AC Current Detection Interface

This video will describe how to build an interface circuit to detect AC current in 120VAC and 240VAC loads. The interface will output a digital signal for feedback purposes to a microcontroller so load activation can be verified.
Sensor interface video:
• Sensor Interface Circu...
Mosfet part number should be:
2N7000
www.banggood.c...

[@bgable7707]

Once again "just" another EXCELLENT video. Heading over to your Sensor Interface one now !!! Thanks

[@francoisdastardly4405]

Perfect to make a soft start ac motor ❤❤

[@VasilisKarastergios]

Useful circuit thanks for sharing it!

[@F4C31355]

Thanks! I was searching for circuit like that!

[@0033mer]

You're welcome.

[@ayookunlola1537]

Nice job!!!! You are wonderful

[@ayookunlola1537]

How can we measure the current value.is the variable tune to 5v or less than 5v

[@Banzay20]

Earlier question erased... just realised the op amp did not send any current... okey I have to find a mosfet then... thanks for the video

[@0033mer]

The correct Mosfet part number is 2N7000. They are available online: www.banggood.com/10pcs-2N7000-NChannel-Transistor-Fast-Switch-MOSFET-TO92-p-924050.html?rmmds=search&cur_warehouse=CN

[@Banzay20]

Thanks. so whats the features you are looking for in this mosfet?

[@0033mer]

The gate to source input of the mosfet is high impedance so it will not load down the output voltage of the charge pump circuit. You can also vary the value of the 220k bleeder resistor to adjust how long the LED stays on after the AC current drops to zero. Another variation is to use an opamp as a voltage comparator to trigger the LED.

[@Banzay20]

Wow I got it to work with an Arduino and a relay, such a good feeling! Can´t wait to share...

[@Banzay20]

So I have an LED on the active LOW output, but it never really shuts off. So I was thinking maybe the op-amp output noise never puts the gate LOW. Would a split power supply to the op amp with a negative voltage be better to pull the gate LOW? I have noticed that red LED is easier to shut of while blue, white and green (if I remember it right) are not as easy to shut off, Im guessing it has something to do with the voltage drop difference. Im switching a fan on and off sensing a 230Volt heatgun and it works pretty good for being my first build, and Im actually sensing directly on the op-amp output and its a bit sensitive but it works not perfect but okey. I could not get the intended output to switch off so I took this path instead. thanks for a great video

[@Brainstorm4300]

Hey man cool video. I need a help. My friend keeps frying his phone chargers, router power adapters etc. I took them apart and all of them look really charred. He asked me to build him a good charger but I'm worried that the power quality in his house might be dodgy but I'm not sure. What kind of protection should I put in the charger input to ensure it doesn't blow up like the other ones?

[@0033mer]

Try to find out the source of the poor power quality and get it restored. If no luck there install a Sola CVS transformer (constant voltage transformer) Check on ebay.

[@AsIsStuff]

Well, I'm pretty new to electronics, so pardon me my question, if it is stupid. But why not just use the hall sensor module?

[@magicianofelectronics951]

exactly the same way I want to detect a fault in my handsfree broken wire, but low power is a problem may be, may you help me? thank you

[@tracysmith7318]

Hi. Great videos. I need to pick your brain. . . I run a full solar system in my 9 ton truck and caravan. (Australia ) I am retired and travel Oz. I run an 8kw inverter for my heavy loads. Hot water system, bread machine, coffee machine etc. Rest of the time, I switch over to my small 1kw inverter. The internal 1kw inverter fan, switches on above 45 deg C. For me, I prefer to run the inverter cooler so I have an additional cooling fan running all the time. I'd like to control when the fan runs. Say 0.5 amps (240v in Oz) 120 to 150 watts. It's so annoying at night when there's almost Zero load and the fans running. Noise. . . Do you have anything that can operate a relay to switch the fan on and off thats controlled by the load amps ?

[@0033mer]

You need an AC current sensing switch. Here is an example. The current trigger value is adjustable. Get the model that meets your current/voltage needs www.amazon.ca/NK-Technologies-AS3-NOAC-FT-Normally-Solid-core/dp/B005S71MAC

[@eaf2k]

Out of curiosity, if the swing on the coil is 600mV, would a single germanium NPN not be an adequate alternative to the whole op amp front end?

[@0033mer]

Yes, with a large enough output you could feed that directly into an indicator circuit or even an ADC of a microcontroller. By adjusting the burden resistor, this circuit was designed to detect large currents to very small AC currents. I use the op-amp circuit to build many types of custom sensors. kzbin.info/www/bejne/rXbUl3ullMyofZo kzbin.info/www/bejne/aJDEeISghd-sidU

[@DavidLeeMenefee]

Good job. Thumbs up...PEACE

[@alibehrouz9833]

thanks

[@shaikhsaffan]

How to iam make TA12-100 CT module using simple CT please tell me I really need it.

[@0033mer]

Check out this link: henrysbench.capnfatz.com/henrys-bench/arduino-current-measurements/ta12-100-arduino-ac-current-sensor-tutorial/

[@shaikhsaffan]

Nice video. I need your help my project name is overloading detection and automatically shunt down using arduino, display 16*2,CT, and relay then bulb as a load. Then one bulb holder add a bulb then display indicate like 40watt of bulb now iam add second bulb then display indicate 40w+40w=80watt. And one set value like 300Watt then iam add bulb more then 300Watt then my relay trip and display indicate overloading. So how iam make this project please help for circuit diagram and arduino code only please help me. Relay my comment.

[@0033mer]

henrysbench.capnfatz.com/henrys-bench/arduino-current-measurements/ta12-100-arduino-ac-current-sensor-tutorial/

[@shaikhsaffan]

@@0033mer thanks for replying my question. in this link not given display connection 16*2 circuit and one question this for AC. Watt measurements?

[@shaikhsaffan]

In this link available connection and code of only CT. Not available circuit and code of arduino to display and - this for code for - watt measurement -? I have link you just checke arduino code is right for CT or not. www.engineersgarage.com/contribution/electricity-anti-theft-system-over-loading-detection-and-automatic-shut-down In this link transformer use as a CT. Check code

[@adriel2625]

can i use this sensor to measure dc current? for example a current of a 190 v dc motor

[@0033mer]

No ... the sensor uses a transformer which needs a moving magnetic field (AC) for proper operation. For DC detection you need a linear Hall effect sensor. www.elecrow.com/acs712-current-sensor-30a-p-710.html

[@jringenieriaelectronica352]

I don´t understand why you connect your GND line in the protoboard (0.29s) .... It´s already connected from the factory... Arduino Boys :(

[@0033mer]

The power and ground rails on my solderless breadboard are split at the center and are not connected from the factory. When Continental Specialties introduced the solderless breadboard in the early 70's the power and ground rails were split and were for many years with many vendors until knock-offs from China came on the scene. As a teacher I see students forgetting to apply the jumpers and wonder why their circuit is not working. I can see you are a beginner to prototyping with solderless breadboards. The Arduino bootloader on the ATmega328p has been erased ad reflashed with a FORTH operating system and programmed in FORTH so no "Arduino" code is running. www.forth.com/resources/space-applications/

[@jringenieriaelectronica352]

@@0033mer If the blue/red line is continuous, so the breadboard is connected internally. Try It...

[@0033mer]

Yes .. If the lines are continuous they are connected internally. Some boards the lines are broken indicating they are not connected internally. When a student carries around these boards in their backpack the blue/red lines eventually rub off which causes problems. I instruct all students to apply jumpers and leave them there no matter what the markings are. This resolves many problems for the students.

[@wilmersoemo]

Hi, is it possible to incooperate a counter within the code to detect the "downtime"?

[@0033mer]

Yes .. or even a Real Time Clock (RTC) IC to measure a time interval.

[@wilmersoemo]

​@@0033mer thank you for your reply, but may i know what would be a better way?, i have tried using the code below but seem to have an whenever, i place a wire into the arduino Analog in A0

[@hyedenny]

No such thing as a 2N2700 MOSFET. Maybe you meant 2N7002?

[@0033mer]

Yes .. there is a correction in the description box.

[@devilvortex1]

How I can setting current limit 27A and the led turn on?

[@akankshsukumara]

ADC using any microcontroller would do the job. But this current transformer supports only 5A measurement of current

[@kendouciabdelaliilyas]

@@akankshsukumara What will happen to this current transformer if current was large then 5A ?

[@TheUnofficialMaker]

Will this work at 100ma load? Just ordered some of those CT's and parts.

[@0033mer]

The circuit is pretty sensitive so by using the sensitivity pot and adjusting the value of the burden resistor you should get it to trigger with 100 mA.

[@TheUnofficialMaker]

@@0033mer I can always run a few more loops around the CT, I will give it a shot.

[@0033mer]

Yes, that will also help.

[@katalina1953]

No real life applications - just theories

[@0033mer]

The circuit is a "universal" type and can be used in many real life applications. kzbin.info/www/bejne/aJDEeISghd-sidU

[@deweywsu]

Are you kidding? The whole video outlines a real life application - he demonstrates a 120V analog sensor circuit that can interface to computer level logic, providing inputs as to the circuits state.

[@muhammadfaizannisar955]

i need to measure the micros and milli amp current is it possible by your crkt ????????????

[@charmalonso]

any new about?