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. :)
Well here is how it currently looks. The case is watertight. My plan is to mount it on a tree close to the water and then just drop the sensor probe into the water. Im still searching for a on the water buoy that can possibly hold the whole setup.
Remeber that first project log. Well the board i made for that prototype arived and i assembled it.
Soldered the arduino mini pro 3.3v as close as i can to the board. Did the same for all other components.
R1 is ment to be used as the 4.7K Resistor for the DS18B sensor between vcc and data. Other resistors are soposed to be a voltage devider but i dont need it since i can get the voltage in mV with AT+CBC from the gsm module.
Chepo ebay TP4056 charge module. I made the board for the one that has battery protection but this one fits to as the other one did not arrive yet.
Remove this resistor to enable software powering on and off for the gsm module.
Thats it for now. Will try it out. The SIM800l module may be better in a way of power usage.