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February 6, 2014
about 9 months ago
the perfect solution for my project ... Almost! Was going to order several, now none.
please provide datasheet of the on-board mosfet . schematic indicates that the mosfet on board is spec'd at 1.1Amax
I'm assuming the 600mOhm is the Rds-ON which is much too high for my application. maybe that's a mis-print?
My project is a low power, sleeps most of the time, wakes once per hour to take a data sample and transmit. However, during transmit, my board peaks >2A @ Vbat. If Rds is 600mOhm the voltage drop thru this board will be 1.2V which will put the voltage to the application board lower than brown-out. (also, there's likely additional diode voltage drop thru the mosfet which will make the application voltage even lower!)
Idea for next-gen version of this product:
pair the TPL5110 nano-power timer with a more useful MOSFET, perhaps a N-mosfet that has very-low Rds-ON, or higher current capability P-channel?. I can see more applications if this product could switch more power.
about 5 years ago
anybody used one of these outdoors in sunlight? how readable is it? also is it usable in cold temperatures? esp. compared to LCD or other LED displays.
about 5 years ago
well ... why has it taken so long?! Finally! a wifi module to add to small projects that doesn't cost more than the all the other components! This breaks some barriers.
about 5 years ago
Got my SIM today. Inserted it in an old 3G Gobi/Qualcomm Netbook and got it to connect by using APN=epc.tmobile.com (AT+CGDCONT=...)
Don't know what the "official" APN to use is ... SparkFun?
Haven't tried any speedtest.net, but probably I couldn't help answer what T-Mobile 4G really is, since I don't have a 4G/LTE device (modem, router, etc), and I'm not sure what T-Mobile actually advertises in this coverage area.
Thank you SparkFun and TMobile! ... Just ordered one.
(I'm hopeful (hint.hint) that just maybe sparkFun is cooking something up to offer a reasonably priced cellular hardware+service package that is easily integrated into uC-sized pacakges, and could be a feed to phant.io (sparkFun's "cloud" data service) or my own back-end.)
I have soooo many projects that need wireless (cellular) remote data transfer, but they're low volume (100s of units), low-priced ($100s devices), low data volume (<50MB) and speed requirements... hard to justify the cellular data transfer when the cost of comms.hardware is 10x more than the cost of the device itself, and then to add $50/month service per device ... I can't sell that.
Looking at your available cellular module SM5100B and BoB too pricey at ~$120 and from comments seems a bit iffy. Why can't there be an offering in the $50 range, small, simple, and stable availability (10+ year lifecycle). And then add a reasonably priced (<$10/mon) service plan from the carrier (T-Mobile/ AT&T / VZW) ... only need 3G or less speeds, and low volume (<50 MB per month) ... why pay for 10GB??? $50/mon?
Enabling the smaller embedded sensors with cellular service, will drive the Internet of Things (IoT) ... (billions of devices/sensors sending data)
No public wish lists :(