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AboutMe & Motivations

This is an Arduino library for driving the VL6180X range sensor module with the digispark-tiny board (attiny85 microChip) via I2C protocal.

Basic notes about Atmel Attiny85

The digispark-tiny dev board based on Attiny85 chip is low-cost, most mini-size board that I like to use. digispark-tiny board is also named as "Digispark USB Development Board - Digistump"

Specs:

  • Support for the Arduino IDE 1.0+ (OSX/Win/Linux)
  • Power via USB or External Source - 5v or 7-35v (12v or less recommended, automatic selection)
  • On-board 500ma 5V Regulator
  • Built-in USB
  • 6 I/O Pins (2 are used for USB only if your program actively communicates over USB, otherwise you can use all 6 even if you are programming via USB)
  • 8k Flash Memory (about 6k after bootloader)
  • I2C and SPI (vis USI)
  • PWM on 3 pins (more possible with Software PWM)
  • ADC on 4 pins
  • Power LED and Test/Status LED

However:

  • attiny85 has no hardware Serial, so #include <SPI.h> will not work.
  • #include <Wire.h> looks work here.
  • directly use Serial.begin(); is not supported.

How to use this library

hardware connection:

connect the VL6108X SDA with attiny85(Pin5_of_chip = Pin0 of board) connect the VL6108X SCL with attiny85(Pin7_of_chip = Pin2 of board) power on the VL6108X with 5V

software env I develop this repo

vsCode + platformIO board: digispark-tiny refer to the file platformio.ini for more info.

to use this lib

put the folder "./lib/Tiny_VL6180X" and "./lib/Tiny_I2CDevice" into the /lib/ folder of your proj. #include "Tiny_VL6180X.h" in main.cpp compile, upload and run it.

Dependency tree

The dep tree and developing steps is shown below:

```
Adafruit_VL6180X.h  <-- lib/Tiny_VL6180X/Tiny_VL6180X.h             (finished)
  -- Adafruit_I2CDevice.h  <-- lib/Tiny_I2CDevice/Tiny_I2CDevice.h  (finished)
       >ps: Is the Wire.h compatible with attiny85 here? 
    -- Wire.h <-- tinyWireM.h 
       >ps: Looks like the Wire.h is OK for attiny85. No need to write this.
```

More examples of code

refer to the "Adafruit_VL6180X" Arduino library, and modify the Adafruit into Tiny.

Acknowledgement

This repository is developed by modifying the "Adafruit_VL6180X" Arduino library. Thanks for their contribution!!