Water Temperature Arduino GPRS

Messuring water temperature with ds18b20. Sending it all to thingspeak.

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This is ment to be used for swimmers to see what the water temperature is. I live in a city with 4 rivers all clean and nice to take swims in but there is no water temperature info on the internet. I plan to put these sensors in all 4 so i can decide on where to go for a swim. :)

Thx to Mike for in inspiration and some idea on the components.

You can find my test thingspeak feed here:

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muhammad_hafizh wrote 11/06/2017 at 10:18 point

how to display percent capasity  of battery?

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graystevens wrote 08/02/2017 at 22:07 point

Hi Marin,

Is there any chance you could open source/share your PCB design? I'd love to get one printed for a similar project of mine..

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Dylan Sri wrote 04/29/2017 at 02:46 point

Hi Marin,

 I'm working on building a very similar solar-powered / cell network connected / water temperature sensing device, using an Adafruit Feather 32u4 FONA (contains an ATmega32u4 and SIM800H).

Still developing it on the bench. I'm sending it to sleep in between transmissions, but I'm not sure how low the power consumption is.

Do you have any tips for using sleep mode with these components? Did you ever get around to measuring power consumption?


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sergi wrote 12/31/2016 at 11:46 point


First of all, good job :)

I want to create a project similar to this one, but I have a big problem.

I feed the sim800L with lipo battery ( and send commands via Serial from arduino.

First of all I unlock the SIM (AT+CPIN=XXXX) and shield responses OK. Then I can send other commads for example (AT+CBC). But when I try to enable gprs (AT+CGATT=1), or to perform a call (ATD), sim800L return and ERROR, and power off. I think that is a power supply problem, but have the same components like you...

I'm frustrating with this problem. Can you help me?

Thanks a lot.


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Thorsten wrote 09/06/2016 at 13:13 point

Awesome project, using it to build a solar sim800l andrino pro mini sensor. You reference the A6 module, why did you in the end go with the sim800l instead of the A6 module, was it the good power consumtion

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Marin B. wrote 09/06/2016 at 14:05 point

Well the sim800 uses much less power. A6 used a lot more power. Il get around to mesure it.

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