Flashlight Dev Board Firmware

Introduction

This repository contains the test firmware for the boost driver found in the hardware repository.

For a detailed explanation of this project, check out the video series on the Engineer Bo YouTube channel.

Features

The test firmware includes a demonstration of the following features:

• Brightness control
  • DAC with dynamic VREF
  • Switching between two current sense resistors a.k.a. high dynamic range (HDR)
  • Smooth brightness ramping from off to maximum brightness
• Power switch click counting
  • Using RC discharge for off-time estimation
  • ATtiny1616 internal EEPROM
• Temperature sensing
  • NTC thermistor
  • ATtiny1616 internal temperature sensor
• Battery level sensing and undervoltage lockout (UVLO)

Usage

This firmware is meant for testing and development, and serves as a reference for anybody interested in learning about flashlight boost drivers. I don't recommend actually using this build.

Instead, have a look at the schematics and source code, and leave me a comment on YouTube if you have any questions.

If you really want to try this firmware out:

1. Acquire the necessary hardware
2. Build the firmware using Microchip Studio
3. Flash the ATtiny1616 via UPDI.
4. Cycle through the demonstration modes:
   • Click 1: Ultra low (minimum brightness)
   • Click 2: Low
   • Click 3: High
   • Click 4: Ultra high (maximum brightness)
   • Click 5: Smooth ramp
   • Further clicks: Cycles back to first mode