Switch-State Aggregation Using DAC/ADC to Reduce I/O Polling
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Solution Overview
Problem
Monitoring a large number of switches efficiently is challenging due to the limitations of microprocessor I/O interfaces, as existing methods require polling each switch individually, which is time-consuming and restricts the use of I/O interfaces for other purposes.
Innovation Solution
A system utilizing a programmable processor and digital-to-analog converters (DACs) to convert binary switch states into analog signals, allowing for simultaneous monitoring of multiple switches through analog-to-digital conversion, enabling efficient communication of switch states without the need for separate I/O lines for each switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate I/O lines are used for each switch, then each switch can be monitored individually, but the number of I/O interfaces required increases significantly
Solution Approach 1:
Multiple switch state signals are merged into a single digital value that represents the collective state of all switches. This digital value is then converted to an analog signal, which is read by a single I/O interface, thereby monitoring multiple switches without requiring multiple separate I/O lines.
Solution Approach 2:
A digital-to-analog converter (DAC) is introduced as an intermediary device between the switch states and the microprocessor I/O interface. The DAC converts the digital switch state information into an analog signal that can be read by a single I/O interface, eliminating the need for multiple dedicated I/O lines.
2Loss of information
If polling is performed on each switch individually, then complete switch state information is obtained, but the time required increases significantly
Solution Approach 1:
The patent combines multiple individual switch state readings into a single aggregated digital value. Instead of reading each switch separately through multiple polling operations, all switch states are consolidated into one value that can be converted to an analog signal and read in a single operation, dramatically reducing the time required.
Solution Approach 2:
The patent changes the parameter representation from individual binary switch states to a single analog voltage level that encodes the collective state of all switches. This parameter transformation allows the microprocessor to obtain complete switch state information through a single analog reading rather than multiple digital polls.
3Reliability
If dedicated I/O interfaces are used for switch monitoring, then reliable switch state detection is achieved, but those I/O interfaces cannot be used for other purposes
Solution Approach 1:
The patent makes the microprocessor's I/O interfaces multi-functional by using them both for reading analog signals (which encode switch states) and for other general-purpose I/O operations. The single I/O interface that reads the analog signal from the DAC can be used for switch monitoring during analog reading mode while maintaining capability for other digital I/O functions, thereby increasing versatility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces the time required to monitor switch states and allows the same I/O lines to be used for both switch state detection and data communication, enhancing efficiency and flexibility.
Implementation Method 1
a digital-to-analog converter to convert a binary code presented on inputs of the digital-to-analog converter into an analog signal proportional to the binary code
Implementation Method 2
An analog-to-digital conversion is performed on the analog signal output by the digital-to-analog converter to produce a digital representation of the state of the plurality of switches
Data Source
AI summary
One switch-state aggregation technique uses a digital-to-analog converter in combination with an analog-to-digital converter to aggregate the state of a plurality of switches. Another switch-state aggregation technique uses input/output lines of a processor to aggregate the state of a plurality of switches and to communicate data other than the state of the switches. These techniques can be used to aggregate information about whether a plug or other connector is inserted into the ports of a patch panel or other telecommunication or communication assembly, system, or device.