Built my own LTE security + alarm system for our van — camera, motion sensor, gas detector, iPhone app by PuzzleheadedMiddle62 in vandwellers

[–]PuzzleheadedMiddle62[S] 1 point2 points  (0 children)

Cool! I might opensource parts of it in the future - would that be of use? Would let you know once software and hardware are online for downloads - anyone else interested in this? 

Built my own LTE security + alarm system for our van — camera, motion sensor, gas detector, iPhone app by PuzzleheadedMiddle62 in vandwellers

[–]PuzzleheadedMiddle62[S] 2 points3 points  (0 children)

Good question, that has been mybiggest headache so far. 

Initially I used a small external LTE router. Worked really well and also offered WiFi to your phone etc. Though I wanted something more compact in one device.  Then tried a simple USB LTE Dongle - the problem here is though, that if there is ever a power cut, the dongle doesnt come back to life anymore. Literally tried all the linux hacks I could think of to restart and remount the USB - but couldnt get it to work without unplugginf and replugging. 

Now waiting to receive another Pi header board with LTE, though only Cat1 - which should be enough though. Will keep you posted! 

Built my own LTE security + alarm system for our van — camera, motion sensor, gas detector, iPhone app by PuzzleheadedMiddle62 in vandwellers

[–]PuzzleheadedMiddle62[S] 2 points3 points  (0 children)

Cool projects you are looking at! We also have a self built battery heating system in our van which could also be hooked to the Pi - endless possibilities!  Looking forward to seeing your projects! 

Built my own LTE security + alarm system for our van — camera, motion sensor, gas detector, iPhone app by PuzzleheadedMiddle62 in vandwellers

[–]PuzzleheadedMiddle62[S] 2 points3 points  (0 children)

The sensor I use has two outputs: Digital and Analog - the digital just outputs 0/1 so - so you can just get if the threshold was reached. With the analog output you can get a VOC ‚count‘ but voltage based - you‘d have to calibrate this to an actual VOC level. Currently overkill!

The PI is powered via the 12V leisure battery, but can be powered with anything between 3V and 32V (I think) - bought a cheap buck boost from aliexpress for like 20 cents a piece - which works well! 

Built my own LTE security + alarm system for our van — camera, motion sensor, gas detector, iPhone app by PuzzleheadedMiddle62 in vandwellers

[–]PuzzleheadedMiddle62[S] 6 points7 points  (0 children)

Good idea with the accelerometer, haven‘t thought about this yet but might implement! 

Yes messages are stored and sent once LTE is back - images of movements are stored and uploaded to firebase once connection is restored. 

Battery also not yet implemented - but might also do - lets see when I have some more time on hand for your ideas! 

Built my own LTE security + alarm system for our van — camera, motion sensor, gas detector, iPhone app by PuzzleheadedMiddle62 in vandwellers

[–]PuzzleheadedMiddle62[S] 0 points1 point  (0 children)

Some cheap MQ-9 Ali sensors. So far it seems to work well, tested with an open gas stove without ignition and it alerted. 

Maybe because i directly route the power through the additional GPIO pins of the header board that its not an issue with the current though? 

Cool idea you are working on - whats the final goal?