This tab scans the I2C bus for occupied addresses and shows which SmartPi module is probably connected there. This is only an assumption based on the address range – reliable identification is not possible this way.

I2C overview

I2C overview

  • The Scan button starts the scan (showing "Scanning…" while it runs).
  • Results table with the columns:
    • Address: the I2C address, e.g. 0x38.
    • Status: "Device found" (green) or "Occupied (kernel driver)" (yellow, if the address is already occupied by a Linux kernel driver).
    • Probably: an estimate of which module is located there. Two addresses are definitely known and are shown without "probably": 0x38 = SmartPi measuring chip, 0x51 = SmartPi real-time clock (RTC). Other detected ranges are shown as "probably: e.digital out", "probably: e.analog in" or "probably: e.4-20mA out".

Example: a newly connected e.digital out module should appear after the scan with "Device found" and the estimate "e.digital out" – this lets you check that the wiring is correct before you set up the module in the actual configuration.