Difference between revisions of "Observer Nodes"

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|The custom add-on card connected to the Raspberry Pi 3 embeds a power and latency profiling unit, as well as a GPIO tracing unit. The power profiling unit captures voltage and current using a 125 kHz simultaneous-sampling 12-bit current and voltage ADC.  
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|The custom add-on card connected to the Raspberry Pi 3 embeds a power and latency profiling unit, as well as a GPIO tracing unit. The power profiling unit captures voltage and current using a 125 kHz simultaneous-sampling 12-bit current and voltage analog-to-digital converter.  
 
The GPIO tracing and latency profiling units allow simultaneous tracing and actuation of up to 8 GPIO pins per target platform. Observer nodes equipped with a GPS unit can generate precise timestamps for externally triggered events. Nodes without direct GPS connectivity can synchronize to the rest of the network using NTP with a typical accuracy well below 10μs. Target nodes can be individually powered on/off in software, hence allowing to control the network density and to emulate node failures (e.g., due to an early battery depletion) by software.  
 
The GPIO tracing and latency profiling units allow simultaneous tracing and actuation of up to 8 GPIO pins per target platform. Observer nodes equipped with a GPS unit can generate precise timestamps for externally triggered events. Nodes without direct GPS connectivity can synchronize to the rest of the network using NTP with a typical accuracy well below 10μs. Target nodes can be individually powered on/off in software, hence allowing to control the network density and to emulate node failures (e.g., due to an early battery depletion) by software.  
 
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Revision as of 11:00, 10 November 2019


D-Cube makes use of several Raspberry Pi 3 nodes, each connected to a custom add-on card, as unobtrusive observer nodes to measure the reliability, latency, and energy-efficiency of IoT protocols running on a given target platform.

Each observer, which is powered by PoE and connected via Ethernet to a central server, is completely agnostic to the hardware platform chosen as a target, as long as the latter can be connected via USB to the custom add-on card.

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Observers architecture.png
The custom add-on card connected to the Raspberry Pi 3 embeds a power and latency profiling unit, as well as a GPIO tracing unit. The power profiling unit captures voltage and current using a 125 kHz simultaneous-sampling 12-bit current and voltage analog-to-digital converter.

The GPIO tracing and latency profiling units allow simultaneous tracing and actuation of up to 8 GPIO pins per target platform. Observer nodes equipped with a GPS unit can generate precise timestamps for externally triggered events. Nodes without direct GPS connectivity can synchronize to the rest of the network using NTP with a typical accuracy well below 10μs. Target nodes can be individually powered on/off in software, hence allowing to control the network density and to emulate node failures (e.g., due to an early battery depletion) by software.

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Observers card.png

Under construction.

GIT repository