Strav's blog

Here are a number of links related to Arduino Deep Sleep.

Wemos D1 mini - sleep?
Making the ESP8266 Low-Powered With Deep Sleep
Put your Arduino to Sleep (using wake up INTERRUPT)
Wakeup From Sleep With a Timer (ESP32 + Arduino series)
ESP32 Secrets: Interrupts, and Deep-Sleep under the Hood
Max deep sleep for ESP8266
WeMos D1 mini (esp8266) deep sleep mode
WeMos D1 mini (esp8266), the three type of sleep mode to manage energy savings – Part 4
Arduino OTA and deep sleep
IoT Device with Deep Sleep example (Arduino code)
Deep sleep in Arduino

Here is an article on setting up the Initial configuration after flashing a device with Tasmota firmware.

Tasmota Initial Configuration

Here are a number of posts about the Arduino esp8266 and MQTT.

ESP8266: Connecting to MQTT broker
How To Use Basic MQTT on Arduino
How to use ArduinoJson with PubSubClient
Callback function and MQTT Arduino client
Strings, bytes, char arrays MQTT arghgh
What is the best MQTT Client for Pub and Sub?

On a related note - this discusses converting byte* to char[]

Is it possible to convert a byte* to char[]?
convert byte array into string

A number of links for Arduno:

Control High Voltage Devices – Arduino Relay Tutorial
Automatic Pool Fill Control
eTape Liquid Level Sensor on MCP3008

How to control your TV with an Arduino!

Moving from prototype to permanent:

How do I go from arduino breadboard to creating a real device
From Schematic to Veroboard

Coding Information

How do you reset millis() ?
Blink Without Delay
Arduino Timers and Counters
Arduino Based Countdown Timer

I purchased a number of micro-usb plugs (Uxcell a15061700ux0139) from Amazon to power up my arduinos.  Unfortunately they didn't have a pinout with them.  The linkback has the full document that I was able to find (thank you Jason Fox).  For quick reference, here are the diagrams that he posted: