serial communication between Arduino and Nodemcu - arduino

Question

I'm trying to read voltage value using Analog pin A0 in arduino uno and transmit the read voltage to Nodemcu but not getting same voltage at NodeMcu as on Arduino side for Ex. for 5 volt at Arduino i get only 4 volt at Nodemcu.
i have made the delay of both the sketches equal even tried without any delay
also tried connecting the ground pin of both device
ARDUINO CODE
#include <SoftwareSerial.h>
SoftwareSerial s(5,6);
void setup() {
s.begin(9600);
Serial.begin(9600);
}
void loop() {
// read the input on analog pin 0:
int ADCdata = analogRead(A0);
float voltage = (ADCdata * 0.0048828125);
Serial.println(ADCdata);
Serial.println(voltage);
if(s.available()>0)
{
s.write(voltage);
}
delay(1000);
}
NODEMCU CODE
#include <SoftwareSerial.h>
SoftwareSerial s(D6,D5);
void setup() {
s.begin(9600);
Serial.begin(9600);
}
void loop() {
s.write("s");
if (s.available()>0)
{
data=s.read();
Serial.println(data);
}
delay(1000);
}

Answer 1

I would send the float data as a string:
s.println(value)
This will append a newline to mark the end of the string.
On the receiving side, read the line and convert to float.
float value = s.parseFloat();