- Voltage Sensor: I think I can use this?
- 3G/4G module: This is where I'm completely lost. There seem to be many different types out there. The network that I will be using in Bangladesh is Grameenphone. I haven't been able to find much in the way of band frequencies, but one of the Grameenphone modems lists the supported bands as "EDGE/GPRS/GSM 1900MHz/1800MHz/900MHz/850MHz". Is there a module that I can get for the Pi to guarantee a reliable connection?
- Battery Backup: I'm also lost here. I've seen a couple UPS options out there, but I'm not sure if it's possible to have a UPS that can run the Pi for hours, power down gracefully, and reboot the Pi upon restored power. Maybe I'm asking for way too much here.
- Powering the Pi using the 12V battery: I think I'll need a DC/DC converter here? I'm assuming this should be easy given this conversion has to happen for USB adapters in cars.
Is what I'm proposing here too ambitious? I'm a seasoned Linux user, but definitely a noob when it comes to RPis so any help would be useful!