ESP8266 wont start if ds1820b sensor is connected
Posted: Tue Apr 12, 2016 6:19 amHi I have a NodMCU 1.0ESP-12E
Trying to build a sous vide machine with a ds18b20 sensor a 16x2 lcd i2c and SSR float switch and some more parts.
But have gone back to bare minimum code to sort out the error.
When i boot with the sensor attached it dose not work it powers on but seems like its not able to skip out of the setup.
But if I connect the sensor when its booted up it displays correct and sends the temp (input).
This i how i wired the ds18b20 sensor.
Tried to connect the + to VIN taht is ~5V but I got scared i would burn anything so disconnected it quickly.
Data = D8 pin
GND = GND pin
+ = 3.3V
4,7 ohm resistor between + and data.
Board is power by a 2A USB charger or by the USB port on the computer.
On the server side I have a small php script that stores the values in a MySQL database and the a plugin script that plots it in a graph. Everything is working fine except the sensor at startup.
Any thoughts?
Trying to build a sous vide machine with a ds18b20 sensor a 16x2 lcd i2c and SSR float switch and some more parts.
But have gone back to bare minimum code to sort out the error.
When i boot with the sensor attached it dose not work it powers on but seems like its not able to skip out of the setup.
But if I connect the sensor when its booted up it displays correct and sends the temp (input).
This i how i wired the ds18b20 sensor.
Tried to connect the + to VIN taht is ~5V but I got scared i would burn anything so disconnected it quickly.
Data = D8 pin
GND = GND pin
+ = 3.3V
4,7 ohm resistor between + and data.
Board is power by a 2A USB charger or by the USB port on the computer.
Code: Select all
#include <DallasTemperature.h>
#include <OneWire.h>
#include <ESP8266WiFi.h>
#define ONE_WIRE_BUS D8 // DS18B20 temp sensor
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
DeviceAddress tempSensor; // Arrays to hold device address
double SetPoint = 52.50; // Variable for SetPoint
double Input; // Variable for input (temp sensor)
unsigned long DelayForConnect = 15000;
unsigned long TimeToConnect;
/************* WIFI ***************/
const char* server = "192.168.1.5";
const char* MY_SSID = "*****";
const char* MY_PWD = "*****";
void setup() {
Serial.begin(115200);
delay(10);
// Start up the DS18B20 One Wire Temperature Sensor
sensors.begin();
sensors.setResolution(tempSensor, 12);
sensors.setWaitForConversion(false);
connectWifi();
}
void loop() {
sensors.requestTemperatures(); // Send the command to get temperatures
Input = sensors.getTempCByIndex(0);
yield();
if (TimeToConnect + DelayForConnect < millis()) {
sendToServer(Input, SetPoint);
TimeToConnect = millis();
}
yield();
}
void connectWifi()
{
Serial.print("Connecting to ");
Serial.println(MY_SSID);
WiFi.begin(MY_SSID, MY_PWD);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}//end connect
void sendToServer(double Input, double Setpoint)
{
WiFiClient client;
Serial.print("connecting to ");
Serial.println(server);
if (!client.connect(server, 80)) {
Serial.println("connection failed");
return;
}
String data = "input=" + (String)Input + "&setpoint=" + (String)Setpoint ;
Serial.println(data);
String url = "GET /add.php?" + data + " HTTP/1.1";
client.println(url);
client.println("Host: 192.168.1.5");
client.println("Connection: close");
client.println();
delay(500);
// Read all the lines of the reply from server and print them to Serial
while (client.available()) {
String line = client.readStringUntil('\r');
Serial.print(line);
}
client.stop();
}On the server side I have a small php script that stores the values in a MySQL database and the a plugin script that plots it in a graph. Everything is working fine except the sensor at startup.
Any thoughts?