Hi All
So I managed to get the BMP280 successfully set up with my Arduino uesterday, and the unit was reporting back temp, pressure and altitude using the I2C A(4) and A(5) pins.
Today I received my NodeMCU ESP8266 board and want to try the same thing using that. I am pretty much unsure of the correct pins to use for the I2C connection from the BMP280 to the board, and when I run the script, I see 'Could not find a valid BMP280 sensor, check wiring!' reported back in the serial monitor.
As a start in the debugging process, could someone advise please as to which pins I should be using on the NodeMCU ESP8266 Dev board.
Here's the sketch
/***************************************************************************
This is a library for the BMP280 humidity, temperature & pressure sensor
Designed specifically to work with the Adafruit BMEP280 Breakout
----> http://www.adafruit.com/products/2651
These sensors use I2C or SPI to communicate, 2 or 4 pins are required
to interface.
Adafruit invests time and resources providing this open source code,
please support Adafruit andopen-source hardware by purchasing products
from Adafruit!
Written by Limor Fried & Kevin Townsend for Adafruit Industries.
BSD license, all text above must be included in any redistribution
***************************************************************************/
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP280.h>
#define BMP_SCK 13
#define BMP_MISO 12
#define BMP_MOSI 11
#define BMP_CS 10
int altitude;
Adafruit_BMP280 bme; // I2C
//Adafruit_BMP280 bme(BMP_CS); // hardware SPI
//Adafruit_BMP280 bme(BMP_CS, BMP_MOSI, BMP_MISO, BMP_SCK);
void setup() {
Serial.begin(9600);
Serial.println(F("BMP280 test"));
if (!bme.begin(0x76)) {
Serial.println("Could not find a valid BMP280 sensor, check wiring!");
while (1);
}
}
void loop() {
Serial.print("Temperature = ");
Serial.print(bme.readTemperature()*9/5+32);
Serial.println(" *f");
Serial.print("Pressure = ");
Serial.print(bme.readPressure() / 100);
Serial.println(" mB");
Serial.print("Approx altitude = ");
Serial.print(bme.readAltitude(1035)); // this should be adjusted to your local forcase
Serial.println(" m");
Serial.println();
delay(2000);
}
