Things used in this project

Hardware components:
12757 01
SparkFun RedBoard
SparkFun OpenSegment Shield
7-Segment Display - 20mm (Blue)
Wall Charger - 5V USB (1A)
USB Mini-B Cable - 6 Foot
Alcohol Gas Sensor - MQ-3
SparkFun Gas Sensor Breakout Board
Break Away Headers - Straight
Hook-up Wire - White (22 AWG)
ProtoBoard - Square 1" Single Sided
Arduino Stackable Header Kit
Resistor 4.7k Ω
Hand tools and fabrication machines:
Soldering Station


DIY Breathalyzer
Diy breathalyzer


Download ZIP and upload BAC_Display.ino to the Arduino!


Engineering superhero
Shawn hymel

Engineering Superhero at SparkFun Electronics.


Did you replicate this project? Share it!

I made one

Love this project? Think it could be improved? Tell us what you think!

Give feedback


Similar projects you might like

The composting friend
  • 537
  • 33

Full instructions

Our goal is to make composting easier to use and to maintain.

Automatic Fear 1.0
  • 198
  • 5

Full instructions

A device capable of frightening my sister and with compatibility with other members of the family

Theremino Adapter for CNC.
  • 246
  • 7

Full instructions

Attention: This adapter is used to replace the parallel port with the USB, and not to operate Mach3 CNC or Linux.

Theremino Logger
  • 134
  • 4

Datalogger is simple to use but with great performance. The base, concise and intuitive.

Smart Sump Pump Monitor
  • 791
  • 10

Full instructions

Sump pump monitor has live dashboard for usage statistics, and data logging. Email notifications through Particle Cloud or IFTTT.

Smart Home 433MHz RF <-> MQTT Gateway With Some Extras
  • 674
  • 3

Full instructions

Control your RF devices via MQTT and integrate them into your smart home 🏡, using the WEMOS ESP8266 connected to MQTT service via WiFi.

ProjectsCommunitiesContestsLiveAppsBetaFree StoreBlogAdd projectSign up / Login
Respect project