Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




6358 posts

Uber Geek

Moderator
Trusted
Lifetime subscriber

# 165722 18-Feb-2015 13:17
Send private message

After just about losing a whole fridge worth of stock, I've decided I need to monitor the three fridges and one freezer we have at the cafe.

I don't need anything too fancy, as long as it has an output that I can consume, I can write a program to alert me when they fall outside the norms.  Monitoring hardware needs to be WiFi.

Was thinking about these, however, am happy to take suggestions on anything else that people have used.

Create new topic
4533 posts

Uber Geek

Trusted

  # 1241677 18-Feb-2015 14:37
Send private message

What's that thing Ben Gracewood is using.  Might be a bit overkill though and prob IOS only (the one and true OS)




Previously known as psycik

OpenHAB: Gigabyte AMD A8 BrixOpenHAB with Aeotech ZWave Controller, Raspberry PI, Wemos D1 Mini, Zwave, Xiaomi Humidity and Temperature sensors and Bluetooth LE Sensors
Media:Chromecast v2, ATV4, Roku3, HDHomeRun Dual
Windows 10
Host (Plex Server/Crashplan): 2x2TB, 2x3TB, 1x4TB using DriveBender, Samsung 850 evo 512 GB SSD, Hyper-V Server with 1xW10, 1xW2k8, 2xUbuntu 16.04 LTS, Crashplan, NextPVR channel for Plex,NextPVR Metadata Agent and Scanner for Plex


3885 posts

Uber Geek

Subscriber

  # 1242046 19-Feb-2015 01:33

What kind of alarm system do you have? As if you have an unused zone input. Connect it up to a thermostat. And configure the panel to contact you if a temperature alarm condition happens.

Also from reading 1 of your blog posts Im guessing you have good coding knowledge? So then the best thing would be to get an Arduino board and a Wifi Shield. That way you will have plenty of inputs so as well as monitoring temps. You can also monitor things like compressor run time, Status of condenser high or low pressure switches, If the power has failed. That way you will know immediately if a refrigeration system failure has occurred. Instead of only finding out when temperatures are out of range.





 
 
 
 




6358 posts

Uber Geek

Moderator
Trusted
Lifetime subscriber

  # 1242084 19-Feb-2015 08:27
Send private message

Aredwood: Also from reading 1 of your blog posts Im guessing you have good coding knowledge? So then the best thing would be to get an Arduino board and a Wifi Shield.


Sounds like an awesome idea, I'm assuming I'll also need some sort of temperature sensor to plug into the Arduino?

15247 posts

Uber Geek

Trusted
Subscriber

  # 1242092 19-Feb-2015 08:43
Send private message

Seen this?

3885 posts

Uber Geek

Subscriber

  # 1242347 19-Feb-2015 14:39

nate:
Aredwood: Also from reading 1 of your blog posts Im guessing you have good coding knowledge? So then the best thing would be to get an Arduino board and a Wifi Shield.


Sounds like an awesome idea, I'm assuming I'll also need some sort of temperature sensor to plug into the Arduino?




Either get https://nicegear.co.nz/sensors/10k-precision-epoxy-thermistor-3950-ntc/ Which will need 1 analogue input per sensor to work. Or https://nicegear.co.nz/sensors/waterproof-ds18b20-digital-temperature-sensor/ These with the right code can be daisy chained together. So lots of sensors on 1 I/O pin. (and have plans to add more)

I have a system running with 9 of the DS18B20 sensors on just 1 I/O pin. Although if you only need a small number of sensors then use the thermistor sensors instead.





22529 posts

Uber Geek

Trusted
Subscriber

  # 1242410 19-Feb-2015 15:25
Send private message

Stick with the DS sensors. I got several off ebay that are nicely potted into a piece of stainless that I have in my aquarium to keep an eye on it. I pulled the Pi off it as I wanted to use it somewhere else but there are a crapload of python tutorials on using them on the pi and then hitting up servers with the readings.

The thermistor ones have issues with the odd really out reading from noise when I tried one, like it would be 28, 28, 29, 28, 70, 28 when reading periodically. The DS ones dont seem to do that.




Richard rich.ms

3267 posts

Uber Geek

Trusted

  # 1242669 19-Feb-2015 22:20
Send private message

Thermistors will be prone to noise pick-up (as Richms said), but not if you use proper (hardware) filtering and (appropriately) shielded wire.  The DS sensors however are just so much better in being calibrated and digital.




You can never have enough Volvos!


 
 
 
 




6358 posts

Uber Geek

Moderator
Trusted
Lifetime subscriber

  # 1323362 12-Jun-2015 13:25
Send private message

I ended up with these from Wireless Sensor Tags.  Cost me around NZ$250 for 5 sensors and a base station.

Pretty impressed so far, you can set alarms if the temp goes outside a particular range.  Also has a nice mobile app.  I'll try and blog it about when I get a chance.

2048 posts

Uber Geek

Subscriber

  # 1323410 12-Jun-2015 14:17
Send private message

Interesting collection of sensors.

Create new topic



Twitter and LinkedIn »



Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Arlo unveils its first video doorbell
Posted 21-Oct-2019 08:27


New Zealand students shortlisted for James Dyson Award
Posted 21-Oct-2019 08:18


Norton LifeLock Launches Norton 360
Posted 21-Oct-2019 08:11


Microsoft New Zealand Partner Awards results
Posted 18-Oct-2019 10:18


Logitech introduces new Made for Google keyboard and mouse devices
Posted 16-Oct-2019 13:36


MATTR launches to accelerate decentralised identity
Posted 16-Oct-2019 10:28


Vodafone X-Squad powers up for customers
Posted 16-Oct-2019 08:15


D Link ANZ launches EXO Smart Mesh Wi Fi Routers with McAfee protection
Posted 15-Oct-2019 11:31


Major Japanese retailer partners with smart New Zealand technology IMAGR
Posted 14-Oct-2019 10:29


Ola pioneers one-time passcode feature to fight rideshare fraud
Posted 14-Oct-2019 10:24


Spark Sport new home of NZC matches from 2020
Posted 10-Oct-2019 09:59


Meet Nola, Noel Leeming's new digital employee
Posted 4-Oct-2019 08:07


Registrations for Sprout Accelerator open for 2020 season
Posted 4-Oct-2019 08:02


Teletrac Navman welcomes AI tech leader Jens Meggers as new President
Posted 4-Oct-2019 07:41


Vodafone makes voice of 4G (VoLTE) official
Posted 4-Oct-2019 07:36



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.


Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.