Wemos D1 mini & Wemos DHT shield

Community Help With My Project Helped
1

Hello, I try to setup my Wemos D1 mini with a Wemos DHT shield (temp/hum). Is there a sample project with these components? I am a little bit lost with all that different libraries for all that different sensors.

It get it working with Wemos D1 mini and a DS18B20, at least.

Greetings

2

first connect your wemos using this Adding a New Device using MQTT
and for DSB18B20 Converting Cayenne Arduino LIbrary sketches to Cayenne MQTT Arduino - #2 by rsiegel

1 Like
3

Thank you.
But that is already working. Withe the DSB18B20.

I donā€™t get it working with the Wemos DHT shield.

4

can you post the code.

5

This works for the DSB18B20.
But how can I address the DHT12 shield?
I have to include the #include <WEMOS_DHT12.h> library.
But I donā€™t now how to read the values and send it to cayenne.

//#define CAYENNE_DEBUG
#define CAYENNE_PRINT Serial
#include <CayenneMQTTESP8266.h>
#include <OneWire.h>
#include <DallasTemperature.h>

#define ONE_WIRE_BUS D4

OneWire oneWire(ONE_WIRE_BUS);

DallasTemperature sensors(&oneWire);

// WiFi network info.
char ssid = ā€œ";
char wifiPassword[] = "**ā€;

// Cayenne authentication info. This should be obtained from the Cayenne Dashboard.
char username = ā€œ*";
char password[] = "ā€;
char clientID = ā€œ***********ā€;

unsigned long lastMillis = 0;

void setup() {
Serial.begin(9600);
Cayenne.begin(username, password, clientID, ssid, wifiPassword);

sensors.begin();
}

void loop() {
Cayenne.loop();
}

// Default function for sending sensor data at intervals to Cayenne.
// You can also use functions for specific channels, e.g CAYENNE_OUT(1) for sending channel 1 data.
CAYENNE_OUT_DEFAULT()
{
sensors.requestTemperatures();
// Write data to Cayenne here. This example just sends the current uptime in milliseconds on virtual channel 0.
//Cayenne.virtualWrite(0, millis());
// Some examples of other functions you can use to send data.
Cayenne.celsiusWrite(1, sensors.getTempCByIndex(0));
//Cayenne.luxWrite(2, 700);
//Cayenne.virtualWrite(3, 50, TYPE_PROXIMITY, UNIT_CENTIMETER);
}

// Default function for processing actuator commands from the Cayenne Dashboard.
// You can also use functions for specific channels, e.g CAYENNE_IN(1) for channel 1 commands.
CAYENNE_IN_DEFAULT()
{
CAYENNE_LOG(ā€œChannel %u, value %sā€, request.channel, getValue.asString());
//Process message here. If there is an error set an error message using getValue.setError(), e.g getValue.setError(ā€œError messageā€);
}

6

Hello, any ideas?

7

i have not worked with this shield and if you have any documentation about it we can try to solve the problem.

8

If you have the time, it would be cool to have a look here:

9

Are you able to get reading from the shield?

10

No. Sorry.
I tried a more easy setup.
Raspberry Pi 3 and the shield, but I donā€™t get it running.

11

try with wemos. it should work.

12

Hello Shramik, I used the WEMOS sketch and it works. I can read the values in the serial output.

#include <WEMOS_DHT12.h>

DHT12 dht12;

void setup() {

Serial.begin(115200);

}

void loop() {

if(dht12.get()==0){
Serial.print("Temperature in Celsius : ");
Serial.println(dht12.cTemp);
Serial.print("Temperature in Fahrenheit : ");
Serial.println(dht12.fTemp);
Serial.print("Relative Humidity : ");
Serial.println(dht12.humidity);
Serial.println();
}
delay(1000);

}

But how can I pass the variables to Cayenne?

Greetings

13

I used this:

Cayenne.celsiusWrite(1, dht12.cTemp);
Cayenne.virtualWrite(2, dht12.fTemp);
Cayenne.virtualWrite(3, dht12.humidity);

and it is working!

Thank you.

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