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Excellent video packed with tons of good information!

I got lost a bit. What is the transistor for? If I understood correctly the transistor was only used to make the light blink on its own? I understand the importance of the diode. For my project I was thinking of connecting one side of the coil to 5vGND the other side the coil to a 3.3v pin (esp8266) with the diode in between. That way when pin goes high, it would power up the coil, when pin goes low it powers off the coil. What would my way of doing it not work, or be wrong? Edit: So I did see video again, and noticed relay goes on and off because of the code you put in. I've seen a couple of short videos, like this one ruclips.net/video/19UNeUmvOW4/видео.html that connect power straight to the coil pins.

For 5:34 what does "SS" refere to?

Awesome

How much m and km range this project have and we use ardiuno nano to make

Salute for this video... I have one doubt If my transmitter is in 3rd floor and my received in ground floor in between some wall 🧱 then it will work? If not then what will be the solution for this...please tell me

This is an interesting application of electrical engineering. +1

Woow this is great

Nice and thanks for the suggestion

Thanks. Which Lib you are using for DHT11 / 22 ?

Thanks.. which lib you are using for DHT11 / 22 ?

Nice and helpful video, many thanks...keep doing for Pi Pico also.

I think the ULN is a good choice due to it being a darlington array since a darlington has a very high gain and thus requires a small amount of current to turn on. I wonder if it would work with distilled water.

Cute🎉🎉🎉🎉

Cute romcom

Both are fabulous 😍😘

wow. I'm actually more impressed with how you trimmed that rainbow ribbion cable Impressive! I digress. Back to the video! Cheers from So.Ca.USA 3rd House on the Left

i need something like this for my fuel cell in my drift car. got any ideas for gas/ethanol safe version of this type of sensor?

this guy only copy and paste from the PCF 8574 Library. nothing original. Do some thing from yourself

Yes but where is feeler/antenna (I don't know de name of this object in english) ?

Thanks bro Your works is amazing

Hello, I appreciate your video; it was very useful. I also have a question about the sensor's sensing angle. I read that this sensor doesn't have a blind spot, but I want to reduce the sensing angle. I don't need it to sense 360 degrees, just between 100 to 180 degrees. Is it possible to reduce the sensing angle of the RCWL-0516 sensor? Alternatively, can you suggest some common materials that absorb microwaves and don't affect the waves? thank you

Good baby looking

is this project can power a 12v dc motor?

Absolute genius

Excellent work

In my rcwl 0516 detect range only 3 centimeter, can you help

ULN 2000 series was standard fayre in the early '80's , driving anything from displays to servo motors. generally simple to implement and reliable 👍

hi, friend. I was experimenting with this sensor and came to the conclusion that it is not useful for alarms. It is very sensitive and is triggered by the slightest movement of a branch. Furthermore, it is impossible to direct the detection beam. Lightning cannot be channeled with either aluminum foil or 2 cm thick iron. Any comment from you would be very helpful. greetings.

Very nice explained sir keep it up 👍

Its been a while I havent used this IC. Are you going to create some projects using these ICs

Great interface devices. But beware, don't go overboard...the total emitter current for the entire package is 2.5 amps...(according to the spec sheet) or .35 A/driver; and the total package is thermal limited with a maximum Tj of 125C and 67 degC per watt Tja. So, the maximum package power dissipation is 1.5 watts, meaning each output can be loaded with a 175 ma continuous load. (Pdip in free air)

Creative video, thanks :)

The world's best teacher thanks sir

Perfect for large 7 segment displays. I used a lot of them in my projects

This chip is easily the most underrated chip around people always bang on about the 555 but it is rubbish. As engineer I never ever used 555 for anything as there are so many other ways to do what a 555 does with less parts, however the uln2003 is just excellent drive straight out from a micro no need for anything extra, drive relay coils or higher voltages ...it is just a brilliant chip.

I see this IC on computer SMPS,

These are great in my VFD tube displays. I laugh at the fact that 24 volts on the anode is considered "high voltage"! Thanks for the video.

Great mate mate

Great video information about display tm1637, with examples and Codes included. Thank you.

Very well explained! Awesome video!

This was a common stepper motor drive chip used in small school cnc lathes and milling machines in the early 90's. Stepper motor drives have come a long way since then.

correct me if I'm wrong, but in your diagrams you don't show the GROUND connection (8), or am I missing something?

The downside to darlington drivers is the voltage-drop across the device (1.3V in the datasheet) will cause extra power dissipation in the driver IC, so be sure to calculate the temperature rise from the thermal impedance info. NMOS devices with low Rds(on) are very common and inexpensive, and can drive a variety of loads, from milliamps to over 100amps with less voltage-drop/higher efficiency. The drawback to NMOS, though, is that some devices need a bit more voltage to turn them on, but that's easy enough to do with a level-shifter IC.

You used a diode's symbol instead of an LEDs By the way good video, easy enough

I wish this video had come one month earlier !!! I did not know about this IC and I rigged up this entire circuit with discrete transistors. It took me 2 weekends to get it to work. I could have saved all that effort had I seen this video before... Nevertheless, this is bookmark material, it goes straight into my saved videos list. Is there PNP version of this chip ?

This is a really great tutorial, thanks!

You can use uln2803 also, it has one transistor arrey extra

I have it hooked up like in your diagram at 11:58; the LED just blink on/off and not triggering when I wave my hand. What could be the issue?

The address can be 3-5 bytes long. Look at the chip documentation.