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please explain what R12 does.

why need a resistor there
1y
@copilot please explain what R12 does.
1y
Certainly! Let's analyze the role of resistor R12 in your electronic chess board project.
Details of R12:
  • Designator: R12
  • Pins: 1 (P1), 2 (P2)
  • Resistance: 4.7 Ω
Nets Connected to R12:
  • R12:P1 is connected to Net $$Q3 - G$$ which includes Q3:(G)(G).
  • R12:P2 is connected to Net $$R12 - P2$$ which includes:
    • Q3:(D)(D)
    • R10:(P2)(P2)
    • Q1:(D)(D)
    • BT1 5V:(CATHODE)(CATHODE)
    • Q2:(D)(D)
    • R11:(P2)(P2)
    • Q4:(D)(D)
    • R13:(P2)(P2)
    • R15:(P2)(P2)
    • R1:(P1)(P1)
    • Q8:(D)(D)
    • R16:(P2)(P2)
    • Q7:(D)(D)
    • Q6:(D)(D)
    • R14:(P2)(P2)
    • Q5:(D)(D)
Analyzing the Function:
  • Connection to MOSFET Gates: The resistor R12 is linked to the gate of MOSFET Q3 on one end (P1).
    • Role in Gate Control: This placement generally indicates that R12 is a gate resistor which helps to limit the inrush current when the gate capacitance is charged and helps in controlling the switching speed of the MOSFET.
  • Distribution of GND: On the other end (P2), R12 is tied to a network encompassing the drains of multiple MOSFETs and the cathode of the power source (BT1 5V).
    • Current Limiting: This configuration indicates that R12 might serve to limit current or provide a stable reference (such as ground or a specific voltage) to the gates of the MOSFETs listed in the connection.
Conclusion:
R12 seems to function primarily as a gate resistor for MOSFET Q3. It ensures controlled switching by managing the gate capacitance inrush current and potentially assists in limiting current or providing a stable ground reference for multiple MOSFETs' gates.
Connections:
  • Connect R12:P1 to Q3:G.
  • Connect R12:P2 to Q3:D, Q1:D, BT1 5V:CATHODE, Q2:D, Q4:D, Q8:D, Q7:D, Q6:D, Q5:D, R10:P2, R11:P2, R13:P2, R15:P2, R1:P1, R16:P2, and R14:P2.
1y
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Demo video: https://youtu.be/17uHfl7AOzo

Demo video:

1

5y
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1
Shown diodes are LED

Shown diodes are LED
5y
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SPST switches are neodymium magnet

SPST switches are neodymium magnet
5y
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3


  • Ground
    A common return path for electric current. Commonly known as ground.
  • Net Portal
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  • Power Net Portal
    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
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    A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
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Electronic Chess Board

An Arduino based electronics chess board, which is great for real time control of the devices on the chess board, but it does not use a conventional operating system like Unix/Debian/Raspian. Therefore Stockfish and most other strong chess engines won’t run on it. I believe there are a few chess engines that do run on Arduino http://chessprogramming.wikispaces.com/Arduino , but they will not be as strong as Stockfish.

Properties

Properties describe core aspects of the project.

Pricing & Availability

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