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Introduction to the MQTT Protocol on NodeMCU

Introduction to the MQTT Protocol on NodeMCU

MQ Telemetry Transport (MQTT) is a popular low-overhead messaging protocol used by many IoT devices to communicate. This tutorial will show the user how to to set up a basic MQTT network using Python on his or her computer and an ESP8266 running the NodeMCU firmware.


Projects Sep 15, 2015 by Patrick Lloyd
BLE using nRF51: ARM-GCC Build Environment

BLE using nRF51: ARM-GCC Build Environment

How to set up the build environment for the nRF51 system-on-chip using makefiles and ARM-GCC.


EFM8 Sound Synthesizer: Driving the Speaker

EFM8 Sound Synthesizer: Driving the Speaker

Part 2 in the “How to Make an EFM8-Based Sound Synthesizer” series.


Projects Sep 11, 2015 by Robert Keim
EFM8 Sound Synthesizer: From Square Wave to Sine Wave

EFM8 Sound Synthesizer: From Square Wave to Sine Wave

Part 1 in the “How to Make an EFM8-Based Sound Synthesizer” series, which will design a sound synthesizer that can play standard musical notes. We will accomplish this using a low-cost, small-form-factor EFM8 microcontroller in conjunction with a few external components and a speaker.


Projects Sep 04, 2015 by Robert Keim
Ambient Light Monitor: Using a Triac to Adjust Lamp Brightness

Ambient Light Monitor: Using a Triac to Adjust Lamp Brightness

Part 5 in the “How to Make an Ambient Light Monitor” series.


Projects Sep 01, 2015 by Robert Keim
An Introduction to the Wunderbar

An Introduction to the Wunderbar

Learn how to set up the Wunderbar platform to begin building your own IoT apps. This will demonstrate the "Can't Touch This" and "Tell Me When" demo applications to measure WunderBar sensors and perform actions based on them. Some of the major bugs are discussed.


Projects Aug 29, 2015 by Patrick Lloyd
Getting Started with PSoC®

Getting Started with PSoC®

Getting started with PSoC®, the Programmable-System-on-Chip by Cypress Semiconductor for developing and testing embedded systems.


Make an Automatic Water Softener Reporter

Make an Automatic Water Softener Reporter

Create a smart home by displaying the current salt level of your water softener with the CC3200 and a proximity sensor.


How to Use the Digital I/O on a BeagleBone

How to Use the Digital I/O on a BeagleBone

Beaglebone Black is the most recent incarnation of the Beaglebone open source hardware platform. For less than $50, the board includes Ethernet, graphics processing, 4Gb of nonvolatile storage, and ports supporting USB, HDMI, and Beaglebone's custom I/O add-ons, called "capes". Here's how to run some simple commands to toggle digital I/O on the board!


Projects Aug 17, 2015 by Nash Reilly
Ambient Light Monitor: Zero-Cross Detection

Ambient Light Monitor: Zero-Cross Detection

Part 4 in the “How to Make an Ambient Light Monitor” series


Projects Aug 16, 2015 by Robert Keim
How to Use MAX232 to Communicate Between a PIC and a PC

How to Use MAX232 to Communicate Between a PIC and a PC

This is one simple way to control a LED, fan, relay or solenoid with a computer and a PIC.


Build an Audio Detector

Build an Audio Detector

Detect audio with an electret microphone and a TI CC3200 Wifi microcontroller. This handy project will allow you to set up an audio detection device that can be used to catch your roommate stealing things from the fridge or send you an alert if the noise in your room goes above a certain threshold.


How to Use a DHT11 with a PIC16F628A and LCD

How to Use a DHT11 with a PIC16F628A and LCD

How to read humidity and temperature from a DHT11 and display it on a LCD with a PIC microcontroller. In this example we're going to use a PIC16F628A.


Ambient Light Monitor: Understanding and Implementing the ADC

Ambient Light Monitor: Understanding and Implementing the ADC

Part 2 in the "How to Make an Ambient Light Monitor" Series. Our smart ambient light monitor will need to digitize and analyze signals from an optical detector, so it is time to explore the EFM8’s integrated analog-to-digital conversion functionality.


Projects Aug 05, 2015 by Robert Keim
Ambient Light Monitor: Measuring and Interpreting Ambient Light Levels

Ambient Light Monitor: Measuring and Interpreting Ambient Light Levels

Part 3 in the “How to Make an Ambient Light Monitor” series. The project continues by building an ambient light sensor circuit on a breadboard, digitizing the circuit’s output signals, and interpreting the digitized measurements.


Projects Aug 05, 2015 by Robert Keim
Transmit Temperature with Raspberry Pi

Transmit Temperature with Raspberry Pi

How to interface a Raspberry Pi to an I2C temperature sensor (TMP102) and then publish the data to a Google sheet and graph.


Ambient Light Monitor: Display Measurements on an LCD

Ambient Light Monitor: Display Measurements on an LCD

Learn how to use an EFM8 microcontroller to convert current and voltage measurements to digits that can be displayed on an LCD. We'll discuss a convenient way to report analog-to-digital conversion values that represent current and voltage amplitudes.


Projects Jul 26, 2015 by Robert Keim
How to Display an Image on an LCD using an EFM8 Microcontroller

How to Display an Image on an LCD using an EFM8 Microcontroller

Use the EFM8’s USB functionality to transfer an image from your PC to an LCD.


Projects Jul 24, 2015 by Robert Keim
How to Make an Interactive TCP Server with NodeMCU on the ESP8266

How to Make an Interactive TCP Server with NodeMCU on the ESP8266

Learn how to connect your device with Linux Screen using the built-in Lua interpreter to set up the file system and connect to the network. Then, learn how to automate the scripting process with Luatool and put it all together with a basic TCP server that can interact with a pulse-width modulated LED, a potentiometer, and a switch.


Projects Jul 22, 2015 by Patrick Lloyd
Guts of the IoT: Building NodeMCU from Source for the ESP8266

Guts of the IoT: Building NodeMCU from Source for the ESP8266

Compile and install NodeMCU on the ESP8266 IoT chip using Linux tools and the ESP Open Source SDK


Projects Jul 18, 2015 by Patrick Lloyd