HiLetgo 2pcs ESP8266 NodeMCU LUA CP2102 ESP-12E Internet WiFi Development Board Open Source Serial Wireless Module Works Great with Arduino IDE/Micropython (Pack of 2PCS)

Complete project description follows. I'm using the NodeMCU as a web server and it works great. It was a struggle to find example code that actually connects outside my local area network but I found some. Also had to learn the rudiments of HTML. Only issue is it seems to need to be restarted every 4 or 5 days. Since I'm going to leave it in a remote location I'll put some code in the MEGA that sits right next to it to restart the NodeMCU every couple days, by pulling the RST pin low. Green Pond Bridge Boat Clearance At ‘very low tide’ the clearance under Green Pond Bridge in Cape Cod is 6’6” or less and that is too low for the boat I use. The tide charts for Falmouth, MA are theoretical and can vary as much as 18” from what is actually happening at the bridge. This system monitors the clearance and transmits the information on the internet. All of these parts were purchased from Amazon. Transmitter An (Arduino) Elegoo UNO R3 board is connected to an Elegoo HC-SR04 Ultrasonic Distance Sensor. The UNO and the sensor calculate the distance from a fixed dock to the sea level, then transmit that data using a MakerFocus NRF24L01 Wireless Transceiver to the Receiver described below. The Transmitter sits on the end of a dock where there is no power, so the UNO, Transceiver and Distance Sensor are powered by the energyShield 2. This battery has special capabilities – it wakes everything up every 15 minutes. The system takes a couple readings of the distance to the water then transmits that data, then the battery shuts it all off. The data transmitted includes information from the battery – time, date, and voltage. I have been testing this unit at home (in Dallas) and it has been operating outside, for about 20 days. Based on battery drain it looks like it will operate for about 4-5 months before it needs a recharge. When the temperature drops below zero the system still works fine but the voltage reported in the battery seems low. All of this is housed in a plastic box printed for the purpose with a FlashForge 3d Printer Creator Pro, using eSun White ABS+ filament Picture below. Receiver An (Arduino) Elegoo MEGA 2560 R3 is connected to another NRF24 Transceiver to receive the data. The MEGA does the math to convert the distance from the dock to the water, to the bridge clearance. Then the information is displayed on an Elegoo UNO R3 Touch Screen (that also works fine on the Mega). Picture below. A small plastic frame for the Receiver was also printed on the 3d printer Web Server Finally, the information in the MEGA is transmitted over a serial bus to a Hiletgo ESP8266 NodeMCU ESP-12E Internet WIFI Development Board (Also operates using Arduino IDE programming). This board is connected to the MEGA via the XCSOURCE Logic Level Converter and powered by a UCEC MB102 Breadboard Power Supply Module. All mounted on an Elegoo Breadboard. The ESP8266 is programmed to be a web server. It connects to the internet through the modem/router provided by AT&T. Picture of my cell phone below.

Best performance n price too

Ho acquistato il microcontroller per costruire una semplice stazione meteo casalinga abbinandolo a un display da 2.8” e a un sensore BME280 sempre HiLetgo. Il tutto è arrivato in 2-3 giorni grazie al fatto che viene spedito da Amazon (ordinando da altri siti concorrenziali avrei risparmiato pochi centesimi ma avrei dovuto aspettare più di un mese perché spediti dalla Cina). Il modulo arriva confezionato con il classico sacchetto antistatico e con le strisce dei contatti già saldate (comodo per iniziare ad usare il dispositivo fin da subito). Per evitare che i piedini vengano piegati durante il trasporto sono protetti da un rettangolo di polietilene. Lo stampato e le saldature risultano di buona fattura. Il modulo e dotato di memoria flash da 4MB. Per utilizzare questi moduli con l’IDE Arduino bisogna prima configurare l’ambiente di sviluppo, operazione che si completa in pochi istanti grazie alle guide presenti in rete o sul sito del produttore hiletgo.com. Tutto funziona alla perfezione e senza nessun problema. Prodotto decisamente interessante ed economico.

Solo me llego una pieza, y el precio que pague fue por 2 piezas, no es lo que me ofrecieron, busque nuevamente el anuncio y ya no esta disponible

Es un ESP8266 con Wifi. Con Arduino y otras cosas puedes hacer grandes proyectos. Con el Hiletgo PIR puede encender y apagar dispositivos. El tablero también es muy pequeño.