | There are probably many ways to determine what's connected to an I2C bus, I chose to use stuff out of the [[http:// |
First thing you want to know is what I2C busses are present on your system as there may be more then one and looking in the wrong bus may be frustrating: | First thing you want to know is what I2C busses are present on your system as there may be more then one and looking in the wrong bus may be frustrating: | ||
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====== Voltage Level Shifting ====== | ====== Voltage Level Shifting ====== | ||
You may end up with heterogeneous voltage level devices and if you have many devices the correct way to work around this problem is by using bidirectional I2C voltage level shifters like the [[ http:// | You may end up with heterogeneous voltage level devices and if you have many devices the correct way to work around this problem is by using bidirectional I2C voltage level shifters like the [[ http:// | ||
- | This is how I connected my 5v IMU pcb to a 3.3v I2C bus on my RaspberryPI: | + | This is how I connected my 5v IMU pcb to a 3.3v I2C bus on my RaspberryPI: |
====== Sources ====== | ====== Sources ====== |