How to Make Multi Pattern Bike Indicator KTM Style


Bicycles are a great mode of transportation, and as with any other vehicle, it’s important to have proper indicators to ensure the safety of the rider on the road. The traditional wired bike indicator systems can be bulky and can be difficult to install. However, with the advancements in technology and the availability of microcontrollers, making a multi-pattern bike indicator has become much easier. In this article, we will be discussing how to make a Multi-Pattern Bike Indicator using ATTINY85 microcontroller, a versatile and cost-effective microcontroller.

ATTINY85 microcontroller

The ATTINY85 is a microcontroller that is part of the AVR family. It’s a low-power 8-bit microcontroller that comes with 8K bytes of in-system program memory (FLASH), 512 bytes of EEPROM, and 512 bytes of SRAM. It has one 8-bit timer/counter with PWM and two 16-bit timers/counters with PWM. It also has six I/O pins that can be used as digital I/O or ADC inputs. The ATTINY85 is a great choice for low-power projects as it can operate with a voltage range of 1.8V to 5.5V. It’s also cost-effective and is widely available at electronic stores.

How to Make Multi Pattern Bike Indicator KTM Style
Multi Pattern Bike Indicator KTM Style

Circuit Diagram of Multi Pattern Bike Indicator

This project can be designed using a few basic components. The circuit diagram of this project is shown below.

How to Make Multi Pattern Bike Indicator Circuit Diagram
Multi Pattern Bike Indicator Circuit Diagram

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Components List of Multi Pattern Bike Indicator

Following is the list of all components used in this project:

  • 1 X ATTINY85
  • 1X 7805 Regulator
  • 2X BC547 Transistors
  • 2X 1N4148 Diodes
  • 2X LEDs
  • 5X 1k Resistors
  • 3X 10K Resistors
  • 1x 0.1uF Capacitor
  • 1X 10uF Capacitor
  • 1X 47uF Capacitor
  • 2x 12V Relays
  • 2x 2 Pin Terminal Blocks
  • 2x 3 Pin Terminal Block

Project Code Zip File:

Explanation of Multi Pattern Bike Indicator

Building the Project

Gather all the Components Required for Making Multi Pattern Bike Indicator. The complete list of material is provided above.

Step 1: Solder the PCB Board

Before starting to wire the components together, you’ll need to solder the PCB board. The PCB board acts as a base for all of the components to be mounted on and ensures that the circuit is neat and organized.

Step 2: Connect the ATTINY85 microcontroller and Adafruit Trinket USB

Next, you’ll need to connect the ATTINY85 microcontroller and the Adafruit Trinket USB to the PCB board. The Adafruit Trinket USB acts as a programmer that allows you to program the ATTINY85 microcontroller. You’ll need to use jumper wires to connect the pins on the microcontroller and the Adafruit Trinket USB together.

Step 3: Connect the LEDs

The LEDs are the main components of the bike indicator. You’ll need to connect the RGB LEDs to the PCB board using jumper wires. You’ll also need to connect each LED to a transistor and a diode. The transistors help to amplify the current while the diodes protect the LEDs from reverse voltage.

Step 4: Connect the ON-OFF Switch

To turn on and off the indicator, you’ll need to add an ON-OFF switch. Connect the switch to the PCB board so that you can easily switch the circuit on and off.

Step 5: Code the Microcontroller

The final step is to code the microcontroller. The code tells the microcontroller how to control the LEDs and what patterns to use for the indicator. You can find the code for the multi-pattern bike indicator in the Components List section for download.

Safety Precautions

Before you start assembling the circuit, make sure to follow these safety precautions:

  • Always work in a well-lit and ventilated area.
  • Wear safety glasses to protect your eyes from any stray wires or soldering debris.
  • Be careful while handling the soldering equipment as it can get very hot.
  • Avoid working on the circuit while it’s plugged in.


Making a multi pattern bike indicator using ATTINY85 microcontroller is a great project for anyone interested in electronics and cycling safety. The components required for this project are readily available at electronic stores, and the cost is minimal. The ATTINY85 microcontroller is a versatile and cost-effective solution for low-power applications. With this project, you can customize the patterns of the bike indicator to suit your needs while also ensuring your safety on the road. So, what are you waiting for? Grab your components and start building your own multi-pattern bike indicator today!

More projects, You may like:

For more project and circuit diagrams, you can go through the Schematics in the main menu where you can find many interesting projects and circuit diagrams like audio amplifier circuits, voltage booster circuitbattery charger circuit and timer circuits etc., which are all beginner circuit projects. Feel free to check them out!

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