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nielsonm236 / NetMod-ServerApp

Reprogramming the Web_Relay_Con V2.0 HW-584 Network Module
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dht11/22 temperature and humidity sensor #61

Open atilim07 opened 3 years ago

atilim07 commented 3 years ago

hello if I ask Can you integrate dht11 temperature and humidity sensor module?

nielsonm236 commented 3 years ago

I've looked at the DHT11 spec and the short answer is "Yes". The longer answer:

In the meantime:

atilim07 commented 3 years ago

i plan to run dht11 on single pin thanks in advance for the improvements

nielsonm236 commented 3 years ago

Another user has requested the DHT22. That is a more precise version of the DHT11, and uses the same IO interface. So, if either is implemented both will work. I have ordered DHt11 devices to experiment with. Still don't know if it will fit in code.

nielsonm236 commented 3 years ago

Even though I've ordered DHT11 devices for some experiments with this feature I'm starting to have doubts that this is a good way to go. The DHT11/22 devices can only be attached on dedicated pins ... no means of attaching more than 1 without sacrificing more pins. I found an alternative device (based on the AHT10) that connects with I2C. If I2C connectivity is used that then allows the connection of multiple sensors and other devices without using more IO pins. For those that requested this feature would this be of interest? This link is an Amazon offering of the device. https://www.amazon.com/AITRIP-Precision-Temperature-Measurement-Communication/dp/B08SGBHJHD/ref=sr_1_8?dchild=1&gclid=CjwKCAjw1uiEBhBzEiwAO9B_HS3SyPkAhlpw4TcSDGC9bG-r4xKBBelefrxeBWiP-6PIsrfGvnCd_xoC9R8QAvD_BwE&hvadid=238245127404&hvdev=c&hvlocphy=1014452&hvnetw=g&hvqmt=e&hvrand=3353284741077870345&hvtargid=kwd-316322552610&hydadcr=18063_9813246&keywords=i2c+temperature+humidity+sensor&qid=1620770365&sr=8-8

caladeira commented 3 years ago

Hi to all,

I might have another suggestion: BME280 This sensor provides temperature, humidity and pressure. It uses I2C but can also use SPI interface.

https://pt.aliexpress.com/item/1005002422171343.html?spm=a2g0o.productlist.0.0.38842a39gObY2V&algo_pvid=05bc92da-63b4-4a77-8e5d-32cd21679d25&algo_expid=05bc92da-63b4-4a77-8e5d-32cd21679d25-0&btsid=0bb0624416208259044007443e4819&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

On Wed, May 12, 2021 at 2:01 PM nielsonm236 @.***> wrote:

Even though I've ordered DHT11 devices for some experiments with this feature I'm starting to have doubts that this is a good way to go. The DHT11/22 devices can only be attached on dedicated pins ... no means of attaching more than 1 without sacrificing more pins. I found an alternative device (based on the AHT10) that connects with I2C. If I2C connectivity is used that then allows the connection of multiple sensors and other devices without using more IO pins. For those that requested this feature would this be of interest? This link is an Amazon offering of the device.

https://www.amazon.com/AITRIP-Precision-Temperature-Measurement-Communication/dp/B08SGBHJHD/ref=sr_1_8?dchild=1&gclid=CjwKCAjw1uiEBhBzEiwAO9B_HS3SyPkAhlpw4TcSDGC9bG-r4xKBBelefrxeBWiP-6PIsrfGvnCd_xoC9R8QAvD_BwE&hvadid=238245127404&hvdev=c&hvlocphy=1014452&hvnetw=g&hvqmt=e&hvrand=3353284741077870345&hvtargid=kwd-316322552610&hydadcr=18063_9813246&keywords=i2c+temperature+humidity+sensor&qid=1620770365&sr=8-8

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nielsonm236 commented 3 years ago

Wow - now that's interesting. Very inexpensive and much more accurate.

nielsonm236 commented 3 years ago

Jose Vieira discovered some information that shows we've got to be careful about these sensors. At a minimum we want a temperature + humidity sensor. Having barometric pressure would be a plus. But: BME280 measures temperature, humidity, and barometric pressure BMP280 measures temperature and barometric pressure (but not humidity) AND - many vendors don't know what they are selling and mis-identify the product. In general the BME sensor is more expensive. See these links: https://goughlui.com/2018/08/05/note-bosch-sensortec-bmp280-vs-bme280-sensor-confusion/ https://www.meteocercal.info/forum/Thread-Bosch-Sensortec-BMP280-vs-BME280-Sensor-Confusion https://imgur.com/jnMkxKy

caladeira commented 3 years ago

I have a few bme280 and bmp180 (older version).

Nothing better than the devices datssheet:

https://cdn-shop.adafruit.com/datasheets/BST-BMP280-DS001-11.pdf https://cdn-shop.adafruit.com/product-files/2652/2652.pdf

On Fri, May 14, 2021 at 3:54 PM nielsonm236 @.***> wrote:

Jose Vieira discovered some information that shows we've got to be careful about these sensors. At a minimum we want a temperature + humidity sensor. Having barometric pressure would be a plus. But: BME280 measures temperature, humidity, and barometric pressure BMP280 measures temperature and barometric pressure (but not humidity) AND - many vendors don't know what they are selling and mid-identify the product. In general the BME sensor is more expensive. See these links:

https://goughlui.com/2018/08/05/note-bosch-sensortec-bmp280-vs-bme280-sensor-confusion/

https://www.meteocercal.info/forum/Thread-Bosch-Sensortec-BMP280-vs-BME280-Sensor-Confusion https://imgur.com/jnMkxKy

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sjorsBe commented 2 years ago

Is there room for support of an PCF8574? It would make the use of extra pins configurable…

kr

sjors

nielsonm236 commented 2 years ago

@sjorsBe Please open the PCF8574 question as a new Issue. I'll answer there. Thanks Mike