hello
im rather beggining with arduino and wanted to build a simple
weather station with 3.3V pro mini, LM35 as temperature sensor and 433MHz transmitter.
All powered by 2xAA battery plugged into VCC and GND pins.
The problem is it does not work properly on batteries, arduino LED is on but it does not send data to receiver.
After plugging to RS232 and PC it is working fine.
I tried 3xAA but even arduino LED is not turning on then.
I read about DC/DC converter but I fouded information that it is jamming 433MHz and in result
range of transmission is reduced.
So what should I do if I want for my transmitter circut be powered by batteries?
The transmitter may not run on 3V, and even if it does, the emitted power will be very low.
I tried 3xAA but even arduino LED is not turning on then.
The voltage regulator may have been destroyed by applying ~4.5V to Vcc.
You should remove the power LED and the voltage regulator for low power operation. Use the tip of a hot solder pencil to carefully swipe them off. The operation takes just a few seconds.
thanks for the tip
unfortunately after removing voltage regulator and LED it is still not working on 2xAA bettery pack.
so what's the next best thing to make it working and keep transmitter not plugged into 230V?
jremington:
keep transmitter not plugged into 230V?
means that I want my arduino with transmitter to be powered by some battery, not from AC grid, which in my country is 230V.
Anyway I think I figure it out.
I will use single 18650 li-pol battery with TP4056 for protection against overcharging and discharging.
I read that single 18650 should be sufficient for powering 3.3V 8MHz arduino for many hours.