To supply power to Arduino WI Fi sheild Using 9V Battery

Other Hardware General Electronics
1

hi,
As i am new to Arduino. i have a basic question, I have an Arduino UNO and Arduino Wi-Fi sheild. I mounted Arduino Wi-Fi sheild on top of Arduino UNO and used usb cable to supply power. Now , i want to connect 9V battery to Supply power to Arduino UNO and Arduino Wi-Fi sheild. should I connect 9V Battery Positive and negative to Vin and GND of Arduino Wi-FI sheild respectively or any other way ?

Thanks in advance................................

2

The wifi shield is powered by the 5V of the Arduino Uno board.

You can connect a power supply to the DC jack of the Arduino Uno.
A 9V battery will not last very long, it might not even work.

3

hi,
Thanks for your response. can i use 9V battery and 9V battery clip (snap connector), a DC Jack for supplying power to arduino.

http://playground.arduino.cc/Learning/9VBatteryAdapter#.UwLNhmKSy14

Will this work ?

4

Without the wifi shield it will work. The wifi shield might need too much current for a normal 9V battery.

5

Normal 9v batteries are not designed for large(ish) current draws like this. 9v is ok in itself, but not really from those small batteries, they are designed for long small currents as found in smoke alarms etc.

Rob

6

hi ,
sorry for late reply....... please suggest me best way for supplying power to arduino wifi sheild which is mounted on arduino uno other than powering it using USB from the PC.

7

Do you want the UNO powered by the USB and the shield powered from a different supply?

8

i want to supply power to both arduino uno and wifi sheild with out using USB form PC.

9

Use a regulated power supply of 7.5 to 9V for the DC jack plug of the Uno.
When you use a cheap wall wart, you have to be careful and measure the voltage before you use it.

10

In Reply# 1, you mentioned that 9V battery might not work.

11

Now he is saying "Use a regulated power supply", can you not see the difference?

It's not the voltage that is the problem, but the current-producing ability of the source.

Rob

12

Use a 9V one of these:

9V Adapter.jpg
9V Adapter.jpg1024×1024 174 KB

13

is there any other way of supplying power independently like battery with out using power supply ?

14

A single barebone ATmega chip can run on 3 AA batteries.
But your wifi shield needs some extra power.
You could use a 7.2V Lipo battery and power the Arduino Uno with that. And the Arduino Uno will power the Wifi shield.
For examle one of those 7.2V batteries that are used for RC cars.
Or you could use a 12V Li-ion battery with a DC-DC converter to make 7.5V for the Arduino Uno.

15

will this one be usefull

http://www.ebay.in/itm/Envie-9V-9-Volts-Battery-300-mAh-PP3-Size-Ni-Mh-Rechargeable-Battery-2-pcs-/121160307150?pt=LH_DefaultDomain_203&hash=item1c35b791ce&_uhb=1#ht_1404wt_1190

these are the batteries i used for my before use cases which i implemented using arduino UNO. please look at it and tell me your opininon...........

16

how long do you want the batteries to last
WiFi shields are power hungry,drawing around 130 ma on both receive and transmit.
Those little 9v batteries went last long,even if they work at all.
You need a bigger battery like a 7.4v lipo battery,or a 12v sealed lead act battery.

17

i want the setup of arduino uno and arduino wifi sheild to work for 1 or 2 hours.

18

Yes, that might work for about 1 to 1.5 hours if you have nothing but the Arduino and the WiFi shield..

This is cheap and 6AA alkaline batteries should go for 8 - 10 hours:

19

hi
will this adapter be usefull for supplying power to Arduino wifi sheild which is mounted on Arduino UNO ?

http://geb.ebay.in/g/ImportHubViewItem?itemid=161207736698&9V-Volts-DC-1A-Amp-AC-adapter-converter-power-supply-toys-gadgets-phone-NEW

20

Yes, that should do fine.