This is this code of the Arduino connected to my PC. It acts as the receiver and plots the received data to the Serial plotter.
#include <SoftwareSerial.h>
SoftwareSerial HC12(10, 11); // HC-12 TX Pin, HC-12 RX Pin
void setup() {
Serial.begin(9600); // Serial port to computer
HC12.begin(9600); // Serial port to HC12
}
void loop() {
delay(1000);
HC12.write('B');
while (HC12.available()) {
byte bytes[sizeof(float)];
HC12.readBytes(bytes, sizeof(float)); // Read bytes into an array
float voltage;
memcpy(&voltage, bytes, sizeof(float)); // Convert bytes back to float
Serial.println(voltage); // Print the received float
}
}
This is the code of the Transmitter. It is running off a 4 volt battery through a step up converter, with A1 connected directly to the positive terminal of the battery.
#include <SoftwareSerial.h>
SoftwareSerial HC12(10, 11); // HC-12 TX Pin, HC-12 RX Pin
void setup() {
HC12.begin(9600); // Serial port to HC12
}
void loop() {
while (HC12.available()) {
if (HC12.read() == 'B') {
int sensor = analogRead(A1);
float voltage = sensor / 1024.0;
byte bytes[sizeof(float)];
memcpy(bytes, &voltage, sizeof(float));
HC12.write(bytes, sizeof(float)); // Send the float as bytes
}
}
}
The receiver, which is connected to my PC only ever reads 0.80 volts, occasionaly 0.79 volts. Something is wrong and it's not reading 4 volts, but I'm not really sure why.
Both Arduinos are connected to a HC-12 module (SI4463).
Can any of you clever people see the problem?
