BODMAS Rule Circuit
Bodmas rule circuit The BODMAS rule is an acronym that aids children in remembering the order of mathematical operations. The BODMAS rule is a mnemonic that can be used to remember the or…
Know the mission before touching a wire.
Understand what you are making, prepare the right tools, and make the workbench safe.
Project details
BODMAS Rule Circuit is a electronics project. Bodmas rule circuit The BODMAS rule is an acronym that aids children in remembering the order of mathematical operations. The BODMAS rule is a mnemonic that can be used to remember the or…
- Source pages
- 230-233
- Named parts
- 5
- Build goal
- Working, tested prototype
Tools you need
- Digital multimeter
- Wire stripper and side cutters
- Soldering iron with a fine tip
- Current-limited bench supply
Use eye protection, good lighting, and a clean insulated surface throughout the build.
Safety precautions
- Disconnect every power source before changing a connection.
- Check component polarity, pinout, and supply voltage twice.
- Use a current limit for the first power-up.
- Keep liquids, loose metal, and uninsulated wires away from the bench.
Gather, identify, and understand every part.
Use the standardized inventory, then open What's this? to learn each part's role, advantages, limitations, handling, and specifications.
What's this?Image, role, pros, cons, handling & specifications
Input selector switches
A named project component whose exact role is defined by the source circuit and build guide.
What it does hereIt performs a documented electrical, control, interface, or construction function in this project.
Buy / compare this part ↗Advantages
- Selected for this project
- Can be checked independently
- Supports modular troubleshooting
Limitations
- Substitutes may differ
- Generic names can hide variants
- Pinouts and ratings vary
Handling
- Compare the received part with the source
- Keep it labelled
- Do not force connectors or adjusters
Specifications to verify
- Use the exact model, value, package, and rating listed for Input selector switches; similar-looking parts are not always interchangeable.
- Confirm dimensions, ratings, connection method, polarity, and environmental limits.
What's this?Image, role, pros, cons, handling & specifications
Arithmetic logic circuit shown in the schematic
A named project component whose exact role is defined by the source circuit and build guide.
What it does hereIt performs a documented electrical, control, interface, or construction function in this project.
Buy / compare this part ↗Advantages
- Selected for this project
- Can be checked independently
- Supports modular troubleshooting
Limitations
- Substitutes may differ
- Generic names can hide variants
- Pinouts and ratings vary
Handling
- Compare the received part with the source
- Keep it labelled
- Do not force connectors or adjusters
Specifications to verify
- Use the exact model, value, package, and rating listed for Arithmetic logic circuit shown in the schematic; similar-looking parts are not always interchangeable.
- Confirm dimensions, ratings, connection method, polarity, and environmental limits.
What's this?Image, role, pros, cons, handling & specifications
Result indicator LEDs
A named project component whose exact role is defined by the source circuit and build guide.
What it does hereIt performs a documented electrical, control, interface, or construction function in this project.
Buy / compare this part ↗Advantages
- Selected for this project
- Can be checked independently
- Supports modular troubleshooting
Limitations
- Substitutes may differ
- Generic names can hide variants
- Pinouts and ratings vary
Handling
- Compare the received part with the source
- Keep it labelled
- Do not force connectors or adjusters
Specifications to verify
- Use the exact model, value, package, and rating listed for Result indicator LEDs; similar-looking parts are not always interchangeable.
- Confirm dimensions, ratings, connection method, polarity, and environmental limits.
What's this?Image, role, pros, cons, handling & specifications
Current-limiting resistors
A named project component whose exact role is defined by the source circuit and build guide.
What it does hereIt performs a documented electrical, control, interface, or construction function in this project.
Buy / compare this part ↗Advantages
- Selected for this project
- Can be checked independently
- Supports modular troubleshooting
Limitations
- Substitutes may differ
- Generic names can hide variants
- Pinouts and ratings vary
Handling
- Compare the received part with the source
- Keep it labelled
- Do not force connectors or adjusters
Specifications to verify
- Use the exact model, value, package, and rating listed for Current-limiting resistors; similar-looking parts are not always interchangeable.
- Confirm dimensions, ratings, connection method, polarity, and environmental limits.
What's this?Image, role, pros, cons, handling & specifications
Regulated DC supply
A power component supplies, converts, stores, or regulates energy for the project.
What it does hereIt must provide the documented voltage, polarity, isolation, and sufficient current safely.
Buy / compare this part ↗Advantages
- Stable power improves reliability
- Current limiting protects first tests
- Regulation reduces resets and noise
Limitations
- Wrong polarity can cause immediate damage
- Underrated parts overheat
- Mains circuits require qualified supervision
Handling
- Measure output before connection
- Use a fuse or current limit
- Insulate exposed conductors
Specifications to verify
- Use the exact model, value, package, and rating listed for Regulated DC supply; similar-looking parts are not always interchangeable.
- Confirm input/output voltage, current, polarity, connector, isolation, and thermal rating.
Connect one verified path at a time.
Explore the named components and standardized signal flow, then use Source Check to verify exact physical pins, values, and topology before applying power.
Trace this circuit.
BODMAS Rule Circuit: interactive parts, standardized terminals, responsive anchored wires, student explanations, and the original circuit reference in one shared system.
Trace before wiring
Follow power, ground, inputs, processing, and outputs in that order. Never guess a pin from package shape alone.
Connect with power off
Make short, labelled connections and share a common ground only where the schematic requires it.
Inspect every joint
Check continuity, polarity, adjacent shorts, and loose connections before the first power-up.
Open all source diagrams and build views 2 visuals
Confirm the hardware-only control path.
This project does not include firmware in the source. The circuit itself provides the required behaviour.
How to connect
- Match every controller label to the circuit view and source pin map.
- Join grounds before signal wires when separate low-voltage supplies are used.
- Keep motors, relays, pumps, and other loads on a suitable driver and external supply.
Common mistakes
Reversed VCC/GND, board-label versus GPIO-number confusion, missing common ground, and charge-only USB cables.
Troubleshoot
Disconnect loads, continuity-test one path at a time, then test with a current limit.
Software preparation
No IDE, board package, library, or firmware upload is required for this project.
If you add a programmable controller as an extension, document its pin map separately.
How to upload code
The original design is implemented entirely in hardware, so proceed after verifying the circuit and supply.
Assemble, deploy, test, and troubleshoot.
Use the complete source notes in build order, then pass the final checks before calling the project finished.
Build in functional stages
- Power and regulation
- Controller or processing stage
- Inputs and sensors
- Outputs and loads
- Enclosure and strain relief
Power up safely
- Inspect unpowered continuity first
- Apply the lowest safe current limit
- Measure supply rails before signals
- Add one load at a time
- Record expected and actual results
Work from simple to complex
- Confirm power, ground, polarity, and orientation
- Compare each pin with the source
- Test inputs separately from outputs
- Replace only one variable at a time
- Power off before every correction
Follow the documented instructions.
These notes come from this project's source and remain in their original order.
Project overview
Project build noteBodmas rule circuit The BODMAS rule is an acronym that aids children in remembering the order of mathematical operations. The BODMAS rule is a mnemonic that can be used to remember the order of the several arithmetical operators. The BODMAS acronym stands for bracket, of, division, multiplication, and addition and subtraction. A mathematical expression may involve multiple operators, but only one of those operators must be carried out first in order for the expression to be valid. The following is the order of priority, which we are all aware with from our time spent in school: "Bracket" comes first, followed by "of," "division," "multiplication," "addition," and "subtraction" in that same order. This circuit would be very helpful to novices who are just starting out in the field of mathematics as a learning aid. This circuit looks for any incorrect answers as well as any incorrect orders. The truth table of the priority checker that was described is displayed here. In the table, the letters written in uppercase (B, O, D, etc.) represent the inputs, while the letters written in lowercase (b, o, d, etc.) represent the outputs.
b = B o = B. O d = B. O. D m = B. O. D. M a = B. O. D. M. A s = B. O. D. M. A. S If an input variable is set to logic "0," it indicates that the relevant mathematical operation is not included in the expression. On the other hand, if the variable is set to logic "1," the relevant mathematical operation is included in the expression. The expression may contain any number of operations (any number of inputs may be at logic ‘1’), but only one output will be at logic ‘1.’ This indicates that a specific task has the highest priority and must be completed before any others can be done. (The 'don't care' inputs are denoted by an X in the truth table; this means that they might be at logic 0 or logic 1, respectively.) You may simply derive the following Boolean
equations based on the truth table, which are as follows
Project build noteCircuit operation The logic circuit of the priority checker comprises NOT and AND gates, LEDs and a few resistors. The working of the circuit is as simple as its structure. When one of the six microswitches, labeled 'B,' 'O,'..., 'S,' is pressed, the value of the variable that it controls is set to high (logic 1). The flashing of a particular LED, holding the same name as the output variable, will signify its top priority.
For example, pushing ‘B,’ ‘M’ and ‘A’ simultaneously will cause only LED ‘b’ to turn ‘on,’ indicating that the bracket action has the highest priority. If ‘M’ and ‘A’ are pressed, LED ‘m’ will glow, indicating that ‘multiplication’ is to be carried out prior to ‘addition.’
You built BODMAS Rule Circuit.
You followed the full workflow from understanding the mission to testing the finished project. That is a real engineering achievement - well done.
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