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Good morning all today I'm going to play with the NAT 1/9 current sensor well it's a voltage and current sensor, and it can even report power I believe, so I've got two NAT one nine boards here this one's kind of modeled on the original Ada fruit board this one's been slightly altered it's a bit smaller, but it uses a larger terminal block and the interface is I squared C so VCC ground SCL and SDA and all I'm going to do today is get one of these or perhaps both of them hooked up to an Arduino I'm going to use this UNO NATO it's a NATO with, and you know bootloader, so it behaves as, and you know I've got a piece of wire here with a battery connector and a little bulb in one of these connector blocks, so I'm going to use that just to put a small current through the sensor and see if we can get some readings coming out on Arduino x' serial monitor so the first thing I need to do is solder the six pin header on here that's four pins for I squared C and 2 which are duplicates of V in minus and V in Plus which are the large connectors for the current to flow through so while the soldering iron is warming up let's take a quick look at this data sheet this one is Texas Instruments I'm not sure whether there are other manufacturers making this chip it's but it's the NAT one nine zero drift bi-directional current power monitor with I squared C interface it can also sense bus voltages from zero to twenty-six volts now I don't know whether you have to link ground on the current sense part of the chip to ground on the digital side not sure if we can check that out so it also reports current voltage and power I think there's an on-chip multiplier to calculate power or you've got different I squared C addresses high-accuracy filtering options and so on now I've also found this Ada fruit I Na to 1/9 current sensor breakout instruction booklet I suppose which is this ball very similar to one of the ones I've gotten in here there's just lots of useful information to guide us through this process so just so during the six pin header to the blue board, and then I'll put the terminal blocks in and then do the same again with that purple board might as well check that they're both working right now I need to connect this board to the UNO I need VCC ground SCL and SDA now they don't quite line up in the same sequence, so I have to swap a few of these wires around on this four pin DuPont cable yes this one goes ground VCC SDA SEL this one goes VCC ground SEL SDA, so that's two swaps I think, so now I've cut a break in the positive side of my power supply and load which is that bulb, and I'm going to put both those positive leads through the sense resistor I'm going to put the power supply the battery on the plus and the load on V minus, and then we should get positive current numbers coming out of the Arduino but for the moment I'm not going to reference the negative side of my well high current you could call it circuit to ground on the Arduino because I'm just...
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