ESP8266 modules are great low cost stand alone controllers with built in Wi-Fi, and I already made a simple Blink instructable with ESP8266 NodeMCU module.
The advantage of the ESP8266 over Arduino and other controllers is the builtin Wi-Fi. In this Instructable I will show you how with the help of Visuino you can use two ESP8266 modules to make a remote LCD Display for Temperature and Humidity DHT11 sensor.
In the Instructable, I will use 2 NodeMCU modules. One version 0.9, and the other 1.0. The NodeMCU are the easiest way to program and experiment with ESP8266 controllers. This Instructable however can easily be done with other modules, and the Sensor module can even use ESP-01 module as it needs only one GPIO pin to connect to the DHT11 sensor.
Step 1: Components
- 2 NodeMCU ESP8266 boards (I used both NodeMCU 0.9, and NodeMCU 1.0 versions, but any other combination, or even stand alone ESP-12 will work)
- One DHT11 Sensor module I got from this cheap 37 sensors set
- One I2C 16×2 LCD Display (Back side of the LCD with the I2C adapter showed on Picture 2)
- 7 Female-Female jumper wires
Step 2: Connect the DHT11 to the First NodeMCU ESP8266 Module
- Connect Power(Red wire), Ground(Black wire), and Data(Gray wire) to the DHT11 Module (Picture 1 shows 2 different types of DHT11 sensor modules. As you can see the pins may differ, so connect carefully!)
- Connect the other end of the Ground wire(Black wire) to the Ground pin of the ESP8266 module (Picture 2)
- Connect the other end of the Power wire(Red wire) to the 3.3V Power pin of the ESP8266 module (Picture 2)
- Connect the other end of the Data wire(Gray wire) to the Digital pin 2 of the ESP8266 module (Picture 3)
- Picture 4 shows where are the Ground, 3.3V Power, and Digital 2 pins of the NodeMCU 0.9
Step 3: Connect the I2C LCD Display to the Second NodeMCU ESP8266 Module
- Connect Ground(Black wire), Power(Red wire), SDA(Green wire), and SCL(Yellow wire) to the LCD Module (Picture 1)
- Connect the other end of the SCL wire(Yellow wire) to SCL/Digital pin 1 of the ESP8266 NodeMCU board (Picture 2)
- Connect the other end of the SDA wire(Green wire) to SDA/Digital pin 2 of the ESP8266 NodeMCU board (Picture 2)
- Connect the other end of the Ground wire(Black wire) to the Ground pin of the ESP8266 NodeMCUboard (Picture 3)
- Connect the other end of the Power wire(Red wire) to the 5V(Called “Vin” in version 1.0) Power pin of the ESP8266 NodeMCUboard (Picture 3)
- Picture 4 shows where are the Ground, 5V(Vin) Power, Digital 1, and Digital 2 pins of the NodeMCU 1.0
Read more: Remote WiFi DHT11 Temperature an Humidity Display
