Hello
I am using arduino pro mini 3.3v for my project.
what is the minimum voltage supply for the arduino?
i tried to supply 3.3v from USB TTL but arduino is not turning on properly.
What is a "USB TTL" and what makes you think it will supply 3.3V?
Steve
I measured from multi-meter. it is giving 3.2V and from vcc pin of USB ttl it is showing 3.5V
Are you by chance talking about a USB to TTL converter? Like FDTI?
Mind that not only Vcc is at 3.3V, but also your logic levels or you could still fry it.
Powering a 3.3V Pro Mini from the RAW input would need aroung 4.5V. There is no definative answer since the voltage regulator used on a Pro Mini can vary and different regulators have different voltage drop out specifications.
You can sometimes power the Pro Mini from a USB to serial adapter that is set to 3.3V, but then some of these may only be capable of supplying 50mA or less and you can find the Pro Mini is reseting all the time, so it appears not to run.
Thank you.
My question was will arduino pro mini will work with 3v battery?
If not what is the minimum voltage supply for arduino pro mini when volatge regulator is removed
The ATmega328p is rated to run at voltages as low as 1.8V provided you bring down the clock speed to 4 MHz. At 8 MHz you need at least about 2.4V, which is what you get when your 2xAA alkaline batteries are just about drained.
Thank you.
Now my device is working but it is consuming more power can someone please check the code and help me solve the issue.
i have removed arduino pro mini power led it is consuming ardound 20mAh
proj_transmitter.ino (8.19 KB)
bmg1234:
Thank you.My question was will arduino pro mini will work with 3v battery?
If not what is the minimum voltage supply for arduino pro mini when volatge regulator is removed
First time you have mentioned using a 3V battery .........
Remove the regulator and yes you can, but all the 3.3V Pro Minis I have had are set for a brownout voltage of 2.7V, if you want to use 3V then you probably want to use an ISP programmer to set the brownout fuse to 1.8V.
bmg1234:
Now my device is working but it is consuming more power can someone please check the code and help me solve the issue.
I suggest you remove all devices and change the program so that its just the Pro Mini that is going to sleep.
Then measure the current.
Debug such setups in easy manageble steps.
srnet:
First time you have mentioned using a 3V battery .........Remove the regulator and yes you can, but all the 3.3V Pro Minis I have had are set for a brownout voltage of 2.7V, if you want to use 3V then you probably want to use an ISP programmer to set the brownout fuse to 1.8V.
device is transmitting data with two 1.5v aa batteries. if i use one 3v coin battery with capacity of 175mAh then data will transmit for one minute then again it stops. if i reset the device again it will start transmitting data. this problem is not with aa batteries
The coin battery apparently can't supply enough current for your transmission. From the code you posted I deduce you use an RF24 radio, those things need some 15 mA when transmitting, which by itself is about the limit a 3V coin battery can supply. The Arduino also needs some power to continue running.
This will result in voltage drops, and then you can get all kinds of unexpected results, such as things working for a short while only.
wvmarle:
The coin battery apparently can't supply enough current for your transmission. From the code you posted I deduce you use an RF24 radio, those things need some 15 mA when transmitting, which by itself is about the limit a 3V coin battery can supply. The Arduino also needs some power to continue running.
This will result in voltage drops, and then you can get all kinds of unexpected results, such as things working for a short while only.
But i am using 250mAh coin battery but still the same issue.
what must be the minimum amperes?
Capacity (mAh) and current (mA) are two different things.
Check the data sheets of all the individual components in your project and find the peak current they draw.
Thank you, I understood now.
How to check remaining current in the battery?
consider that i am using 3.6v battery which is 1200mAh. after one hour i need to check what is the remaining mA in the battery. Are there any simple devices to check?
That's normally done by continuously measuring the actual current drawn (in mA), multiplying that by time to get to mAh, and based on that you estimate the remaining charge.
You can also look at the battery voltage, then you can get as detailed as "full", "half full", "nearly empty". Well, maybe four levels, like your run-of-the-mill powerbank offers.