Gina

That didn't work!!

I think I'll try splitting the if and the begin operations

  bool status1 = bme.begin(0x76);  
  bool status2 = bme.begin(0x77);  
  if (!status1 and !status2) {
    Serial.println("Could not find a valid BME280 sensor, check wiring!");
    while (1);
  }

The second BME280 set to address 0x77 does not seem to be working.  Wondering if using one on I2C bus and other on SPI bus would be better that both on I2C with different addresses.  Or maybe I'm doing it wrong.

I'm setting the two sensors as

Adafruit_BME280 bme; // I2C (0x76)
Adafruit_BME280 bme2; // I2C (0x77)

Setting them going with :-

void setup() {
  Serial.begin(115200);
  // default settings
  // (you can also pass in a Wire library object like &Wire2)
  //status = bme.begin();  
  if (!bme.begin(0x76) and (!bme2.begin(0x77))) {
    Serial.println("Could not find a valid BME280 sensor, check wiring!");
    while (1);
  }

Then reading by :-

    temperature = bme.readTemperature();   

    obsT = bme2.readTemperature();

What I'm unsure of is whether

  if (!bme.begin(0x76) and (!bme2.begin(0x77))) {

Really does begin both.

WIP

Yes, that makes sense and that's what I'm doing.

Now trying to get a sensible layout in the Dashboard.  There must be some way to position the widgets but I haven't found it yet!  Still working on the sizes.

Changed the display.  I think this is better.  I don't think the Observatory inside sensor is working properly though.  The Observatory Roof controls are just "place holders" ATM as I haven't got an ESP32 connected for controlling the ROR yet.

I've put the obsy sensor unit back out in the obsy, plugged the outside BME280 in and powered up.  The outside pressure isn't working and I'm not sure about the inside (obsy) readings.  The Living Room unit is working fine.  There are no spikes showing (without Forced Mode).  I'm not too worried about the outside pressure as I have the indoor pressure and that's sufficient.  Think I'll now do some tidying up of the display as a lot of it was just for testing.

The spikes in the temperature history are bad!  OTOH I'm not sure I need the history for inside the obsy - a single current reading should be sufficient.

What size timbers are you using for the roof?

Yes, I would think so.

Looks like it's back to the dumping of out-of-range values!

Reading the github library advanced section for weather...

    bme.setSampling(Adafruit_BME280::MODE_FORCED,
                    Adafruit_BME280::SAMPLING_X1, // temperature
                    Adafruit_BME280::SAMPLING_X1, // pressure
                    Adafruit_BME280::SAMPLING_X1, // humidity
                    Adafruit_BME280::FILTER_OFF   );

This is what I'm using except for the pressure, which I'm not reading anyway.

Added that and now getting readings again but also still getting spikes!!

Looked at the Adafruit BME280 library in github and found this :-

Now to the spikes problem.  Adding this code to the Setup section.

    bme2.setSampling(Adafruit_BME280::MODE_FORCED,
                    Adafruit_BME280::SAMPLING_X1, // temperature
                    Adafruit_BME280::SAMPLING_X16, // pressure
                    Adafruit_BME280::SAMPLING_X1, // humidity
                    Adafruit_BME280::FILTER_OFF   );

Result is that the readings are not changing at all so not the entire solution!!

Found my problem - yep - coding wrong.  Had the humidity reading temperature 🤣  When I looked at MQTT Explorer and saw that the humidity and temperature were exactly the same, I twigged!

Have the obsy sensor unit on the table running from bench PSU.  The second BME280 is working but doesn't look right.  I can't see it being right that the humidity one side of the room is 67% and the other side just 20%.  Temperature seems sensible though - the table is near the big picture window and expected to be a bit cooler.

The reason there's no readings for Outside is that the outside BME280 is not plugged in.

Next is to change the code in the obsClient sketch to use the second BME280 instead of the DHT22.  Then I can make a link and set the present BME280 to address 77 and then take the unit out to the obsy and plug the other BME280 in (the one in the Stevenson screen).  Maybe not tonight as it's raining again!!

At long last!!!  PHEW!!!

New reconnect code. Changed to if (client.connect("indoorClient"))  {

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect("indoorClient")) {
      Serial.println("connected");
      // Subscribe
      client.subscribe("esp32/output");
      client.subscribe("esp32/roof");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

And it works!!

Finally, problem SOLVED

Changed from "espClient" to  "indoorClient".   Again worked until I switched on the obsClient.  Had the Serial Monitor working during this process.  When the obsClient was turned on the indoorClient started having connection problems.

I tried restarting the espclient, no joy.  I can certainly rename espclient.

Thanks.  I'll try that.  Can't shed any light on why I can't get two clients working at the same time, can you?

Again, as soon as I switched off the obsy client the living room client worked.

Not that after all!!  Changed the obsy client to "obsClient".  So one is "espClient" and the other "obsClient".  The obsClient is working the espClient isn't.

WiFiClient obsClient;
PubSubClient client(obsClient);
long lastMsg = 0;
char msg[50];
int value = 0;