arduino 9v battery charger
I powered all my Arduino experiments and projects either with the USB cable connected to my laptop or I have this 9 volt battery holder with this I think it’s. 5.5, 2.1 millimeter connector just plugs into this jack right here and i have a rechargeable 9 volt battery and this holder was the vet battery. I have up two of these. I charged up as an onoff switch, so that’s pretty convenient. So if you want this to be, you know autonomous separated from your laptop, not connected through this umbilical cord. You have this, but it’s still kind of kind of awkward there’s another option, and that is the Adafruit power boost 500 shield and again this is a shield. So it plugs right into your Arduino and it holds a lithium ion polymer battery, so it recharges a battery plugged into it and it has the same profile as your Arduino, and this is what it looks like and it just plugs right on top of your Arduino And you could plug other shields on top of it. So let me get this out of the way here, and this is what the shield looks like all. You have to do with solder on the header pins and it does not charge up through the Arduino. It has a separate mini USB cable that you attach to charge up the lithium polymer lithium ion polymer battery. It has a low voltage LED indication when it gets down to three point: two volts.
I think the batteries are around three point: seven volt batteries and lithium ion batteries have special charging requirements, so they’re a little bit fussy when charging. So you don’t want to use just a regular charger to try to charge one of those there’s an optional onoff switch that you can attach. I guess by default, it’s normally on. There is some type of electronic fuse. I think when you draw too much current, the fuse opens up, but it’s not permanent, and once you stop drawing the current that’s over the limit, I guess it corrects itself and goes back to closed, not certain. What part on on this does that I don’t know. If there’s a schematic for this or not, maybe I can read some of these part numbers and figure out what’s going on here. But let me show you the battery that you can plug into this so here’s an example of the lithium ion polymer battery this one. Here is 2500 milliamp hours and unfortunately, in my quest for more power, I overlooked the fact that once you step up to this size is not the recommended size, it does not fit the shield here, there’s a two thousand milliamp hour battery that is it’s thinner, are Not thinner it’s it’s not as wide as this one, so it fits neatly between the header pins. So then you can stack other shields on top of it and that’s. Probably why they’re out of stock on that one, because it’s the highest rated battery for this shield? I guess it’s too bad that I guess it would have to be longer or thicker in order to get over the two thousand milliamp hour rating, but yeah all you deal with solder on the header, pins and you’re good to go.
So let me do that here. Are the header pins right here? You use the Arduino to line up all the pins to help you solder them keep them in place while you’re soldering them. So these are the header pins you get and the onoff switch I’ll just place that still in the bag. Here’S the onoff switch, so what I need to do is line this up, put these header connectors in here through the board and into the Arduino, and then have this upside down and just tack a couple of these pins on each of these connectors to hold it. In place, and then I can finish the soldering – this goes on there now on, so you want these flush that’s. Why I’m going to have this upside down, and just the weight of the board should keep that flush in ye space between the board and the connector, and you want these lined up nice and perpendicular to the board so making sure there’s no space. You know what the board lifts it up like that. You want that flat, just tack a couple of the pins on each other connectors. So then you can remove the Arduino and finish soldering. The pins let’s see if I can get that in there might be too close. I don’t want to melt any of these connectors, so I don’t want that gap there, so it’s going to be a little awkward. I have to keep pressure on this and still hold the solder and the iron, on the other hand, let’s see if I can do that and just tack this corner, one okay that should hold that down.
It looks good okay, so let’s do this corner here and this one now I can remove the Arduino and finish up with the rest of the pins. So now we can solder the remaining pins. So let’s finish up the pins on this last connector. I apply the soldering art into one side and the solder on the other side try to get the solder to flow toward the soldering iron and I’m just going to reheat. These outer pins that I just tacked. Initially get some better solder joints on there that’s it, you need to put the onoff switch. I want to on off switch connected. It also has these pads that you can connect wires to if you want to monitor the voltage separately and read it from the Arduino. I want to put this on off switch on. You need to tape that down so this. If it’s, not stained, you can go ahead, put some solder on and then then you can apply pressure and push the tabs through. So the switch is flush, just reheat that – and now I can finish the rest of the pins okay. So all the head of connectors are soldered on. I don’t think I missed any pins. Get the onoff switch here. Let’S go ahead and hook it up to the Arduino just make sure all the pins are lined up and just press it on go ahead and hook up the battery just connects right here and if this was the right size that would just fit in between these Stacking headers in between, like so another nice little profile and I’ve, got the onoff switch here.
So let’s turn this on there’s a blue light indicating five volts, and if we can look underneath here, you can see the LEDs on the Arduino a lit up indicating it’s powered up. So this is another option for powering up your Arduino projects. This does not again. This does not get its power from the Arduino board. There’S a separate mini USB jack right here and you connect to that in order to charge up your battery and once it’s charged up, you can disconnect this and then turn it on and power up your Arduino. So that’s a nice option, the yellow LED indicates that the battery is charging and once the battery is charged, the yellow LED turns off and the green LED turns on. So you can see. The green light is on now indicating that the battery is charged and the charging LED is off so that’s. The Adafruit power boost 500 shield for the Arduino lets. You connect a lithium ion polymer battery to your Arduino projects and again it’s also a charger it charges up the battery.
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