Hi, im trying to print the value of my DFRobot Heartrate sensor, i’m using mosquitto mqtt broker with node-red and an esp8266 as client. I can’t print out the variable because it doesn’t follow the parameters in the pubsub client. How can I make a way to print this? I’ve searched for quite awhile but ended up with nothing, Im fairly new to arduino and programming so please help me.
This is the code that i’m working on
/*****
*****/
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#define heartratePin A0
#include "DFRobot_Heartrate.h"
DFRobot_Heartrate heartrate(DIGITAL_MODE); ///< ANALOG_MODE or DIGITAL_MODE
// Change the credentials below, so your ESP8266 connects to your router
const char* ssid = "Tenda_FE2038";
const char* password = "huertas032793";
// Change the variable to your Raspberry Pi IP address, so it connects to your MQTT broker
const char* mqtt_server = "192.168.1.14";
// Initializes the espClient. You should change the espClient name if you have multiple ESPs running in your home automation system
WiFiClient espClient;
PubSubClient client(espClient);
// Timers auxiliar variables
long now = millis();
long lastMeasure = 0;
// Don't change the function below. This functions connects your ESP8266 to your router
void setup_wifi() {
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("WiFi connected - ESP IP address: ");
Serial.println(WiFi.localIP());
}
// This functions is executed when some device publishes a message to a topic that your ESP8266 is subscribed to
// Change the function below to add logic to your program, so when a device publishes a message to a topic that
// your ESP8266 is subscribed you can actually do something
void callback(String topic, byte* message, unsigned int length) {
Serial.print("Message arrived on topic: ");
Serial.print(topic);
Serial.print(". Message: ");
String messageTemp;
for (int i = 0; i < length; i++) {
Serial.print((char)message[i]);
messageTemp += (char)message[i];
}
Serial.println();
Serial.println();
}
// This functions reconnects your ESP8266 to your MQTT broker
// Change the function below if you want to subscribe to more topics with your ESP8266
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Attempt to connect
if (client.connect("ESP8266Client")) {
Serial.println("connected");
// Subscribe or resubscribe to a topic
// You can subscribe to more topics (to control more LEDs in this example)
client.subscribe("bpm/test");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
// The setup function sets your ESP GPIOs to Outputs, starts the serial communication at a baud rate of 115200
// Sets your mqtt broker and sets the callback function
// The callback function is what receives messages and actually controls the LEDs
void setup() {
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
}
// For this project, you don't need to change anything in the loop function. Basically it ensures that you ESP is connected to your broker
void loop() {
if (!client.connected()) {
reconnect();
}
if(!client.loop())
client.connect("ESP8266Client");
now = millis();
// Publishes new temperature and humidity every 30 seconds
if (now - lastMeasure > 200) {
lastMeasure = now;
uint8_t rateValue;
heartrate.getValue(heartratePin); ///< A1 foot sampled values
rateValue = heartrate.getRate(); ///< Get heart rate value
if(rateValue) {
Serial.println(rateValue);
}
delay(20);
client.publish("bpm/test", rateValue);
}
}
This is where the compiler is pointing to in the error
uint8_t rateValue;
heartrate.getValue(heartratePin); ///< A1 foot sampled values
rateValue = heartrate.getRate(); ///< Get heart rate value
if(rateValue) {
Serial.println(rateValue);
}
delay(20);
client.publish("bpm/test", rateValue);
this the error that im getting
thank you in advance!
