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# Summary
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PICA (Python-based Instrument Control and Automation) is a modular, open-source software suite designed to automate advanced transport measurements for electronic devices and chemical samples. PICA is designed as a versatile framework capable of operating on any standard laboratory workstation.
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It provides an extensible, unified graphical user interface (GUI) for orchestrating high-precision instruments, specifically source-measure units, nanovoltmeters, temperature controllers, and LCR metres. Built on the robust Python scientific ecosystem, PICA leverages community standard libraries as an alternative to licensed commercial software for instrument control.
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By utilising `threading` and `multiprocessing` capabilities, PICA ensures that the entire hardware ecosystem functions seamlessly and as a single cohesive unit. This allows the system to perform automated protocols, including temperature-dependent resistivity, current voltage (I-V) characterisation, capacitance characterisation, and pyroelectric current measurement, without requiring physical reconfiguration of the measurement setups. The suite supports characterisation across a vast resistance range of 24 orders of magnitude (10 nΩ to 10 PΩ) and orchestrates measurements under varying magnetic fields and temperatures.
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It provides an extensible, unified graphical user interface (GUI) for orchestrating high-precision instruments, specifically current source (DC/AC) units, nanovoltmeters, high resistance electrometer, impedance analyzer, and temperature controllers. Built on the robust Python scientific ecosystem, PICA leverages community standard libraries as an alternative to licensed commercial software for instrument control.
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By utilising `threading` and `multiprocessing` capabilities, PICA ensures that the entire hardware ecosystem functions seamlessly and as a single cohesive unit. This allows the system to perform automated protocols, including temperature-dependent wide range resistance measurement (10^{-8} - 10^{18} Ohm), current voltage (I-V) characterisation, capacitance characterisation, and pyroelectric current measurementand orchestrates measurements under varying magnetic fields and temperatures, without requiring physical reconfiguration of the measurement setups.
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# Statement of need
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While powerful ecosystem libraries such as PyVISA [@grecco2023pyvisa] and PyMeasure [@pymeasure_2025] provide the foundational drivers for instrumental communication, they are fundamentally software libraries that require the user to write and maintain code. This creates a barrier to entry for researchers requiring direct data acquisition without the overhead of developing and maintaining a custom codebase.
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PICA addresses this gap by functioning as a turnkey application rather than as a library. It offers a "ready-to-run" graphical interface that abstracts the underlying control logic, allowing experimentalists to focus on data acquisition without needing to develop custom software scripts for the supported hardware configurations.
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PICA’s architecture is designed to be highly configurable, enabling users to readily adapt it to their specific requirements and to implement user‑defined protocols in addition to the standard measurement protocols already provided. It eliminates the need for reconfiguring the measurement setup to achieve comprehensive characterisation, enabling continuous operation across the full range from Delta-mode low-resistance measurements to high-impedance electrometric measurements, with the primary goal of PICA being to facilitate the precise characterisation of materials ranging from low-noise superconductors to high-band gap insulators (covering 24 orders of magnitude in resistance) using a single unified framework.
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PICA’s architecture is designed to be highly configurable, enabling users to readily adapt it to their specific requirements and to implement user‑defined protocols in addition to the standard measurement protocols already provided. It eliminates the need for reconfiguring the measurement setup to achieve comprehensive characterisation, enabling continuous operation across the full range from Delta-mode low-resistance measurements (current reversal technique effectively removes constant offsets and improves the signal-to-noise ratio) to high-impedance electrometric measurements, ranging from low-noise superconductors to high-band gap insulators (covering 24 orders of magnitude in resistance) using a single unified framework. {ADD 2-3 LINE THE MEASUREMENT OUTCOME FROM LCR AND ELECTROMETER}, with the primary goal of PICA being to facilitate the precise characterisation of materials
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The system is currently validated with industry-standard hardware, including the Keithley 6221 Current Source, the Keithley 2182 Nanovoltmeter, and the Keithley 6517B Electrometer etc. While the current implementation drives specific instruments, the underlying framework is hardware agnostic. Researchers using different hardware models need only replace the specific SCPI commands with their instrument equivalent commands to utilise the suite.
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The system is currently validated with industry-standard hardware, including the AC-DC current source (Model: 6221, Keithley), the Keithley 2182 Nanovoltmeter, and the Keithley 6517B Electrometer etc. While the current implementation drives specific instruments, the underlying framework is hardware agnostic. Researchers using different hardware models need only replace the specific SCPI commands with their instrument equivalent commands to utilise the suite.
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It differentiates itself through the following unique features:
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