MQTT

Using ESP32 to communicate with Xiaomi flora (miflora) plant sensor using BLE and posting the values on MQTT server. I also demonstrate the use of Home Assistant miflora sensor component. Change ESP32 Partition: https://desire.giesecke.tk/index.php/2018/04/20/change-partition-size-arduino-ide/ Home Assistant miflora sensor: https://www.home-assistant.io/components/sensor.miflora/ GitHub: sidddy/flora Archived code from https://github.com/sidddy/flora below config.h // array of different xiaomi flora MAC addresses char* FLORA_DEVICES[] = { "C4:7C:8D:67:11:11", "C4:7C:8D:67:22:22", "C4:7C:8D:67:33:33" }; // sleep between to runs in seconds #define SLEEP_DURATION 30 * 60 // emergency hibernate countdown in seconds #define EMERGENCY_HIBERNATE 3 * 60 // how often should the battery be read - in run count #define BATTERY_INTERVAL 6 // how often should a device be retried in a run when something fails #define RETRY 3 const char* WIFI_SSID = "ssid"; const char* WIFI_PASSWORD = "password"; // MQTT topic gets defined by "<MQTT_BASE_TOPIC>/<MAC_ADDRESS>/<property>" // where MAC_ADDRESS is one of the values from FLORA_DEVICES array // property is either temperature, moisture, conductivity, light or battery const char* MQTT_HOST = "10....

An attempt to build a Amazon “Dash” type button to communicate with Home Assistant, which is a combination of two different projects GitHub: debsahu/TheButton Things we want to achieve: Low on power consumtion: ESP8266 is OFF when the button is not pressed debsahu/ESP_External_Interrupt Portable: Uses 18650 battery, lasts years Talks to Home Assistant: debsahu/HARestAPI ESP_External_Interrupt GitHub: https://github.com/debsahu/ESP_External_Interrupt HARestAPI GitHub: https://github.com/debsahu/HARestAPI

Let’s build a security camera using Raspberry Pi Zero W and Movidius Neural Compute Stick to recognize a “person” on the video stream GitHub: debsahu/PiCamMovidius Set up NCSDK API Install required packages on Pi sudo apt-get install -y libusb-1.0-0-dev libprotobuf-dev libleveldb-dev libsnappy-dev libopencv-dev libhdf5-serial-dev protobuf-compiler libatlas-base-dev git automake byacc lsb-release cmake libgflags-dev libgoogle-glog-dev liblmdb-dev swig3.0 graphviz libxslt-dev libxml2-dev gfortran python3-dev python-pip python3-pip python3-setuptools python3-markdown python3-pillow python3-yaml python3-pygraphviz python3-h5py python3-nose python3-lxml python3-matplotlib python3-numpy python3-protobuf python3-dateutil python3-skimage python3-scipy python3-six python3-networkx python3-tk libboost-python-dev Clone NCSDK cd ~ git clone https://github....

Wouldn’t be cool for many McLighting (RGB LED lighting using NeoPixels) to talk to each other and synchronize? Here is my naive attempt at this, which requires McLighting to be served as stand-alone web-client. MeshyMcLighting What is this? Wouldn’t be cool for many McLighting to talk to each other and synchronize? Here is my naive attempt at this, which requires McLighting to be served as stand-alone webclient. Features Uses painlessMesh to create mesh network and broadcasts state to every node Does not need WiFi connection to internet, standalone mode + mesh Web interface is borrowed from “WS2812FX esp8266” example, completely served on ESP8266 Can do minimal file upload to SPIFFs Completely Async!...

An attempt to use RTL-SDR to read values from wireless electric/gas/water meters and visualize these values on Home Assistant. Software Based on bemasher/RTLAMR Project: https://github.com/bemasher/rtlamr

Idea: Use ESP8266 to talk to Twitter Get User Data or Tweet or Search Twitter Display the data on a Dot-Matrix display Implementation I created an Arduino library to talk to Twitter using its Web API made for ESP8266. There are other approaches like using a bearer token arduino-twitter-api, but comes with limitations in terms of not being able to send tweet. This Arduino library TwitterWebAPI can both search/read and post tweets....

Have you wondered how to build a internet connected smoke alarm using ESP8266 and a cheap Kidde RF-SM-DC? Overall idea is to detect smoke alarm signals and send MQTT message. Home Assistant reads the MQTT message and sends out notifications that can be used to notify your local fire station. ESP8266 sends a MQTT message until the smoke alarm is beeping. Software Refer to https://github.com/debsahu/ESP_External_Interrupt to build the ESP8266 part of the internet connected smoke alarm....

Have you ever wondered how to turn on ESP8266 using external interrupt? Build a battery powered amazon dash button or a 18650 lipo powered door bell using ESP8266 without putting the device in deep sleep? Here is your answer. Idea Keep ESP8266 on OFF mode as default External 3.3V signal (can be short or long) arrives and turns ON ESP8266 ESP8266 wakes up and keeps itself awake until a task is perfomed Send MQTT data to server Put ESP8266 back to power OFF state Implementation RST pin is always HIGH/3....

Wouldn’t it be nice to know if your dog’s water bowl is empty? Let us build a sensor that measures the water level every 5 minutes. This value is sent to MQTT server and Home Assistant automation takes care of the rest. This sensor connects to MQTT and Home Assistant. See dogsensor.yaml for adding this to HA. Assumes that one has set up various notification sensors available in HA....

Let’s say that you don’t have your smartphone around and someone mentions you on twitter. Wouldn’t it be nice to have a display that automatically reads your twitter mentions and show it on a scrolling display? So let’s build a internet controlled (IoT) dot-matrix display that does this for us using an ESP8266. The plan to accomplish this is as follows: Someone mentions us on twitter (in my case @debsahu) IF This Then That (IFTTT) tracks these mentions and posts this data on Adafruit....