Electronic Kits -> Educational Kits -> 555 / 4017 Experiment Board

555 / 4017 Experiment Board

February 24th 2016

A combination of a 555 timer IC and a 4017 counter/divider IC on the same board, connected to 10 LEDs. A great way to learn about both chips.
The 555 timer IC is configured in astable mode, the speed of its oscillation is controlled by 2 resistors and a capacitor. The 555's output is fed in to a 4017 counter IC. The 4017's 10 outputs light up in turn with each clock pulse - the faster the clock pulses (from the 555) the faster the LED sweep.
This is a great way to learn about the 555 timer, the 4017 counter, LEDs, resistors, and for more advanced users it can be hooked up to an oscilloscope, the clock frequency probed and recorded.
By using a temperature (thermistor) or light sensor (LDR) in place of one of the resistors, the speed of LED sweeping can be controlled by light or heat.
The 555 timer, in astable and monostable mode, appears in edexcel's GCSE D&T Electronic Products (2EP01) course, and AQA's GCSE Electronics (443) and A-level Electronics (2430) courses.
The 4017 also appears in AQA's GCSE Electronics (443) course.
Usage Suggestions
An idea educational, and fun, classroom project; great lighting feature for your desk (replace one of the resistors with a light or temperature sensor for a light/temperature controlled light show!).
Download the latest build instructions here (PDF).


  • Useful prototyping and testing breakout board
  • 555 timer IC
  • 4017 decade counter
  • Slots directly in to any 2.54mm/0.1" breadboard

Kit Contents

  • High quality printed circuit board (PCB)
  • 1x 555 timer IC (datasheet)
  • 1x 4017 decade counter (datasheet)
  • 1x 16 pin DIL socket
  • 1x 8 pin DIL socket
  • 2x 0.1uf capacitor
  • 1x 1N4001 diode
  • 10x 5mm LEDs
  • 10x 330 ohm resistors
  • 1x 6 pin female header (for capacitor C, and resistor R1/R2)
  • 1x battery clip
  • 1x 3xAA battery box





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