Skip to content

Instantly share code, notes, and snippets.

@tom-a tom-a/bme280.ino
Last active Apr 29, 2019

Embed
What would you like to do?
#include <esp_wifi.h>
#include <Wire.h>
#include "Ambient.h"
WiFiClient client;
Ambient ambient;
const unsigned int PERIOD = 300; //
const unsigned int uS_TO_S_FACTOR = 1000000;
const unsigned int channelId = 00000;
const char* writeKey = "xxxxxxxxxxxxxxxx";
const char* ssid = "SSID";
const char* password = "passowrd";
const byte BME280_ADDRESS = 0x76;
const byte GPIO_34 = 34;
const byte REG_CTRL_MEAS = 0xf4;
const byte REG_CTRL_HUM = 0xf2;
const byte REG_CONFIG = 0xf5;
unsigned long int hum_raw,temp_raw,pres_raw;
signed long int t_fine;
uint16_t dig_T1;
int16_t dig_T2, dig_T3;
uint16_t dig_P1;
int16_t dig_P2, dig_P3, dig_P4, dig_P5, dig_P6, dig_P7, dig_P8, dig_P9;
int8_t dig_H1;
int16_t dig_H2;
int8_t dig_H3;
int16_t dig_H4;
int16_t dig_H5;
int8_t dig_H6;
int read_reg(byte reg)
{
byte val;
Wire.beginTransmission(BME280_ADDRESS);
Wire.write(reg);
Wire.endTransmission(false);
Wire.requestFrom(BME280_ADDRESS, 1, true);
while (Wire.available()) {
val = Wire.read();
}
return val;
}
void write_reg(byte reg_address, byte data)
{
Wire.beginTransmission(BME280_ADDRESS);
Wire.write(reg_address);
Wire.write(data);
Wire.endTransmission();
}
unsigned long int calibration_H(signed long int adc_H)
{
signed long int v_x1;
v_x1 = (t_fine - ((signed long int)76800));
v_x1 = (((((adc_H << 14) -(((signed long int)dig_H4) << 20) - (((signed long int)dig_H5) * v_x1)) +
((signed long int)16384)) >> 15) * (((((((v_x1 * ((signed long int)dig_H6)) >> 10) *
(((v_x1 * ((signed long int)dig_H3)) >> 11) + ((signed long int) 32768))) >> 10) + (( signed long int)2097152)) *
((signed long int) dig_H2) + 8192) >> 14));
v_x1 = (v_x1 - (((((v_x1 >> 15) * (v_x1 >> 15)) >> 7) * ((signed long int)dig_H1)) >> 4));
v_x1 = (v_x1 < 0 ? 0 : v_x1);
v_x1 = (v_x1 > 419430400 ? 419430400 : v_x1);
return (unsigned long int)(v_x1 >> 12);
}
unsigned long int calibration_P(signed long int adc_P)
{
signed long int var1, var2;
unsigned long int P;
var1 = (((signed long int)t_fine)>>1) - (signed long int)64000;
var2 = (((var1>>2) * (var1>>2)) >> 11) * ((signed long int)dig_P6);
var2 = var2 + ((var1*((signed long int)dig_P5))<<1);
var2 = (var2>>2)+(((signed long int)dig_P4)<<16);
var1 = (((dig_P3 * (((var1>>2)*(var1>>2)) >> 13)) >>3) + ((((signed long int)dig_P2) * var1)>>1))>>18;
var1 = ((((32768+var1))*((signed long int)dig_P1))>>15);
if (var1 == 0) {
return 0;
}
P = (((unsigned long int)(((signed long int)1048576)-adc_P)-(var2>>12)))*3125;
if(P<0x80000000) {
P = (P << 1) / ((unsigned long int) var1);
} else {
P = (P / (unsigned long int)var1) * 2;
}
var1 = (((signed long int)dig_P9) * ((signed long int)(((P>>3) * (P>>3))>>13)))>>12;
var2 = (((signed long int)(P>>2)) * ((signed long int)dig_P8))>>13;
P = (unsigned long int)((signed long int)P + ((var1 + var2 + dig_P7) >> 4));
return P;
}
signed long int calibration_T(signed long int adc_T)
{
signed long int var1, var2, T;
var1 = ((((adc_T >> 3) - ((signed long int)dig_T1<<1))) * ((signed long int)dig_T2)) >> 11;
var2 = (((((adc_T >> 4) - ((signed long int)dig_T1)) * ((adc_T>>4) - ((signed long int)dig_T1))) >> 12) * ((signed long int)dig_T3)) >> 14;
t_fine = var1 + var2;
T = (t_fine * 5 + 128) >> 8;
return T;
}
void readData()
{
int i = 0;
uint32_t data[8];
Wire.beginTransmission(BME280_ADDRESS);
Wire.write(0xF7);
Wire.endTransmission();
Wire.requestFrom(BME280_ADDRESS,8);
while(Wire.available()){
data[i] = Wire.read();
i++;
}
pres_raw = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4);
temp_raw = (data[3] << 12) | (data[4] << 4) | (data[5] >> 4);
hum_raw = (data[6] << 8) | data[7];
}
void readTrim()
{
uint8_t data[32],i=0; // Fix 2014/04/06
Wire.beginTransmission(BME280_ADDRESS);
Wire.write(0x88);
Wire.endTransmission();
Wire.requestFrom(BME280_ADDRESS,24); // Fix 2014/04/06
while(Wire.available()){
data[i] = Wire.read();
i++;
}
Wire.beginTransmission(BME280_ADDRESS); // Add 2014/04/06
Wire.write(0xA1); // Add 2014/04/06
Wire.endTransmission(); // Add 2014/04/06
Wire.requestFrom(BME280_ADDRESS,1); // Add 2014/04/06
data[i] = Wire.read(); // Add 2014/04/06
i++; // Add 2014/04/06
Wire.beginTransmission(BME280_ADDRESS);
Wire.write(0xE1);
Wire.endTransmission();
Wire.requestFrom(BME280_ADDRESS,7); // Fix 2014/04/06
while(Wire.available()){
data[i] = Wire.read();
i++;
}
dig_T1 = (data[1] << 8) | data[0];
dig_T2 = (data[3] << 8) | data[2];
dig_T3 = (data[5] << 8) | data[4];
dig_P1 = (data[7] << 8) | data[6];
dig_P2 = (data[9] << 8) | data[8];
dig_P3 = (data[11]<< 8) | data[10];
dig_P4 = (data[13]<< 8) | data[12];
dig_P5 = (data[15]<< 8) | data[14];
dig_P6 = (data[17]<< 8) | data[16];
dig_P7 = (data[19]<< 8) | data[18];
dig_P8 = (data[21]<< 8) | data[20];
dig_P9 = (data[23]<< 8) | data[22];
dig_H1 = data[24];
dig_H2 = (data[26]<< 8) | data[25];
dig_H3 = data[27];
dig_H4 = (data[28]<< 4) | (0x0F & data[29]);
dig_H5 = (data[30] << 4) | ((data[29] >> 4) & 0x0F); // Fix 2014/04/06
dig_H6 = data[31]; // Fix 2014/04/06
}
void setup() {
uint8_t osrs_t = 2; //Temperature oversampling x 2
uint8_t osrs_p = 2; //Pressure oversampling x 2
uint8_t osrs_h = 2; //Humidity oversampling x 2
uint8_t mode = 1; //Force mode
uint8_t t_sb = 5; //Tstandby 1000ms
uint8_t filter = 1; //
uint8_t spi3w_en = 0; //3-wire SPI Disable
uint8_t ctrl_meas_reg = (osrs_t << 5) | (osrs_p << 2) | mode;
uint8_t config_reg = (t_sb << 5) | (filter << 2) | spi3w_en;
uint8_t ctrl_hum_reg = osrs_h;
analogSetPinAttenuation(GPIO_34, ADC_11db);
Wire.begin();
Serial.begin(115200);
write_reg(REG_CTRL_HUM, ctrl_hum_reg);
write_reg(REG_CTRL_MEAS, ctrl_meas_reg);
write_reg(REG_CONFIG, config_reg);
readTrim();
double temp_act = 0.0, press_act = 0.0, hum_act=0.0;
signed long int temp_cal;
unsigned long int press_cal,hum_cal;
int sensorValue = analogRead(GPIO_34);
float voltage = sensorValue * (3.3 / 4095.0);
readData();
temp_cal = calibration_T(temp_raw);
press_cal = calibration_P(pres_raw);
hum_cal = calibration_H(hum_raw);
temp_act = (double)temp_cal / 100.0;
press_act = (double)press_cal / 100.0;
hum_act = (double)hum_cal / 1024.0;
Serial.printf("電源電圧 : %7.2fV\n温度   : %7.2f度\n気圧   : %7.2fhPa\n湿度   : %7.2f%%\n\n", voltage, temp_act, press_act, hum_act);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected.");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
ambient.begin(channelId, writeKey, &client);
ambient.set(5, temp_act);
ambient.set(6, hum_act);
ambient.set(7, press_act);
ambient.set(8, voltage);
ambient.send();
Serial.println("Setup ESP32 to sleep for every " + String(PERIOD) + " Seconds");
Serial.println("Going to sleep now");
esp_wifi_stop();
esp_deep_sleep(PERIOD * uS_TO_S_FACTOR);
delay(1000);
}
void loop() {
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.