Transmitter and receiver with Proximity sensor and OLED display

Using Arduino Programming Questions
1

Hello All, I am working on a project where I am using a proximity sensor and displaying the distance on an OLED display. My issue is I need to separate the oled and the sensor because I cant have a cable track. I want to use two nodemcu's for the small footprint. I have used them as a transmitter and receiver to turn on a relay. However, I am not sure how to use them where I can transmit the distance to the receiver? Would anyone be able to steer me in the right direction? I will paste the working distance code. I hope I am following correct protocol here. Thank you in advance.

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define CommonSenseMetricSystem
//#define ImperialNonsenseSystem

#define trigPin 13
#define echoPin 12

#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);

void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  //initialize with the I2C addr 0x3C (128x64)
  display.clearDisplay();
}

void loop() {
  long duration, distance;

  digitalWrite(trigPin, LOW);  //PULSE ___|---|___
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);

#ifdef CommonSenseMetricSystem
  distance = (duration / 2) / 29.1;
#endif
#ifdef ImperialNonsenseSystem
  distance = (duration / 2) / 73.914;
#endif

  display.setCursor(0, 0);  //oled display
  display.setTextSize(4);
  display.setTextColor(WHITE);
  display.println(distance);
  display.setCursor(95, 0);
  display.setTextSize(2);

#ifdef CommonSenseMetricSystem
  display.println("cm");
#endif
#ifdef ImperialNonsenseSystem
  display.println("in");
#endif

  display.display();

  delay(500);
  display.clearDisplay();

  Serial.println(distance);  //debug
}
2

how far apart are the devices? what is the environment?

have a look at ESP-now - works with ESP32 and ESP8266

alternativily you could configure an ESP device as an access point (example AP with web server) and run a simple telenet service to transfer the data

3

They will travel from 6 feet down to zero. I cant use internet cuz of where i am at but that would have been great.

4

neither ESP-NOW or an Access Point requires the internet - both operate locally

5

OK, I will have to check that out but I still dont know how to get the display to work wirelessly?

6

the first thing is to test the wireless connectivity - I would suggest ESP-NOW is the simplest
then connect the sensors to one NodeMCU which then transmits the data to the other NodeMCU which has the LCD
is that what you require?

7

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