BUILD CARD · EASY
Pushbutton Color Light
A momentary-switch version of manual Project 2 with a protected color LED.
- Time
- 15 min
- Age
- 8+
- Pieces
- 6
- Board
- 10×7
- Build and check a 10×7 snap-grid circuit from a visual diagram.
- A pushbutton controls a color LED while a series resistor limits its current.
02 / PARTS CHECK
Parts list
- 1×7-snap wireconnector
- 1×3-snap wireconnector
- 1×Color LEDsemiconductor
- 1×100 Ω resistorresistor
- 1×Press switchswitch
- 1×3V two-cell battery holderpower
03 / ASSEMBLY
How to build the circuit
- 1
Disconnect the battery and clear the base grid before placing any part.
- 2
Match the final diagram one grid position at a time, placing connecting wires and lower layers first.
- 3
Check the direction of every LED, diode, transistor, battery, and other terminal-sensitive part.
- 4
Press every shared snap firmly, check that no wire shorts the battery, then connect power last.
04 / FIELD NOTES
How it works
The 100 ohm resistor limits LED current.
Pressing the button completes the loop.
The color LED contains internal electronics that change its light.
Explore more led circuit projects →
05 / TEST
Test and expected result
- What to do
- Hold the press switch and watch the color sequence.
- What to expect
- The LED changes color while the resistor limits its current.
06 / SAFETY
Build smart
- Use only the 3V two-cell battery holder.
- Never connect the battery terminals directly together.
- Disconnect the battery before moving any component.
07 / TROUBLESHOOTING
If it does not work
- Press every overlapping snap down firmly.
- Check the battery direction and replace weak batteries.
- Compare every component position with the final diagram.
08 / FREQUENTLY ASKED QUESTIONS
Questions about this circuit
What is the main idea behind this circuit?
A pushbutton controls a color LED while a series resistor limits its current.
What should I check first if it does not work?
Press every overlapping snap down firmly.
09 / RELATED BUILDS
Try a similar circuit
Continue with another build that shares the same components, ideas, or difficulty.
Blue LED Switch Light
Replace the color LED in manual Project 2 with a blue LED and keep the current-limiting resistor.
Magnetic Color Light
Bring a magnet near the reed switch to power the color LED safely.
Tap-Triggered Blinking LED
Tap the board to energize a blinking LED through a vibration switch.