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Coming...from a planet closer to home


#1

IoT Labs Earth

Meant to be used as an inside sensor. Sensors to be mounted on expansion board.

STM32F412
WGM121 Bluetooth
1/2 AA Battery
.NET 4.4


#2

PCB must be blue ;D


#3

@ munderhill - What is 1/2 AA bat?

How about a coin cell?

BGM121 Bluetooth, why not put BT5 on there? I bt4.2 doesn’t have the distance to reach the gateway that is down the hallway or on the floor above.

How about adding SiLabs Proprietary 915 wireless radio for greater distance?

I need an IOT device that runs on coin and has great distance on radio to get back to a gateway.


#4

@ Terrence - Why Coin? Does it need to be round? Or just a certain physical size?


#5

@ terrence - See attached photo of 1/2 AA size battery, 3.6v 1200mAh, much more capacity than a coin cell. I corrected a typo on the Bluetooth module I am using, it’s the SiLabs WGM121 http://www.silabs.com/products/wireless/bluetooth/bluetooth-low-energy-modules/bgm121-bluetooth-sip-module. I chose this module, because I have already written a driver for the WGM110 (WiFi) module that uses a similar API.


#6

@ Justin - No reason, I am just interested in small size, low energy action. The holy grail of IOT “runs for years on a coin sized battery”.


#7

@ munderhill - who knew that a 1/2 AA was a 1/2 AA battery? :whistle:


#8

@ Terrence - I guess to be completely accurate it is a 14250 type battery.


#9

@ munderhill - Sorry, I wasn’t implying you were not giving me enough info. I had just never encountered a 1/2AA and the name says it all, so I needn’t have asked.

Thanks.


#10

@ munderhill - How about an update on what you have been up to lately.

Not much discussion from our great board developers.


#11

@ Terence - So, I got the Earth board built, but my development PC crashed and just got the motherboard back a few days ago. I have at least twos issue with the current board layout. The Earth circuit works (verified by a Blinky app), so after vacation (2 weeks in Europe) I will start working on the Bluetooth driver. Once that is done, I’ll fix the layout issues. I’ve also got some work to do on the WGM110 WiFi module driver.


#12

Bluetooth driver? So are you considering adding a nRF52840 (not the nRF52832) for Bluetooth 5’s super long range, super low power for a radio?

Thanks for the update.


#13

@ terence - I am using BGM121(http://www.silabs.com/products/wireless/bluetooth/bluetooth-low-energy-modules/bgm121-bluetooth-sip-module) for small size


#14

Interesting, SiLabs is here in Austin. I have been over to their offices for an IOT hardware meetup.