I am thinking of making my own UHF tracking transmitters for a wildlife study.
Could I just connect a low power microcontroller to the Vcc part of this circuit http://www.instructables.com/id/Tiny-UHF-Tracker-Transmitter/ (e.g. Attiny85) and program it to turn the transmitter on after 10 days for a couple of hours every afternoon only (i.e. during the time when I'm searching for the transmitters)?
Or are there other considerations I haven't thought of here. I'm very unfamiliar with radio. If someone has other suggestions on how to significantly increase the battery life that would also be useful. I need to keep everything less than 2g (lighter is better).
My plan is to also have a temperature sensor and store temperature data on the Attiny. The main purpose I have for the transmitters would be to find the animals at the end of the study to retrieve the sensors rather than to track the animals so it would not need to be working continuously.
Possibly this is an obvious question and it would work fine, but it will be a lot of work so just wanted other opinions in case someone can see that it won't work or can suggest a simple and better way to increase the battery life.
Really appreciate any help, thanks!!