Hi everyone,
I am using an arduino and two sensors with a 9V battery, the problem is that in one day the battery is descharged so I have been thinking to use a rechargable battery.
I would like to use like a mobile phone battery (5V power bank) with 10000 mAh, do you think is it the best option? Do you recomend me something else?
I would like to ask you as well, if I connect the batteri directly to the arduino, can I use the arduino connector to charge the battery?
Thanks in advance.
Which Arduino? Which sensors? Could you benefit from sleep mode with a board without the USB interface chip?
MarkT:
Which Arduino? Which sensors? Could you benefit from sleep mode with a board without the USB interface chip?
It is the Arduino uno, and the sensors are one servo mini, sg90 and one fingerprint gt511, in its datasheet they write it use 130 mA. Do you think I can use a sleep mode with the fingerprint? The fingerprint should be always open because it should recognize the finger.
The fingerprint should be always open because it should recognize the finger.
No, you can have a proximity sensor and only turn on the fingerprint sensor when someone approaches. These run a lot less current than your sensor.
Grumpy_Mike:
No, you can have a proximity sensor and only turn on the fingerprint sensor when someone approaches. These run a lot less current than your sensor.
It is expensive and it occupy lots of space. I don't have lots of space so I prefer not to use the proximity sensor. IN any case I cuold try to use the Arduino sleep mode even if yet I don't know how to program it.
It is expensive and it occupy lots of space.
What is? Proximeter sensors can be very small and cheap.
IN any case I cuold try to use the Arduino sleep mode even if yet I don't know how to program it.
Yes but you have to wake it up somehow once it is asleep. How is that going to happen?
Grumpy_Mike:
What is? Proximeter sensors can be very small and cheap.
Could you post here some reference, link or something about a small and sheap proximity sensor....I don't know lots of them.
Something like this:-
from here
Or this Standalone 5-Pad Capacitive Touch Sensor Breakout - AT42QT1070 : ID 1362 : $7.50 : Adafruit Industries, Unique & fun DIY electronics and kits, you don't have to actually touch it if you get the thresholds in the chip correct. Or even surround the sensor with a wire so you have to touch it when you have your finger on the sensor.
or something about a small and sheap proximity sensor
However sheep sensors are not so common, here is one I came across sheep sensor
Would you like to stay on autonomous source? Or do you think on network adapters as well?
On the market there are small 6V lead batteries (for some motorcycles, PC backup power or alike) that may fit your needs. They are heavy and bulky. But not so expensive.
Seen from that any LiIon Battery has a limited number of charging-discharging cycles and the LiIon cell are of variable quality, small Lead batteries may worth a look.
I do not know how good they are in your case. I use one for a photo-voltaic panel, and for this purpose it is OK.
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I found useful to measure the source voltage time by time, while modifying the prototype circuits. I use (shame on me!) the multi-meter but there are 2 USD panel-voltmeters available on the market. I am going to mount one of them to my breadboard source (adapter) just to keep following the voltage. I shall see how good it is.
you can have a proximity sensor and only turn on the fingerprint sensor when someone approaches
or you could just get a motion sensor. Or an ultrasonic sensor. the ultrasonic sensor measures distance(proximeter sensor), and is about as big as a 9v battery, in width, thickness, and length. a motion sensor is smaller. Here's a few links:
here are some ultrasonics on amazon, If you'll want more than one in the future, buy in bulk. It saves money (look at the first item in the link, and the 11th).
https://www.amazon.com/s?field-keywords=arduino+ultrasonic
motion sensors (just so you know, it's often cheaper to order off amazon than the Arduino store itself. Don't tell them I said that 
).
go to amazon.com and search for 'Arduino motion'.