search

arendst / Tasmota

Alternative firmware for ESP8266 and ESP32 based devices with easy configuration using webUI, OTA updates, automation using timers or rules, expandability and entirely local control over MQTT, HTTP, Serial or KNX. Full documentation at
https://tasmota.github.io/docs
GNU General Public License v3.0
21.75k stars 4.72k forks source link

Wemos d1 mini DHT shield V3.0.0 #4768

Closed igazka closed 5 years ago

igazka commented 5 years ago

Have you look for this feature in other issues and in the wiki? DHT shield version v1.0.0 support found, v3.0.0 not. Is your feature request related to a problem? Please describe. image image This is with a Dht shield v3.0.0. Describe the solution you'd like Support for the DHT shield v3.0.0

Jason2866 commented 5 years ago

You found a solution via Module Generic. Not every device can be added because of the limited hardware resources from the ESP chip. Feel free to add your finding to the wiki!

arendst commented 5 years ago

The DHT device is not a I2C device so do not expect any useful info when connecting a DHT using the SDA/SCL GPIO config.

See the wikki how to configure/connect a DHT.

igazka commented 5 years ago

The DHT device is not a I2C device so do not expect any useful info when connecting a DHT using the SDA/SCL GPIO config.

See the wikki how to configure/connect a DHT.

I did read the wiki, and did not found that the shield i am refering to. I am talking about this shield: https://wiki.wemos.cc/products:d1_mini_shields:dht_shield

Jason2866 commented 5 years ago

This is not a sensor it is a random generator connected via I2C.

andrethomas commented 5 years ago

Some DH12 sensors are around that are I2C variants of sensors other than the DHT ones but they are encased the same.

You getting a false detect for a BH1750 which is on I2C address 0x23 or 0x5C - If you perform an i2cscan command from the console and find which of the two addresses are found you may be able to determine what the sensor is based on that, but its definitely not a traditional single wire sensor based on the schematic in the wiki.

igazka commented 5 years ago

Some DH12 sensors are around that are I2C variants of sensors other than the DHT ones but they are encased the same.

You getting a false detect for a BH1750 which is on I2C address 0x23 or 0x5C - If you perform an i2cscan command from the console and find which of the two addresses are found you may be able to determine what the sensor is based on that, but its definitely not a traditional single wire sensor based on the schematic in the wiki.

I found 0x5c with the "i2cscan" command. This is the newest dht12 shield(v3.0.0) for the wemos d1 mini as i linked above. It is communicating via D1(SCL) and D2(SDA), according to the site of the product.

Jason2866 commented 5 years ago

Let me explain my comment. Since DHT 11 (DHT12 is a variant of this) is a very bad and outdated sensor there will be no support for this sensor. There are extreme better sensors which are already supported (for I2C as example the BME280)

andrethomas commented 5 years ago

I2C Address find on 0x5C is most likely a repurposed AM2315 or equivalent. There is no driver for this in Tasmota so it will not work at this time.

As recommended by @Jason2866 rather obtain a BME280 as it will yield better results than a DHT11/12/22 would anyway.

andrethomas2 commented 5 years ago

Closing this issue as it has been answered.

Support Information

See Wiki for more information. See Chat for more user experience.

vinibali commented 10 months ago

Let me explain my comment. Since DHT 11 (DHT12 is a variant of this) is a very bad and outdated sensor there will be no support for this sensor. There are extreme better sensors which are already supported (for I2C as example the BME280)

It's not that bad actually: https://www.bvinarz.org/20230827/compare-bosch-bmp280-and-dht12-temperature-sensor-accuracy/

barbudor commented 10 months ago

1° is bad Now comparing BMP280 to DHT12 without a proper reference such a a high accuracy thermometer is pointless. You know there is a difference but you still don't know who is good or who is bad.

Hdc1080 is even better than BME280 if you don't need the pressure

There are already enough T/HR sensors supported by Tasmota. There's no will to make Tasmota support all sensors available in the world but focus on a few of good sensors that people are OK to maintain.

vinibali commented 9 months ago

1° is bad Now comparing BMP280 to DHT12 without a proper reference such a a high accuracy thermometer is pointless. You know there is a difference but you still don't know who is good or who is bad.

Hdc1080 is even better than BME280 if you don't need the pressure

There are already enough T/HR sensors supported by Tasmota. There's no will to make Tasmota support all sensors available in the world but focus on a few of good sensors that people are OK to maintain.

there is a stable diff of 1°C, which you can easily get rid off by using some offset. that measurement was done to prove that DTH12 is not a random number generator. both sensors are supported by Tasmota, my goal was not about the prove: "okay, we need to support this". I hope it's better to understand now. BR