Free UoM / Katubedda pickup · Island-wide delivery · Bank transfer or cash at pickup

ProtoCircuit
Get project help

ProtoCircuit · Sri Lanka

Components for people who build things.

Development boards, sensors, modules and tools with real support, fast local delivery and help choosing parts that work together.

Shop components Get project help
Exploded view of a development board with a sensor module, motor driver, display, micro servo and jumper wires connected around it.

Current inventory

Choose by the specification that matters: voltage, interface, current or package.

View all parts

Find the right starting point

Explore our core categories of electronic components and build with confidence.

View all categories
Development BoardsMicrocontrollers, SBCs, FPGA and IoT boards for building projects and prototypes.SensorsMeasure, detect and sense the world around you.RoboticsMotion control, actuators and mechanical parts for intelligent machines.PowerModules, converters and supplies to power your projects.ToolsEssential tools and equipment for building and debugging.KitsCurated kits to learn, build and bring your ideas to life.

Parts assistant

Describe your build. Proto specs the parts.

Tell Proto what the finished project needs to do. It asks about power, size and environment, then hands back a starting parts list from our range. Add the whole list to the cart, or open any part on its own.

Proto is a design prototype. It is not connected to an AI service and its replies are scripted.

How do I pay?
By bank transfer for island-wide delivery. For a free UoM / Katubedda pickup, pay in cash when you collect or by bank transfer. No card details are collected.
Where do you deliver?
Island-wide across Sri Lanka by courier. The courier fee is paid in cash when the parcel arrives; checkout shows the current range.
Is the stock real?
Yes. Every part shows its live count, straight from our own inventory.
Need a human?
Email hello@protocircuit.lk. We answer part-choice questions directly.

Build  •  Learn  •  Share

Project kits

Build paths with the parts, guides and starting points to take you from first connection to a working build.

Kit 01

Line-following robot

Build an autonomous robot that follows a line using infrared sensors and closed-loop motor control.

  • IR line sensors for track detection
  • Dual motor control for the chassis
  • Controller board ready for example code
  • Rechargeable power and mounting hardware
Plan a similar build
Illustration of a line-following robot build travelling along a marked track
MCU board
IR sensor array
DC motor (×2)
Wheel (×2)
Battery pack
Chassis plate

Kit 02

Sensor station for classrooms

Collect and visualize real-world data with modular sensors and a simple display interface.

Illustration of a classroom sensor station build
TemperatureHumidityLightPressureDisplay
Plan a similar build

Kit 03

IoT starter build

Connect, publish, and monitor data from anywhere with a Wi-Fi microcontroller.

Illustration of a connected IoT build
ConnectivityData flowLocal loggingAlerts
Plan a similar build

Technical guides

Useful knowledge for the next decision.

Practical notes that support component selection and project planning.

Bench power supply connected to a development board with multimeter probes and connector options

Choosing a power supply for your prototype

Match voltage, current, and connector requirements before power reaches the bench.

Sensor module wired to a development board with clearly grouped signal connections

Reading a sensor module pinout

Turn a pinout into working connections by identifying power, ground, and signals.

Motor driver module beside a geared motor, heatsink and multimeter probe

Motor drivers: current, voltage and heat

Read the important limits before pairing a motor with its driver and power source.