LEAP#343 ESP8266 DHT11 Sensor Reading
The DHT11 sensor is a very cheap and common sensor that provides readings of relative humidity (20-80% ±5%) and temperature (0-50°C ±2°C).
I’ve used this before with an Arduino, this time I’m testing with the most basic ESP8266 board - an ESP-01, which exposes one free GPIO. For coding I’m using ESP8266 core with the Arduino IDE, and the Adafruit sensor library to interface with the DHT11.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#342 ESP8266 Morse Blinky
A quick test of the ESP8266 core for Arduino, which brings support for ESP8266 chip to the Arduino IDE.
That means being able to write C++ sketches for the ESP8266 as easy as developing for an Arduino.
Here I’m using the most basic ESP8266 board (an ESP-01) with a sketch that blinks Morse code on the built-in LED.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#341 USB Power Supply
I’ve taken apart and had enough “wall wart” power supplies blow up on me .. so perhaps it is about time to put one together instead!
Cheap kits are available, although it pays to carefully map out the circuit and understand how it functions, as schematics don’t always match PCB/silkscreen, and components may also vary! The kit I’ve built here works just fine..
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#340 Boldport Club IxpandO
IxpandO is an input/output expansion board based on Microchip’s MCP23017, BoldportClub Project #16. The board design leaves the door open for various configurations. I decided to go initially with the default setup of 8 inputs (switches) and 8 outputs (LEDs), with an Arduino sketch to demonstrate digital output and interrupt-driven input. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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