Looks not too complicated! Maybe an SD card is right then.
I was originally going to just take the time currently on the phone and use that as the timestamp, but if I were to do an SD card, I guess I would have to do it a different way.
Add a RTC to the Arduino. You can find a breakout circuit board with an RTC and SD on eBay, perhaps Amazon as well.
RTC is pretty easy too. Arduino IDE has libraries for both the Maxim RTC's
Bad guess.
You want to store the data and process later? Definitely store it locally, and you don't have to manage a program on the phone which would make it difficult.
You may however need to include a RTC for a time reference.
Sounds good, I'll take a look on Amazon and eBay. Thanks!
Alright, sounds like locally is the way to go. I'll look for an RTC on Amazon / eBay. Thank you!
A word of caution: The SD card boards I found do not allow you to have two SPI devices on the same pins. It seems the CS\ does not set the MOSI output to a tri state (high impedance) this causes any other device on the SPI bus to fail.
I was surprised that the Sparkfun and Adafruit had this error in the design, as well as two different boards from eBay.
Its a shame as to "fix" this issue they only had to change the pcb trace on the CS\ pin to the buffer device.
Salt water or fresh? Generally you need low frequencies to propagate RF underwater, and losses are substantial, BT has zero chance I think, even in fresh water at short range.
#4, #8, #14
Most likely both. Looks like wired is definitely the way to go. Thanks for your feedback.
That's unfortunate. Worst comes to worst, I do know a bit of Swift, so I'm hoping storing data on a phone isn't too bad.
But they work find if only one SPI device.
If you need 2 SPI:
There is a fix but its a little tedious:
- Lift the leg of pin #13 the hc125 IC.
- connected the lifted leg to IC Pin#8
See below:
Are there pressure-temperature combo sensors?
If not, that looks pretty complex... having no experience, I don't want to break anything, so maybe I'll have to use a phone.
I'm really not trying to push the SD but I just went through this not too long ago.
If you use a DS3231 RTC + SD board and a Bosch BMP-280 Pressure Temperature sensor, you will not have to make the jumper fix.
The jumper fix is only if you use two SPI devices on the same bus.
Ohh ok I totally didn't understand what SPI was lol. Then if I don't need to make that mod, then I'll definitely go the SD route. Thanks!
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