Category Archives: Projects

Wearable Wi-Fi Enabled Lanyard

29 Saturday Feb 2020

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This was a fun project. I wanted to build an 8 x 8 matrix LED name tag that I could control with my smart phone. It was to display my name, title, company and business interests all in scrolling text.

Esp-01 lanyard
Wearable Wi-Fi Access Point

The project uses an Esp-01, Adafruit I2C backpack with 8X8 matrix LED and a 3.7 volt lithium ion battery. The code is written in C/C++ using the Arduino development environment and it’s pretty straightforward. The processor acts as a Wi-Fi access point and simple HTTP requests control the output to the 8X8 matrix LED.

Hands Free Kitchen Light (IOT)

25 Saturday Jun 2016

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My new project is a Internet of Things kitchen counter LED light strip. The goal was to implement a 21st century light switch using bright and energy efficient LED lights. This required the replacement the mechanical switch with a hand-motion proximity sensor for on and off. Other features include:

  • ESP-01 microprocessor and web server to control the light – an important maker CPU
  • Motion sensor to turn off the light, when the kitchen is unoccupied for a user defined time interval
  • 12 volt power with MOSFET (Adafruit IRLB8721) switch for the LEDs and a 3.3 volt switching regulator for the system components
  • The user interface was to be a simple Web site for status, clock and system configuration, and remote light control, that could also update the ESP-01’s  EEPROM
  • OLED 128×64 display for system status, debug stuff and Wi-Fi network information

The ESP-01 presents a couple of problems, because it only has two GPIO ports. I needed to use the I2C bus to communicate with the OLED, which used both GPIO. So I decided to use an MCP23008 IC to handle interrupts (INPUT) and to control the MOSFET (OUTPUT). This enabled me to use I2C bus and added 8 more GPIO ports.

I used two two proximity devices on this project. The first is the PIR motion sensor. I really like the Parallax, Inc. PIR Sensor – Rev B, because it can operate on 3.3 volts and has a red LED to indicate detection of motion. The second proximity sensor is the Adafruit, VCNL4010 Proximity/Light sensor. It measures both near proximity and ambient light. The VCNL4010 uses the I2C bus to communicate data and it has a configurable interrupt signal.  I used the MCP23008 to handle both interrupts – PIR and VNCL4010.

IMG_1886

Breadboard prototype

I added a cool on/off switch from Adafruit as the final touch. The Rugged Metal On/Off Switch with Blue LED Ring – 16mm Blue On/Off looks great.

The software features included: (a) NTP time set, (b) AP mode when the ESP-01 could not connect to its predefined SSID/password, (c) defaults in EEPROM, (d) my version of the VNCL4010 library, (e) my MCP23008 library with interrupt handling, and (f)  RESTful interface for the website configuration stuff.

The next step was to fit everything in a small wooden box that I would mount on the wall.

IMG_1908

Beta version in a small wooden box

I had a lot of trouble with the VNCL4010 when it was installed in the box. I need to spend time determining how much of the PCB board needs to be exposed from a hole or mount in the box.  My first attempt blinked on and off after a couple of minutes.

Below is a short video of the light working. I’m planning to move everything to an Adafruit proto-board and finding a smaller box.

Next steps in a couple of weeks.

 

 

Adafruit.IO Prototype

10 Wednesday Feb 2016

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Amazon, Intel, IBM and many other companies have started building Internet of Things platforms and cloud services. These services are exactly what I’ve been looking for as a way to safely and securely gain Internet access to my home automation system. I buy a lot of great products from Adafruit and discovered they have an IOT platform.  Adafruit.IO is a beta version and I started experimenting with their MQTT SDK this week.

My plan was to build a standalone test bed to learn how to publish sensor data to Adafruit.IO and subscribe to switches and triggers. I built the breadboard below with an ESP-1 to handle the MQTT interface and an ATMega328 to process environment sensors and the alarms (flashing LED and loud piezo buzzer).

2016-02-10 07.20.15

Power was one challenge. I needed 3.3 volts for the ESP-1 and the ATMega328 (LM1117).  A 5 volt rail (7805)was needed for the MQ2 and PIR sensors. A 12 volt rail (power supply rated at 1 amp) was needed for the flashing LED and a loud piezo (not shown).

Programming two processors is an added complication but I’ve got the process down and its pretty reliable. The Arduino IDE is not state of the art but its much better than some of the development environments I used to work with in the olden days.

The photo below is my first prototype of a dashboard from Adafruit.IO

AdafruitDashboard1

I’ve created feeds for humidity, temperature and light. The alarm button turns the flashing LED alarm light on and off pretty quickly. I’ll add gas and motion later tonight. I also want to test the trigger capability as well.

Sensors

  • MQ2 gas sensor
  • DHT11 temperature and humidity
  • Photo resistor light
  • PIR motion sensor

That’s it for now and it took me only a couple of days to get it working. The Adafruit.IO forum was also helpful and support was responding almost as fast as I posted questions.

 

Fireplace Mantel Christmas Project

28 Monday Dec 2015

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I created an interactive fireplace decoration using an ATmega328, two 8×8 Matrix LED backpacks, a 128×64 OLED, a piezo buzzer and an IR remote sensor. Basic functions include the following features.

  • 8×8 LED depict snow falling, a flashing light tree and “Merry Christmas” scrolling marque
  • OLED wishes you a Merry Christmas, and has Naughty and Nice lists with names that can change
  • Piezo buzzer plays Jingle Bells
  • IR Remote controls both displays; plays Jingle Bells; and adds people to the Naughty and Nice lists.

I soldered one of the I2C address pads on one of the 8×8 Matrix LED to differentiate displays (0x70 and 0x71). I used an antique wooden glove box as the project box.

Mantel

The video demonstrates the simple functions of this fireplace decoration.

IOT Digital Alarm Clock

23 Friday Oct 2015

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I’ve started work on a new version of my alarm clock. I wanted to add a couple of improvements to the first version which was based on an ATMega328pu processor and NRF24 radio. This version would use an ESP-1 for both communication and standalone configuration. This became the first version of my DIY clock projects. Later versions are based on Raspberry Pis.

IMG_1153

IOT Digital Alarm Clock Breadboard

Hardware features:

  1. ESP8266 ESP-1 Wi-Fi web server
  2. ATMega328pu 8 Mhz Real-time processor
  3. DS1307 real time clock
  4. OLED display user interface (status and controls)
  5. 7-segment LED digital time display
  6. Piezo buzzer and flashing LED for alarm
  7. Photo-resistor to measure room light
  8. I2C bus for communication
  9. 3.3 volt for all components

Software features:

  1. Sync time from NTP at power up
  2. Web form to manually set time
  3. Web form to control alarm clock settings
  4. Star Wars Imperial March alarm sound
  5. ATMega328 handles analog and digital devices

ESP-1 uses I2C to control all components

ESP-1 uses I2C to control all components

The OLED can be hidden and only needed at startup to determine the status of the system and to show the IP address of the device.

ATMega328 handles all analog and digital devices.

ATMega328 handles all analog and digital devices.

A simple web form is used to (a) manually set date and time; (b) set the alarm time; (c) enable the alarm clock and (d) sound a system alarm.

Simple web for served by the ESP-1

Simple web for served by the ESP-1

The video below demonstrates the basic features using the breadboard design.

The next step is to complete the software development and move everything to a protoboard and antique box.

Raspberry Pi Surveillance Project

19 Saturday Sep 2015

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I wanted to add video surveillance to my home automation project, which was a good excuse to add another Raspberry Pi to the project. I’d tried using an ATMega328 with the Pi but found it too cumbersome to write Python code and Arduino ATMega code. It worked with an I2C interface but I wanted something simpler.

The diagram below illustrates the Adafruit photo-board with all of the necessary interfaces to 5 volt and 3.3 volt devices.

Raspberry Pi Interface Board

Raspberry Pi Interface Board

Project Enclosure

Project Enclosure

Features of a Raspberry Pi 2 Surveillance project:

  • Raspberry Pi 2 – REST server (HTTP communication and control)
  • Surveillance – Raspberry Pi camera for video capture
  • Panic Button – hardware debounced button (3.3 volts)
  • Motion sensor – PIR sensor at 5 volts
  • Night Light – large LED at 3.3 volts
  • Identification – IR Sensor to check for “me”
  • iBeacon sensor – BLE USB dongle checking for my iPhone iBeacon
  • Alarm – 555 Timer driving a loud speaker

I enclosed the project in a plain wooden box. As you can see the cable management was a hassle with the hinge and external interfaces on the door.

Raspberry Pi Surviellance

Raspberry Pi Surveillance

All of the code is in Python. There are four main packages

  1. REST server code
  2. Hardware interace – interrupts
  3. Camera controls with 2 rotating JPEG images
  4. BLE iBeacon scanner

I will publish the code to GitHub when I get a chance.

ESP Light Switch – Part II

19 Saturday Sep 2015

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Continuation of my ESP8266 DC power switch. Once I had the breadboard working I soldered the components onto an Adafruit Proto-Board and enclosed the electronics in an antique wooden box. I’ve been combining the “old” with the “new” by reusing old or antique wooden boxes as my Arduino, Raspberry Pi and ESP8266 projects.

Final Project Enclosure

Final Project Enclosure

The next version (there are always things to improve) will use a 220 Ohm resistor for the LED indicator. I will also add some type of relay for an AC version. I really like the cloths pin box which I found in an antique store in Kalispell, Montana.

ESP8266 Light Switch Design

ESP8266 Light Switch Design

The diagram depicts a modified version (new 220 Ohm resister, etc.) of the proto-board solution. I’ve also added pins to support debugging on the proto-board by providing RX, TX and GND pins from the ESP-1.