Wireless temperature sensors

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Disrespective

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#1590953 13-Jul-2016 13:12

There are some write ups on how to make a multi sensor with DHT11 hardware on www.mysensors.org

I have a few of these which are quite good, too. www.wirelesstag.net

They do require an active internet connection to store the data on the 'cloud' but i'm starting to think about sniffing this and storing it locally. It can't be THAT hard... right...?

t0ny

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#1590977 13-Jul-2016 13:52

Disrespective:

There are some write ups on how to make a multi sensor with DHT11 hardware on www.mysensors.org

I have a few of these which are quite good, too. www.wirelesstag.net

They do require an active internet connection to store the data on the 'cloud' but i'm starting to think about sniffing this and storing it locally. It can't be THAT hard... right...?

the wireless tags sound like a good idea. Pity the shipping seems expensive

Disrespective

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#1590979 13-Jul-2016 13:57

t0ny:

the wireless tags sound like a good idea. Pity the shipping seems expensive

Yeah, USD$50 isn't cheap. You are limited to about 6 sensors before you get up to the NZD400 import limit. I figure you could save some if you used a mail forwarder and were prepared to wait a bit longer, but it's still USD$10 to ship to the forwarder, and then maybe NZD$30 more (at the most) to get them to NZ, and our dollar was doing OK when I bought mine so figured i'd just pay the $50 and get them quick.

olivernz

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#1590990 13-Jul-2016 14:09

I suggest an ESP8266 (module ESP-12F and ebay/aliexpress is your friend) with a DHT12 (better version of DHT11) or DHT22 or a DS18B20 (if you don't need humidity). A little development in Arduino IDE might be needed but that's pretty simple. There is also a ready made 220V module from Electrodragon (search their site for ESP8266) that goes for $6 + shipping (just needs the sensor soldered in). Can't get cheaper than that! There are tons of Instructables on the internet on how to do this.

olivernz

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#1590992 13-Jul-2016 14:11

Oh and yes, I have all this running at home quite successfully.

Come to think of it I have an Electrodragon and sensor left that I could sell you. Probably comes to just under NZ $20.

mentalinc

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#1591007 13-Jul-2016 14:22

davidcole:

I've just put a DHT11 Sensor on a Raspberry pi I had spare. Not currently wireless but it could be, and then I added a python script to talk to Maker which updates a google drive spread sheet every 10 mins.

Then I added a second script to output to ThingSpeak.com so it can make some pretty graphs for me.

The APIs for both were pretty simile and took < 10 mins each to get going.

Can you please share more details? Very keen to trial this as an easy starting point. Where did you get the DHT11 in NZ?

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#1591012 13-Jul-2016 14:28

mentalinc:

davidcole:

I've just put a DHT11 Sensor on a Raspberry pi I had spare. Not currently wireless but it could be, and then I added a python script to talk to Maker which updates a google drive spread sheet every 10 mins.

Then I added a second script to output to ThingSpeak.com so it can make some pretty graphs for me.

The APIs for both were pretty simile and took < 10 mins each to get going.

Can you please share more details? Very keen to trial this as an easy starting point. Where did you get the DHT11 in NZ?

I didn't. I used aliexpress. They were about $4USD each I believe. Came with a 120mm 3 wire cable (Dupont crimp it's called I've since learned). So Also on Aliexpress I bought some longer dupont crimpped cables (cheaper than buying a crimp and didn't feel like cutting and soldering).

Then once connected - I''ve kept the page somewhere, there was a github clone to do to pick up the Adafruit Python DHT driver. Once that compiled it didn't take much to take their example page and hack together a json string to upload to either Maker (for google drive) or ThingSpeak.

Edit: Added picture.

The UPS details are from Nut-CGI. I just added the ThingSpeak embeddable image to the page.

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