I am looking to add an on/off switch to the asset tracker board. Is this possible? I do not see a V-EN or other type of pin to turn the MicroMod circuit on/off.
I have to use an Adafruit PowerBoost 1000 to get a switch at the moment.
Looks like there is no provision for a switch in its PCB.
There aren’t any PTH holes for one, but you could always wire in a 2-prong switch into one of the battery’s wires
But then it will not charge the battery when plugged in. I am finding a lot of major shortcomings with this board.
The SARA-R510S on the ExpressLink board has GPS disabled. There is another R5 chip that has the GPS enabled. Why would you not use that for an asset tracker? In order to attach an external GPS (i.e. Adafruit Ultimate GPS v3), you need serial comms. But no exposed serial, even though the MicroMod format has it.
Description says this:
Built around the u-blox SARA-R510M8S module, the asset tracker offers Secure Cloud LTE-M and NB-IoT data communication for multi-regional use and has an integrated u-blox M8 GNSS receiver for accurate positioning information.
GPS should be enabled and is handled by the cellular module. Why do you want to shut the unit off? If it’s off it’s not tracking anything.
The AWS ExpressLink version uses the R510S ([link), not the R510M8S with GPS, as with the normal carrier board. It should really be noted in the product description that this asset tracker does not actually track, especially for $185, given that is has populated GPSS antenna port and GPS-related LEDs and such. Very misleading. At least there is a Sparkfun Qwiic GPS module, so I can already continue my project.
The on/off is useful for when I am NOT using the device. If the device is in an enclosure, there is absolutely no way to turn it off when not in use, like when it is sitting at my desk. By cutting the off the battery with a switch, the USB port can no longer charge the battery unless the device is on.](https://www.sparkfun.com/products/18450)
**Where** are you seeing this? I'm seeing that KIT-18450 *contains* a DEV-17272, which is the exact same product as the stand alone board. It seems really odd they'd make two different versions of the same board let alone using a module that doesn't have GPS capability on a board that needs it. I suppose you could connect a qwiic GPS if you absolutely had too but it doesn't make sense that you'd need that. Maybe sparkfun can clarify here?The AWS ExpressLink version uses the R510S (link), not the R510M8S with GPS,
Well, you can't have everything I guess. You could either modify sparkfuns design and roll your own board or you could add an external battery charger like [[PRT-10401](https://www.sparkfun.com/products/10401) and have the on/off switch down stream of that.](https://www.sparkfun.com/products/10401)The on/off is useful for when I am NOT using the device. If the device is in an enclosure, there is absolutely no way to turn it off when not in use, like when it is sitting at my desk. By cutting the off the battery with a switch, the USB port can no longer charge the battery unless the device is on.
https://www.u-blox.com/en/product/SARA-R510AWS-module
The ExpressLink version of the ublox chip does not have GNSS. It should be noted in the listing, especially as it costs more than the standard kit.
I wish I had enough time to learn to build my own PCBs, maybe soon and start my own line of products 
A power switch should not be too terribly difficult to add, however, revising a product is a process.
Thank you for your feedback. I will see what I can do to make the board more usable.