**By:** webdevel@sparkhausmedia.com (Lori White)
© Lead Image © urbanhearts, Fotolia.com
Use common logic with DIP switches to determine functionality, IP addresses, hostnames, and other functional differences on repetitive hardware arrangements.
There are many projects where a common hardware setup is repeated in multiple locations.
For systems with only three microcontrollers, creating unique logic for each instances is a sensible approach.
However, when you work with over ten controllers, this can be a nightmare to maintain, debug, or add a new functionality.
This problem has a solution that is commonly used in industrial Modbus [1] and Remote Terminal Unit (RTU) [2] applications: it is to make use of Dual In-line Package (DIP) switches in the hardware setup.
Typical applications for DIP switches include module addressing, defining I/O, and enabled debug features (Figure 1).
Figure 2 shows DIP switches being used as selectors on relay, input/output boards, and a Raspberry Pi I/O shield.
[…]
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**📚 Original Source:**
[Run a Single Program at Different Microcontroller Locations](http://www.linux-magazine.com/Issues/2026/308/Managing-Microcontrollers)
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