Alexa Local FM Radio

Alexa Echo Dot playing local FM radio radio stations using ESP8266 WiFi module, RDA5807 FM receiver module and audio Bluetooth transmitter.

source code (Arduino):
https://github.com/julznc/alexa_esp_fmradio

suggestion for improvement:
use ESP32, instead of ESP8266, since it already has built-in bluetooth functionality.

references:
https://bitbucket.org/xoseperez/fauxmoesp
https://github.com/me-no-dev/ESPAsyncWebServer
https://github.com/mathertel/Radio

Set-Top-Box Remote Configurations

Set-top-box infrared remote configuration files for LIRC (*.conf) and irplus Android app (*.irplus)

ABS-CBN TV Plus (Atlanta-DTH STB)

Geniric ISDB-T STB

DTLS Reverse Proxy

Lightweight DTLS reverse proxy server based on tinydtls and libev.

https://github.com/julznc/dtlsproxy

ATtiny IR Remote

ATtiny2313 Infrared Sender

parts:

• ATtiny2313 @4MHz (internal oscillator)
• IR LED (series with 220-ohm resistor)
• Tact switches
• 3.7V lithium ion battery & Capacitor

avr-gcc (main.c) code:


References:
ESP8266 IR Remote
z3t0/Arduino-IRremote
ATtiny Low Power

ESP8266 IR Remote

Control your appliances (e.g. TV and AV systems) via WiFi+IR.




Arduino code:


References:
markszabo/IRremoteESP8266
Sony IR codes
Sony SIRC protocol

WiFi RGB Matrix

Here's a DIY flexible 36x8 RGB-LED-matrix controlled via WiFi connection using an ESP8266 module.



Arduino Code: julznc/wifi_rgb_matrix


Assembly:

References:
NeoPixelBus - for interfacing WS2812 LEDs to ESP8266 controller
Adafruit-GFX-Library - with font library for displaying texts
LED Matrix Studio - for creating bitmap images

ESP8266 PWM Android Controller

Control ESP8266 PWM outputs* with Android.

Android app: play.google/wifipwm
Android src: github/esp_wifi_pwm

demo:


ESP8266 init.lua :

wifi.setmode(wifi.STATION)
wifi.sta.config("WIFI_SSID","WIFI_PASSWORD")

local GP0 = 3
local GP2 = 4
local port = 3456

print(wifi.sta.getip())

srv=net.createServer(net.UDP)
srv:on("receive", function(cli, rcv)
    --print(rcv)
    rx={}
    for i, s in string.gmatch(rcv, "(%w+)=(%w+)") do
      rx[i]=s
      --print(i, rx[i])
    end
    if rx.d0 then
      pwm.setduty(GP0,rx.d0)
      --print("GP0 duty",rx.d0)
    elseif rx.d2 then
      pwm.setduty(GP2,rx.d2)
      --print("GP2 duty",rx.d2)
    elseif rx.f0 and rx.c0 then
      pwm.setup(GP0,rx.f0,rx.c0)
      pwm.start(GP0)
      print("GP0 freq",rx.f0,"cycles", rx.c0)
    elseif rx.f2 and rx.c2 then
      pwm.setup(GP2,rx.f2,rx.c2)
      pwm.start(GP2)
      print("GP2 freq",rx.f2,"cycles", rx.c2)
    end
    cli:send(rcv)
  end)
srv:listen(port)

*PWM outputs nodemcu pwm

• pins GP0 and GP2
• up to 1kHz only
• 0-100%duty (note: 1023 cycles = 100% duty)