All items tagged with MQTT (16)

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Wemos Lolin = ESP32 + OLED on one board

February 14, 2019 by Jens Nickel

Wemos Lolin = ESP32 + OLED on one board

You can use simple LED indicators to show the status of an application you are developing using an IoT board but you can convey so much more information when the dev board has the luxury of a built-in display. Check out this low-cost ESP32 development board with built-in OLED display available now from the Elektor Store.

My Journey into the Cloud (25): ESP32 and Amazon Web Services – send data to the Cloud securely

May 17, 2018 by Jens Nickel

My Journey into the Cloud (25): ESP32 and Amazon Web Services – send data to the Cloud securely

Many of the IoT solutions you see at trade shows like Embedded World use Amazon Web Services (AWS). This platform is very powerful, robust and secure and therefore has become a kind of 'industry standard'. Amazon has developed 'AWS IoT Core' specifically for Internet of Things applications. If, like me you just want to try it out you can get a free quota of 500,000 messages for a period of 12 months...

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My Journey into the Cloud (24): The ESP32 controls remote processes

April 11, 2018 by Jens Nickel

My Journey into the Cloud (24): The ESP32 controls remote processes

In the last installment we built a small stand-alone device using the ESP32 Pico Kit, an RGB LED and an LDR, which we used to measure the ambient brightness level and send them to a Cloud platform. We can also send commands from the Cloud platform to control all sorts of actuators connected to our device...

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My Journey into the Cloud (23): Sensor values sent to Cloud using an ESP32 Pico kit

March 7, 2018 by Jens Nickel

My Journey into the Cloud (23): Sensor values sent to Cloud using an ESP32 Pico kit

In the last installment, we built a small device using the ESP32 DevKitC, an RGB LED and a light-dependant resistor (LDR). This device periodically measures the ambient brightness level and sends this value to the AllThingsTalk cloud platform where the values are displayed on a user-configurable web page. Now we make the communications more robust.

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My Journey into the Cloud (22): ESP32 sensor node with web server

January 31, 2018 by Jens Nickel

My Journey into the Cloud (22): ESP32 sensor node with web server

In previous parts of this series we saw how to use a web page on a local network to configure an IoT device. In this part, we use a web page to configure a cloud access that allows us to send sensor values. These can then be accessed and viewed from anywhere in the world.

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My Journey into the Cloud (18): AllThingsTalk allows visualization of measurements in the Cloud

September 7, 2017 by Jens Nickel

My Journey into the Cloud (18): AllThingsTalk allows visualization of measurements in the Cloud

In this series we have developed MQTT clients able to send messages back and forth over the internet. With the summer break behind us we take a giant leap and use a platform which allows us to store and visualize data in the Cloud. For this we use the AllThingsTalk portal...

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My journey into the Cloud (16) automatic reconnect

June 1, 2017 by Jens Nickel

My journey into the Cloud (16) automatic reconnect

In the last installment, we implemented a small actuator project where we are able to switch a remote LED using MQTT. Now and then the link is interrupted, here we show how we can automatically re-establish the link. All the Arduino functions are available from the last installment...

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My Journey into the Cloud (15): Actuator board with the ESP8266

April 20, 2017 by Jens Nickel

My Journey into the Cloud (15): Actuator board with the ESP8266

In the last installment of this series, we developed a small sensor node based on the Pretzel board (equipped with an ATmega and ESP8266 WiFi chip), which transmits measurement values via MQTT to the Internet. In this installment we take a closer look at the other end of the control chain to operate an actuator and find out about the MQTT ping mechanism...

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Build an MQTT-based IoT network

March 7, 2017 by Clemens Valens

Build an MQTT-based IoT network

MQTT (Message Queue Telemetry Transport) is a publish-subscribe-based (one-to-one or one-to-many) messaging protocol oriented to communication with sensors. MQTT architecture follows a star topology with one or more clients or nodes, and a central server — the broker — responsible of managing the network and relaying messages. This project describes an ESP8266-based adapter that allows any electronic device having a serial port to become an MQTT node connected to a Wi-Fi IoT network. A broker is built with a Raspberry Pi.

My Journey into the Cloud (11); Pretzel board works as a Wi-Fi Dongle

September 25, 2016 by Jens Nickel

My Journey into the Cloud (11); Pretzel board works as a Wi-Fi Dongle

In the last installment of this series I started with the Pretzel-Board which has an ATmega328 and a WiFi LAN ESP8266 chip on board. The pretzel board was just hooked up to a PC using a USB cable and with a terminal emulator program running on the PC, I am able to send simple text-based commands to the ESP8266 WiFi module via the ATmega328. Now we carry on and use MQTT.

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