ResistorDesigner

A Resistor Network Designer with Dynamic Programming and BFS.

How to Run (GUI)

You can also run the graphical interface built with Tkinter:

python Ex01.gui.py

GUI Features

• Target Resistance: Enter the resistance value you want to achieve.
• Maximum Depth: The search depth — larger values try more resistor combinations.
• Error Threshold: Allowed deviation (tolerance) between target and result.

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Adding Resistors

• E‑Series (batch add): Use the dropdowns to select a resistor series (E6, E12, E24) and a scale factor (1, 10, 100, 1k, etc.), then click Add E-Series.
• Manual Add: Enter a resistance value and click Add to insert it into the resistor library.
• Edit/Delete/Clear: Select a resistor and use the buttons to modify or remove it.

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Running the Calculation

1. Set Target Resistance, Max Depth, and Error Threshold.
2. Ensure you have resistors listed in the Resistor Library.
3. Click Run Calculation.
   • The program will iteratively search for the best resistor network.
   • Intermediate results appear in the output panel.
4. Click Stop at any time to end the search early.

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Output Panel

The output shows:

• Current best candidate (closest resistance found).
• Depth of combination.
• Number of search calls performed.
• Final result path: step‑by‑step resistor network (serial/parallel).

Example (simplified):

计算开始: 目标 960Ω, 深度=5
候选: 960.000Ω
深度: 3
搜索次数: 152
串联 330Ω → 并联 680Ω → 串联 150Ω → 960Ω
搜索完成！
最佳结果: 960.000Ω

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How to Run (Command Line)

In the project folder, type

python Ex00.resistor_designer_hjb.py

Below is a sample output from the program.

Worst Case Total Calculations: 46656
Target Resistance (ohm): 123.456
Solution may be better if considering a decision length longer than 3.
---- begin from 0 ohm ----
serial 22.0 ohm
serial 68.0 ohm
serial 33.0 ohm
---- circuit complete ----
Result: 123.0 ohm

Key Parameters in the Program

• scale_list
  • Scales of the available resistor
• res_6_list
  • Standard E6 resistor values
• max_decision_chain_length
  • Maximum Dynamic Programming Depth and maximum number of resistors used. The worst-case number of search cases grow exponentially with this parameter.
• decision_list
  • You can also append your available resistors into decision_list with the following template.

my_res = 123.0
decision_list.append(Decision("serial", my_res))
decision_list.append(Decision("parallel", my_res))

License

This project is licensed under the GNU GPL v3.