WEBVTT Kind: captions Language: en 00:00:00.446 --> 00:00:05.956 ♪ Circuits, energy, power. ♪   00:00:05.956 --> 00:00:10.000 We’re introducing three new xMR current sensor breakout boards. 00:00:11.861 --> 00:00:14.346 The first sensor is the ACT001,  00:00:14.346 --> 00:00:18.084 a TMR analog bridge sensor with an on-board current strap. 00:00:18.764 --> 00:00:20.084 Just six pins:  00:00:20.084 --> 00:00:23.506 input current, output voltage, and power. 00:00:24.298 --> 00:00:27.521 Each of the breakout boards has a business-card sized manual 00:00:27.521 --> 00:00:30.024 with key sensor specifications on one side…  00:00:30.290 --> 00:00:31.797 …and pinouts on the other. 00:00:32.524 --> 00:00:36.157 This sensor runs on any supply from zero to 14 volts.   00:00:36.614 --> 00:00:38.472 We’re running it on five volts.   00:00:39.169 --> 00:00:40.244 The output is connected to 00:00:40.244 --> 00:00:43.023 an inexpensive two-volt panel meter, 00:00:46.498 --> 00:00:49.558 There’s plenty of output without amplification, 00:00:51.457 --> 00:00:55.982 and it measures up to 500 milliamps.   00:00:57.085 --> 00:01:00.669 Let’s "shed some light" on how it works on AC.   00:01:01.005 --> 00:01:04.525 A 40-watt bulb draws about a third of an amp RMS.   00:01:05.361 --> 00:01:10.333 The meter shows a large sensor output-- 115 millivolts RMS.   00:01:10.333 --> 00:01:11.980 The ’scope shows the sensor’s AC output, 00:01:11.980 --> 00:01:15.821 since it senses polarity as well as magnitude. 00:01:15.821 --> 00:01:18.628 Unlike a shunt, the sensor is isolated. 00:01:18.628 --> 00:01:20.316 Dangerous line voltage here...  00:01:20.709 --> 00:01:22.708 ... but the sensor output is safe. 00:01:23.725 --> 00:01:25.159 The breakout board edge connector 00:01:25.215 --> 00:01:27.322 doesn’t have enough creepage for line voltage, 00:01:27.322 --> 00:01:29.092 so we snipped it off. 00:01:32.200 --> 00:01:36.340 The second sensor is the AAL024, which is a GMR sensor 00:01:36.340 --> 00:01:38.803 ideal for over-the-trace current sensing.  00:01:39.531 --> 00:01:41.682 It needs just four pins: 00:01:42.000 --> 00:01:44.368 two for the output and two for power. 00:01:45.256 --> 00:01:47.256 The output is linear with current, 00:01:47.369 --> 00:01:49.766 and it has a large signal compared to a shunt-- 00:01:49.766 --> 00:01:53.010 43 millivolts per amp with a five-volt supply-- 00:01:53.010 --> 00:01:55.484 the equivalent of a 43 milliohm shunt. 00:01:57.034 --> 00:01:59.376 This board handles up to seven amps. 00:01:59.472 --> 00:02:02.125 There are also one-amp and 50-amp versions. 00:02:04.675 --> 00:02:08.113 The drop through the shunt is about 0.08 volts at five amps, 00:02:08.377 --> 00:02:11.314 so the shunt resistance is just 16 milliohms. 00:02:11.909 --> 00:02:13.497 Some of that's connectors and wires 00:02:13.497 --> 00:02:15.074 and it's with one-ounce copper. 00:02:15.864 --> 00:02:18.951 And unlike a shunt, it's isolated. 00:02:19.674 --> 00:02:21.927 The AAL024 is GMR 00:02:21.927 --> 00:02:25.831 rather than TMR like the other two sensors we’re demonstrating today. 00:02:26.451 --> 00:02:28.022 GMR is omnipolar, 00:02:28.022 --> 00:02:31.327 which is why we used the same color wires for both sides. 00:02:31.797 --> 00:02:34.862 We can switch the polarity and the output is still positive. 00:02:35.645 --> 00:02:38.983 So it will full-wave rectify an AC current. 00:02:41.269 --> 00:02:42.054 Our last sensor 00:02:42.054 --> 00:02:45.292 is an I²C smart magnetometer over a trace. 00:02:46.459 --> 00:02:50.299 It only needs four pins, and two lines of code. 00:02:50.302 --> 00:02:51.095 The sensor output 00:02:51.095 --> 00:02:54.296 tracks the current very closely over a wide range. 00:02:55.972 --> 00:02:57.497 The Trinket microprocessor 00:02:57.497 --> 00:02:59.399 reads the I²C sensor, 00:03:00.000 --> 00:03:01.953 scales the output for current, 00:03:02.081 --> 00:03:04.977 and drives the I²C display. 00:03:06.059 --> 00:03:09.227 Our smart sensors have ridiculously simple software. 00:03:10.000 --> 00:03:13.015 It takes just two simple lines of code to read them: 00:03:15.019 --> 00:03:17.883 Most current sensors are much more complicated. 00:03:17.883 --> 00:03:20.420 This competitive sensor has a messy pinout… 00:03:21.179 --> 00:03:23.082 …and complex software. 00:03:23.527 --> 00:03:24.577 Yikes! 00:03:26.819 --> 00:03:30.416 These are the three simple current sensing solutions we demonstrated: 00:03:30.661 --> 00:03:34.874 The ACT001 is sensitive, high temperature, and low power. 00:03:36.258 --> 00:03:38.386 The AAL024 is sensitive 00:03:38.386 --> 00:03:40.358 and has a wide linear range. 00:03:42.144 --> 00:03:44.782 The SM223 is factory calibrated, 00:03:44.823 --> 00:03:48.662 has a bipolar response, and an I²C interface. 00:03:50.918 --> 00:03:54.212 These are the ancillary components we used for these demos: 00:03:56.570 --> 00:03:58.863 Click, email or call for more information, 00:03:58.863 --> 00:04:01.564 or to order current sensors or breakout boards. 00:04:02.549 --> 00:04:06.462 Please "like" this video and subscribe to our YouTube channel for updates.