User Tools

Site Tools


iot

Basic Info

Type Arduino Uno WiFi ESP8266 NodeMCU ESP 32
Digital I/O 13 11
Analog I/O 6 1
PWM 6 10
Frequency 16MHz 80MHz or 160MHz 160MHz or 240MHz
I/O Voltage 5V 3,3V 3,3V
Flash size 32kB (-0,5kB bootloader) 4096kB
RAM 8kB 96kB 520kB
GPIO Current 40mA 12mA

Power consumption ESP8266

Mode Current
Wifi Send 120mA
Wifi Receive 56mA
Modem Sleep 15mA
Deep Sleep 10μA*

* Deep sleep ~300s and waking up to connect to the AP (taking about 0.3~1s)

What is possible on ESP8266?

Wifi 2.4 GHz b/g/n WPA2
Internal Analog-Digital-Converter (0-1V)
HX711 - inexpensive 24bit ADC
Read battery voltage
AM2320 humidity and temperature sensor - i2c interface
BME280/BMP280 temperature/air presssure/humidity sensor
ADXL345 triple axis accelerometer
L3G4200D three axis digital gyroscope
BMP085/180 temperature and pressure sensor
HMC5883L three axis digital compass
Audio output 16KHz / mono / 8Bit
Switec X.27 instrument stepper motor
TSL2561 - check illuminance in lux
Serial line communication

ESP8266 NodeMCU Pinout


PIN IO Remark Function
D0 GPIO16 May work! Connected to LED Wake up from sleep
* D1 GPIO5 OK
* D2 GPIO4 OK
D3 GPIO0 Don't use! Turn flashing
D4 GPIO2 Don't use! Conflict while booting
* D5 GPIO14 OK
* D6 GPIO12 OK
D7 GPIO13 May work!
D8 GPIO15 Don't use! Conflict while booting
SDD2 GPIO9 May work but…
SDD3 GPIO10 May work but…
RX GPIO3 Usable, but conflict with USB converter
TX GPIO1 Usable, but conflict with USB converter

The maximum current that can be drawn from a single GPIO pin is 12mA.

Wifi Deauthentication

Lua Sources

--This file is init.lua
wifi.setmode(wifi.STATION)
wifi.sta.config("janforman.dmz","")

local IDLE_AT_STARTUP_MS = 5000;

tmr.alarm(1,IDLE_AT_STARTUP_MS,0,function()
    dofile("status.lua")
end)
--This file is status.lua

tmr.alarm(0, 1000*60*10, tmr.ALARM_AUTO, function ()

-- loop
conn = nil
conn=net.createConnection(net.TCP, 0) 

conn:on("receive", function(conn, payload) 
                       success = true
                       print(payload) 
                       end) 

conn:on("connection", function(conn, payload) 
                       print('\nConnected') 
                       conn:send("GET /"..(tmr.time() / 3600)
                        .." HTTP/1.1\r\n" 
                        .."Host: janforman.com\r\n" 
               		   .."Connection: close\r\n"
                        .."Accept: */*\r\n" 
                        .."User-Agent: Mozilla/4.0 (compatible; esp8266 Lua; Windows NT 5.1)\r\n" 
                        .."\r\n")
                       end) 
conn:on("disconnection", function(conn, payload) print('\nDisconnected') end)
conn:connect(80,'janforman.com') 
-- loop

end)

Turn internal LED on/off

gpio.mode(4,gpio.OUTPUT)
gpio.write(4,gpio.LOW)
LED_PIN = 4
gpio.mode(LED_PIN,gpio.OUTPUT)
value = true

tmr.alarm(0,500,tmr.ALARM_AUTO, function()
  gpio.write(LED_PIN, value and gpio.HIGH or gpio.LOW)
  value = not value
end)

HTTP GET

http.get("http://janforman.com/",nil,function(code,data)
 if(code < 0) then print ("Failed")
  else print(code,data)
 end
end)
iot.txt · Last modified: 2017/08/08 19:55 by Jan Forman