Mini Space Rover
A solar-assisted rover.
Manual variant
STEM kit · Control circuits
Traffic Signal
Build a working traffic-light model and explore manual and automatic electronic control.
₹250
Batteries not included
About 15 g of parts recovered from discarded electronics get a second life in every kit. (Estimate)
A hands-on traffic signal model operated manually to demonstrate basic circuits and switching.
An automatically sequenced traffic signal using a simple timer and counter circuit.
Price excludes delivery. Ships from Ambattur, Tamil Nadu. India Post delivery (Normal or Express) is calculated at checkout from your PIN code.
Batteries are not included with ReSpark kits. New AA cells may be required for operation. Salvaged battery cells are never included.
Manual or automatic?
Two ways to control the same signal.
| Manual — ₹250 | Automatic — ₹299 | |
|---|---|---|
| How the lights change | By hand, using the switch | Automatically, in sequence |
| Control circuit | Switch on a breadboard / simple circuit, with a 220 Ω resistor for each LED | 555 timer and CD4017 counter on a breadboard, with suitable resistors |
| Concepts | Basic circuits, switching, LEDs | Timing, counting and sequencing, LEDs, resistors |
| Shared parts | LEDs, wires, casing, pole and cardboard base | |
The automatic sequence comes from a new 555 timer and CD4017 counter that students build on a breadboard. No salvaged circuit board controls the lights.
What’s in the kit · Manual
Recovered where suitable. New where it matters.
ReSpark combines suitable recovered components with selected new components to create affordable, safe and reliable STEM kits.
Recovered / reused
Recovered / Reused Components
Components that can safely be recovered from suitable discarded electronics after inspection and testing.
- LEDsRecovered from suitable old devices
- WiresRecovered from discarded devices
- CasingA suitable reused casing for the signal head
- PoleReused plastic or metal pole
- BaseReused cardboard base
New
New Components
Components intentionally purchased new because they are inexpensive, safety-critical, difficult to recover reliably, or unsuitable for reuse.
- SwitchOperates the lights by handTurns the circuit on and off
- Breadboard / simple circuitThe circuit students build and test
- 220 Ω resistors (×3)One per LED, to limit the current and protect it
- 555 timerProduces the timing pulses
- CD4017 counterSteps through the lights in sequence
- Suitable resistorsFor the timer and LED circuits
Not included: batteries. New AA cells may be required for operation.
Keep building
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