I am looking to transmit a temperature value from a temperature sensor 100 meters away (Line of sight). I have a very low power source ( 3 V - 50 mA) max. I don't care much about the quality of the signal of my frame rate as long as it updates 1 time/second I am new to this and I was wondering if there are any recommendations for the wireless module or any tutorial of something similar.
I am looking for the lowest power-consuming options. the lower the power the better it is. I want continuous transmission until the battery depletes.
One reading per second . . . for how many seconds?
continous. until the battery runs out
Is the 100 meters line of sight or are there obstructions.
So, 30 readings would be OK?
Look at the MySensors.org page. They do a lot with the radio communications. Perhaps you don't want their whole system but there is a lot of good info there.
You might want to reconsider the 1 measurement / second requirement. It can use up a battery pretty quickly. A lot of battery sensors only update if the temperature has changed + once per 15 minutes or so, just to show the sensor is still working.
You can also use something like these they are used for the ubiquitous Acu-rite remote sensor thermometers.
Line of sight
Yes that would be good
my battery might not last for 15 minutes
Over what range of temperatures?
To what degree of accuracy?
Please, be more forthcoming.
20 - 60 C (+-2 degress)
So if the battery lasts for 5 seconds, that is OK ?
Why keep us guessing ?
If you are preapred to reveal what the actual requirements for this 'sensor' are you will get better answers.
1 Like
I am sorry if I am not clear. I am not trying to hide anything. I am just flexible. I have a reading from temperature sensors ( I have not picked) and I would like to send it ~100 meters away. My main issue is I have a (Lab made battery) that provides very low power. As long as my signal is sent and recieved, I am satisfied. I just want to prove that the battery can power such an application. Therefore, the lowest the power of the module the better. 
What is the open circuit voltage and the short circuit current?
OCV = 0.5 V , SCC = 1mA. However, I am connected multiple in series and parallel to achieve 3V and 50mA with a buck-boost converter.
There are a fair number of radio modules that will run on 3V and draw less than 50 mA, including the old standard NRF24L01.
If you want to demo the use of just one cell, consider using a LTC3108 energy harvesting module, which will start on as low as 20 mV.
1 Like
Will that work with a temperature sensor. Do you know of any tutorials ? if you know any other modules please name them so I can read about them.
A thermistor and a 3.3V Arduino Pro Mini would be a good choices. Remove the power LED and voltage regulator from the Pro Mini, and it will run on 2.0V.
Are you suggesting the NRF24L01 as a transmitter and the Arduino as a receiver!
No. You need the Arduino to control the radio and make the measurement.