Some sketches for Arduino IDE and small devices
Subscribe to Amazon AWS IoT topic from M5Stack ESP32 device. It expects to receive message in JSON format with one 'data' floating point value: { "data" : 12.345 }. Then recevied value is printed on a screen and written to a text file on SD card.
Sketch for small USB-powered device to open Came gates with known codes - you need to put your codes in file after // Defind gate codes line. (You may use RCSwitch library to sniff gate code from air - it works fine for reception but I failed to use it for transmission so custom function is used).
Device itself consists of Arduino Nano, 3x4 Keypad and 433 MHz transmitter. Each button have a 24-bit code assigned - this code is send via @433 MHz with Came-gate encoding. Pins from 3 to 9 are connected to Keypad, pin 11 is connected to trasmitter DATA pin. Transmitted is powered from GND and +5V pins of Arduino.
This scetch uses M5Stack device and 433 MHz receiver module connected to Pin 2 together with modified RCSwitch arduino library (see first lines of source code about library modifications).
It sniffs 433 MHz transmission for Came gate codes - if code is received it is stored in internall 12-items buffer snd higlighted on the screen.