![]() ![]() The tags and hubs were very expensive (hundreds of dollars) and, due to technical issues with their technology, they never worked as designed for my application. I am an early backer of the Sensor Tags from CAO Gadgets, LLC. If you can’t wait for Tempi.fi to offer their Wi-Fi gateway, there’s another option available now, although you’ll spend a little more for it. However, the company says it is working on a Wi-Fi gateway to make the sensor data available away from home. Just remember that the data synchronization is only when your phone is within the very limited range in this case. It can also store up to 22 days of sensor data locally. It measures temperature and humidity every minute and can send that data to your phone. The first option worth considering is a Bluetooth sensor from Tempi.fi, which costs $50. On the other hand, sensors that use some type of proprietary network over unlicensed spectrum typically do have a hub device, which gets the sensor data on to the internet, typically over Wi-Fi, to support remote alerts and monitoring. ![]() That means remote monitoring information is only viewable when your phone is within range of the sensor, which probably isn’t ideal for what Johnathan is looking to do. Additionally, most Bluetooth sensors only connect to a phone for data and alerts. That also can limit the range of data communications. Many of these sensors use Bluetooth to send data because it’s more power-efficient than Wi-Fi, for example and can run on batteries. And you’ll want that bridge or hub close to the appliance because even if wireless signals can “escape” the freezer, they won’t go far. As a result, you’re probably best off with a wireless sensor that communicates with some internet-connected bridge or hub. The way these appliances are built, they’re really good at blocking wireless signals. Using these sensors in a freezer or a refrigerator adds a challenge that outdoor usage doesn’t. This is a fairly common question we get, with regards to people wanting alerts if freezer temps start to rise, indicating some power or mechanical issue. Johnathan called in and asked about wireless sensor tags that can monitor temps in a freezer or outside. On our most recent IoT Podcast episode, we shared a question from our voicemail hotline about temperature sensors. ![]()
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