Hello erveryone,
I have a problem with my project. Im using a Lilygo TTGO Lora32 V1.6.1 board with intergrated OLED and LoRa chip. i've added an BME280 sensor to the project.
The problem that im running into is that when i add the BME280 sensor on the I2C bus that de OLED screen only shows static. I can't reset it. Only when is remove the power from the board.
I will add the code below. Note that some functions are commented out. This are future functions.
/*********
Lilygo TTGO LoRa32 V1.6.1 With BME280.
Future:
- Ultrasonic Sensor
- MCP23017 I2C IO Expander
*********/
//Libraries for LoRa
#include <SPI.h>
#include <LoRa.h>
//Libraries for OLED Display
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
//Libraries for BME280
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>
//define the pins used by the LoRa transceiver module
#define SCK 5
#define MISO 19
#define MOSI 27
#define SS 18
#define RST 23
#define DIO0 26
//433E6 for Asia
//866E6 for Europe
//915E6 for North America
#define BAND 433E6
//OLED pins
#define OLED_SDA 21
#define OLED_SCL 22
#define OLED_RST 13
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
//BME280 definition
#define SDA 21
#define SCL 22
TwoWire I2Cone = TwoWire(1);
Adafruit_BME280 bme;
//packet counter
int readingID = 0;
int counter = 0;
String LoRaMessage = "";
float temperature = 0;
float humidity = 0;
float pressure = 0;
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RST);
//int ultraSonicTrig = 4;
//int ultraSonicEcho = 36;
//long duration, cm;
//Initialize OLED display
void startOLED(){
//reset OLED display via software
pinMode(OLED_RST, OUTPUT);
digitalWrite(OLED_RST, LOW);
delay(20);
digitalWrite(OLED_RST, HIGH);
//initialize OLED
Wire.begin(OLED_SDA, OLED_SCL);
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3c, false, false)) { // Address 0x3C for 128x32
Serial.println(F("SSD1306 allocation failed"));
for(;;); // Don't proceed, loop forever
}
//
display.clearDisplay();
display.setTextColor(WHITE);
display.setTextSize(1);
display.setCursor(0,0);
display.print("LORA SENDER");
}
//Initialize LoRa module
void startLoRA(){
//SPI LoRa pins
SPI.begin(SCK, MISO, MOSI, SS);
//setup LoRa transceiver module
LoRa.setPins(SS, RST, DIO0);
while (!LoRa.begin(BAND) && counter < 10) {
Serial.print(".");
counter++;
delay(500);
}
if (counter == 10) {
// Increment readingID on every new reading
readingID++;
Serial.println("Starting LoRa failed!");
}
// Change sync word (0xF3) to match the receiver
// The sync word assures you don't get LoRa messages from other LoRa transceivers
// ranges from 0-0xFF
LoRa.setSyncWord(0xFF);
Serial.println("LoRa Initialization OK!");
display.setCursor(0,10);
display.clearDisplay();
display.print("LoRa Initializing OK!");
display.display();
delay(2000);
}
void startBME(){
I2Cone.begin(SDA, SCL, 100000);
bool status1 = bme.begin(0x76, &I2Cone);
if (!status1) {
Serial.println("Could not find a valid BME280_1 sensor, check wiring!");
while (1);
}
}
void getReadings(){
temperature = bme.readTemperature();
humidity = bme.readHumidity();
pressure = bme.readPressure() / 100.0F;
/**
// The sensor is triggered by a HIGH pulse of 20 or more microseconds.
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
digitalWrite(ultraSonicTrig, LOW);
delayMicroseconds(5);
digitalWrite(ultraSonicTrig, HIGH);
delayMicroseconds(20);
digitalWrite(ultraSonicTrig, LOW);
// Read the signal from the sensor: a HIGH pulse whose
// duration is the time (in microseconds) from the sending
// of the ping to the reception of its echo off of an object.
pinMode(ultraSonicEcho, INPUT);
duration = pulseIn(ultraSonicEcho, HIGH);
// Convert the time into a distance
cm = (duration/2) / 29.1; // Divide by 29.1 or multiply by 0.0343
**/
}
void sendReadings() {
LoRaMessage = String(readingID) + "/" + String(temperature) + "&" + String(humidity) + "#" + String(pressure);
//Send LoRa packet to receiver
LoRa.beginPacket();
LoRa.print(LoRaMessage);
LoRa.endPacket();
display.clearDisplay();
display.setCursor(0,0);
display.setTextSize(1);
display.print("LoRa packet sent!");
display.setCursor(0,20);
display.print("Temperature:");
display.setCursor(72,20);
display.print(temperature);
display.setCursor(0,30);
display.print("Humidity:");
display.setCursor(54,30);
display.print(humidity);
display.setCursor(0,40);
display.print("Pressure:");
display.setCursor(54,40);
display.print(pressure);
display.setCursor(0,50);
display.print("Reading ID:");
display.setCursor(66,50);
display.print(readingID);
display.display();
Serial.print("Sending packet: ");
Serial.println(readingID);
readingID++;
}
void printReadings(){
Serial.print("T: ");
Serial.print(temperature);
Serial.print(", H: ");
Serial.print(humidity);
Serial.print(", P: ");
Serial.print(pressure);
//Serial.print(", D: ");
//Serial.print(cm);
//Serial.print("cm");
Serial.println();
}
void setup() {
//initialize Serial Monitor
Serial.begin(115200);;
startOLED();
startBME();
startLoRA();
//pinMode(ultraSonicTrig, OUTPUT);
//pinMode(ultraSonicEcho, INPUT);
}
void loop() {
getReadings();
sendReadings();
printReadings();
delay(10000);
}
Note that the I2C pins are defined twice. This is because the 2 libraries both call them different.
Thankyou for your help!
Rick