Explore the FRS tools library
Discover the calculators, estimators, and learning utilities in the FRS tools library across electronics, robotics, aeromodelling, embedded systems, and core STEM workflows. This page helps students, parents, and schools explore the breadth of the library by topic and learner level.
School Tools
A foundation-focused collection for learners building confidence in electrical basics, robotics concepts, lab maths, aeromodelling, and early embedded thinking.
Basic Electrical
Ohm's Law Calculator
Find voltage, current, or resistance from any two known values using the core Ohm's law relationship.
DC Power Calculator
Calculate DC power from voltage, current, or resistance and convert runtime into practical energy units.
Electronics
Series/Parallel Resistor Calculator
Combine resistor values in series or parallel and calculate equivalent resistance instantly.
Voltage Divider Calculator
Compute output voltage across a resistor divider for signal scaling and basic sensor interfacing.
Resistor Color Code Decoder
Decode resistor color bands into resistance and tolerance values with a beginner-friendly reference view.
RC Time Constant Visualizer
Understand capacitor charging and discharging behavior through RC time-constant calculations.
PWM Duty Cycle to Average Voltage Tool
Translate PWM duty cycle into approximate average output voltage for motor control and LED dimming.
Electronics/Robotics
LED Series Resistor Calculator
Choose the right current-limiting resistor for LEDs from supply voltage, forward voltage, and target current.
Simple Battery Life Estimator
Estimate runtime from battery capacity and load current for kits, small robots, and classroom builds.
Robotics/Mechanical
Gear Ratio & Output Speed Calculator
Relate motor RPM and gear ratio to output speed for beginner robotics and motion systems.
Basic Center of Mass Estimator (2D)
Approximate the center of mass of a robot layout using component positions and relative weights.
Robotics
Wheel Circumference & Robot Speed Calculator
Convert wheel size and RPM into linear speed for line followers, racers, and mobile robots.
Mechanics
Simple Torque vs Force on Lever
Calculate torque from force and lever arm length, or work backward from torque requirements.
Aeromodelling
Wing Loading (Lite) Calculator
Estimate wing loading quickly to compare light, moderate, and heavy aircraft setups.
Aeromodelling/Physics
Projectile Range Calculator
Predict launch range and peak height from speed and angle using introductory projectile motion.
Embedded/Math
Sensor Scaling & Unit Converter
Map raw sensor readings into physical values and handle common unit conversions in one place.
CSE/Electronics
Binary Decimal Hex Converter
Convert values across binary, decimal, and hexadecimal for digital electronics and embedded learning.
Logic Truth Table Generator (2-3 inputs)
Generate truth tables for common logic gates and small digital logic combinations.
General STEM
Percentage Error & Accuracy Calculator
Measure experimental error and accuracy from observed and expected values for lab work.
Math/Embedded
Linear Interpolation Tool for Experiments
Estimate values between calibration points for sensors, experiments, and simple embedded workflows.
Competition/Robotics
Motor RPM and Torque Calculator for Competitions
Compare RPM and torque requirements against payload needs when selecting motors for competition builds.
College Tools
A deeper engineering set for learners working across circuit analysis, mechatronics, power systems, communication links, robotics, and applied design decisions.
Electrical Networks
KCL/KVL Solver for Small Circuits
Solve simple DC circuit networks using Kirchhoff's current and voltage laws.
Nodal & Mesh Analysis Tool
Set up and solve nodal or mesh equations for resistor and source networks with less manual algebra.
Circuit Theory
Thevenin/Norton Equivalent Calculator
Convert a network into its Thevenin or Norton equivalent for faster circuit analysis.
Electronics
RLC Resonance & Bandwidth Calculator
Calculate resonant frequency, Q factor, and bandwidth for series and parallel RLC circuits.
RC/RL Transient Response Calculator
Analyze RC and RL transient behavior, including response timing and rise or decay points.
BJT Bias Point Calculator
Evaluate transistor bias conditions and operating region from supply, resistor, and device inputs.
Analog Electronics
Op-Amp Gain & Bandwidth Tool
Estimate closed-loop gain and bandwidth for common op-amp configurations.
Power Electronics
MOSFET Gate Charge & Switching Loss Estimator
Estimate switching losses from gate charge, supply voltage, and switching frequency.
ESC, Wire Gauge & Fuse Selector
Match current requirements to ESC rating, wire gauge, and fuse selection for safer power systems.
Robotics/Mech
DC Motor Sizing for Mobile Robot
Size drive motors from robot mass, wheel radius, acceleration targets, and terrain assumptions.
Robotics/Mechanical
Gearbox Ratio & Output Torque Calculator
Calculate output speed and torque across gear reductions while accounting for efficiency.
Robotics
Slope Climbing Calculator
Estimate climb capability on inclines from torque, wheel geometry, mass, and slope angle.
Robotic Arm Joint Torque Calculator
Calculate required joint torque for simple robotic arms based on link lengths, masses, and payload.
Mechatronics
Stepper Motor Torque-Speed & Microstepping Tool
Compare stepper torque, speed, and microstepping tradeoffs for motion control decisions.
Power Systems
Battery Pack Sizing & Runtime Estimator
Plan battery capacity, pack configuration, and runtime for robots, drones, and mobile systems.
Aeromodelling
Wing Loading & Wing Cube Loading with Stall Speed
Review wing loading, cube loading, and stall-speed implications for model aircraft performance.
Drones/Aero
Propeller Thrust & Power Estimator
Estimate static thrust and power draw from propeller size, pitch, RPM, and air assumptions.
Embedded/CSE
Data Rate & Bus Utilization Calculator
Check communication bandwidth and utilization across UART, SPI, I2C, and CAN links.
CRC/Checksum Generator for Robot Protocols
Generate and verify checksum values for common robot, controller, and fieldbus payloads.
Embedded/Signal Processing
Sensor Bandwidth & Nyquist Checker
Validate sampling choices against signal frequency and Nyquist limits for sensing workflows.