Bosch Sensortec developed the BMP280 as a barometric pressure sensor. It’s designed with high accuracy and precision to measure atmospheric pressure and temperature. The sensor is commonly used in various applications such as weather stations, altitude measurement, indoor navigation, and IoT (Internet of Things) devices.
The BMP280 sensor utilizes a MEMS (Micro-Electro-Mechanical Systems) pressure sensor to detect atmospheric pressure changes. Additionally, an integrated temperature sensor provides temperature measurements. These measurements enable the calculation of altitude and provide data for weather forecasting, environmental monitoring, and other applications.
This sensor communicates with microcontrollers or other devices via standard interfaces like I2C (Inter-Integrated Circuit) or SPI (Serial Peripheral Interface). Consequently, it’s easy to integrate into a wide range of electronic systems.
Where Buy this Sensor
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Data Sheet
BMP280 Pressure Sensor
Suggest to study
ESP8266 NodeMCU – Pressure Measurement using BMP280 Sensor
Uses
The BMP280 sensor finds applications in various fields due to its ability to measure barometric pressure and temperature accurately. Consequently, here are some common uses:
Weather Stations: These stations often employ this sensor to monitor atmospheric pressure and temperature, providing data for weather forecasting and analysis.
Altitude Measurement: Altimeters use it to determine altitude above sea level by measuring changes in atmospheric pressure with elevation.
Indoor Navigation: In combination with other sensors, this device contributes to indoor navigation systems by providing altitude and temperature data for positioning and orientation.
Drones and UAVs: These unmanned aerial vehicles (UAVs) use the BMP280 for altitude control and navigation, enabling precise altitude hold and flight stabilization.
Environmental Monitoring: Environmental monitoring systems use the sensor to measure atmospheric conditions in indoor and outdoor environments, including air quality assessment and pollution monitoring.
IoT (Internet of Things) Devices: Various applications integrate the BMP280 into IoT devices, including smart home automation, agricultural monitoring, and industrial control systems.
Automotive Applications: In automotive applications, the BMP280 can monitor cabin pressure, compensate for altitude in navigation systems, and control climate.
In this article we are discussing Embedded Interface – PCF8574 and PCF8574A I/O Expender.
The PCF8574 device provides general-purpose remote I/O expansion for most micro controllers families by way of the I2C interface [serial clock(SCL), serial data (SDA)]. 8-bit 2.5- to 5.5-V I2C/SMBus I/O expander with interrupt
The device features an 8-bit quasi-bidirectional I/O port (P0–P7), including latched outputs with high current drive capability for directly driving LEDs. Each quasi-bidirectional I/O can be used as an input or output without the use of a data-direction control signal. At power on, the I/Os are high. In this mode, only a current source to VCC is active.
UART (Universal Asynchronous Receiver/Transmitter) is a standard communication protocol used for serial communication between devices. It’s commonly employed in embedded systems for communication between microcontrollers, sensors, and other peripheral devices.
In the context of embedded systems, UART is often used as a hardware communication protocol, enabling devices to transmit and receive data serially. The UART communication involves two pins: TX (transmit) and RX (receive).
It’s is full-duplex communication
UART contains a shift register
which is the fundamental method of conversion between serial and parallel forms.
Type of Communication: Asynchronous (No clock).
Rule: The transmitter and receiver should same baud rate. Data format and transmission speed are configurable.
UART Uses serial communication over a computer or peripheral device serial port. (Electronics Devices).
SPI is an abbreviation for Serial Peripheral Interface, which stands for Synchronous Serial Communication Interface. It is utilized for short-distance communication and was developed by Motorola in 1980, later becoming a de facto standard. SPI communication operates in full-duplex mode. It is also sometimes referred to as the Four-Wire Serial Bus (FWSB), distinguishing it from Three, Two, and One Wire Serial Bus protocols. The four-wire protocol includes SCL, SS, MISO, and MOSI. SPI operates as a single master protocol.
Message Queue Telemetry Transport (ISO/IEC PRF 20922), or MQTT, is a lightweight protocol designed for machine-to-machine (M2M) device communication using a Publish/Subscribe pattern. It was developed by Message Queue Telemetry Transport (ISO/IEC PRF 20922) and Lightweight protocol for (M2M) device communication using Publish/Subscribe. It was Developed By Andy Stanford-Clark (IBM) and Arlen Nipper (Eurotech; now Cirrus Link) in 1999. Unlike HTTP, which follows a request/response paradigm, It utilizes a publish/subscribe architecture. The central communication point in It is the Broker. It is available for implementation in C, C++, JavaScript, Lua, Python, and soon in C#.
Client functions
Field
Description
Host
Address of the MQTT broker.
Port
Default: 1883.
ClientID
Unique client identifier.
Username
UTF-8 encoded string for authentication.
Password
Client’s password if flag set.
Keep Alive
Duration client stays connected (seconds).
SSL
Indicates SSL/TLS encryption usage.
Clean Session
If set, session clears subscriptions and messages.
Last-will Topic
Topic for “Last Will” message on disconnect.
Last-will QoS
Quality of Service for “Last Will”.
Last-will Retain
Retain status for “Last Will” message.
Last-will Message
Content of “Last Will” in case of disconnection.
Topic
Message destination hierarchy.
+ Plush sign
Single-level wildcard in subscriptions.
# Hash Sign
Multilevel wildcard in subscriptions.
Publish QoS
Quality of Service levels:
QoS(0) – At most once
QoS(1) – At least once
QoS(2) – Exactly once
Retain
Message retention by broker.
Subscriptions
List of subscribed topics.
Message
Payload data transmitted.
Broker
Server distributing messages.
Client
Device or app connected to broker.
Quality of Service
Message delivery guarantee.
Retained Messages
Broker-stored messages for new subscribers.
Persistent Session
Broker-maintained session after client disconnects.
Last will and Testament and SYS topic
Client’s “Last Will” message and system topics interaction.
DIOT which stands for Decoupled IOT, has its SCADA functionalities decoupled into Host and Node for flexibility and scalability that catered for IoT era. This plugin functions as the SCADA Host to work with your device or system, which will be treated as SCADA Node. You just need to enter the broker/server into the configuration. You may then subscribe to the desired topic with a shortcode to display in any desired web page or post. [diot topic="building/floor/device/sensor"] Or, if you have a JSON content, you may add dollar sign as JSON root: [diot topic="building/floor/device/sensor$json.data"]. The content will be updated dynamically when the device publish any data. You may also choose to display your realtime data in trending chart. Check out Ecava DIOT online demo to see how easy things can be done now! For more see here : https://wordpress.org/plugins/ecava-diot-scada/
Setting up Tthis is easy. Simply supply your MQTT broker’s details and configure which WordPress events should trigger messages. “MQTT is a machine-to-machine (M2M)/”Internet of Things” connectivity protocol. It was designed as an extremely lightweight publish/subscribe messaging transport.” (from mqtt.org) A number of events are predefined. Simply check the right checkbox and fill in the message’s subject and text.
Pageview
User login
Failed user login
Post published
Page published
New comment
Other events can be added using the “custom events” section. This allows you to use any WordPress hook (actions and filters) to trigger messages.
COAP, or Constrained Application Protocol, a specialized web transfer protocol, is designed for constrained devices and low-power, low-bandwidth networks commonly found in Internet of Things (IoT) and Machine-to-Machine (M2M) applications. CoAP is an application layer protocol similar to HTTP but optimized for constrained environments.
This, designed to be simple and lightweight, is ideal for resource-constrained devices, operating over UDP instead of TCP to reduce complexity. It supports request/response interactions like HTTP and offers features such as multicast support and resource discovery. CoAP facilitates efficient communication between constrained devices and web servers, fostering the development of scalable IoT solutions.
Getting Started with Terminal by Br@y tool
Terminal is a simple serial port(COM) terminal emulation program
Used for communication with different devices (Modem, routers, embedded uC systems, GSM Phones. GPS Modules)
Very useful debugging tool for serial communication applications
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