A better example would be if you used a zener to establish Vref - because your comparator desdign relies on a completely stable Vcc. If you are (for instance) monitoring a battery output voltage and using the battery for Vcc you need a zener to produce a reference below the minimum battery voltage and a potential divider for the Vcc to Gnd - giving an absolute general purpose comparator design that works over a range of source and target voltages (especially if you put a variable resistor into the potential divider).

I know it has been 2 years since this has been uploaded but I wanted to know if there was a way to be able to reset it back to normal once the correct code is entered, I wasn't able to figure it out myself.

Hello, how are you?! Could you please help me assemble these items with a smoke sensor and a flame sensor? So when he detects smoke or flame, he calls the firefighters and the person’s personal cell phone.

With out serial monitor this project is not worked. When I send 's' from mobile to 800l then 800l send sms to my mobile as reply. With out serial monitor connected.

why is the fan keeps spinning after the fire is removed?

Can we send SMS to multiple number? Thank you

Hola muy buen video, tengo una consulta, por lo que vi en varios videos, en el codigo tenemos que poner el numero de telefono al que queremos recibir el SMS. Pero por ejemplo yo necesito mandarle un mensaje al SIM800L preguntandole si esta la luz prendida y que me responda SI/NO, pero yo quiero que lo puedan usar todos los integrantes o cualquier invitado, (no se si me explico) ¿no hay forma, por ejemplo de mandarle un mensaje al SIM800L, que guarde el numero de telefono desde el que recibio la pregunta y responda a ese numero ? luego si viene otra persona con otro numero de telefono distinto, manda un mensaje al SIM800L que guarde el numero y le responda a ese mismo y asi?? (no se si logre explicarme) Saludos!

how to write or read individual ports or pins of 8574 module using wire library only? do not use pcf8574 library.

Question : when making a call we should receive "ringing ringing" on serial monitor as a result?

danke danke danke...

What model of arduino you use?

Do this code work's in esp bords?

Accuracy will change with pressure. When water is flowing with low pressure the pulses will be different than when with higher pressure.

thank you Borat

Kawatnya berapa diameternya bang yang dipake? Takut salah beli

Very well expleined thank you from Morocco

It was a great videos. I want to measure current in microamps, what kind of circuit can i use.

Thank you for this

Is the value measured in Pzem004t in seconds or minutes? Because I have 209 volts, 0.032 amps. And if that's hourly, it's almost hourly Doing 500 watts

Thank you for this video Can you please tell me what I should type after s

Please can 4g sim work with it

hello, please help, my motor is just vibrating. Also im usin 24v, is that the issue?

Nice simple setup. Excellent circuit. Gives me joy when something works, first time !!

I dint see where yoi connect microphone and speaker

Hi, you wiring is wrong, SDA and SCL are shared for both INA219 and the display, however, you have them mixed, Pin 5 from Arduino goes to SDA of the INA 219 and then to SCL to the display.

Thanks for the video. Could the sensor be used to test Ohm's laws?

Can i use this sensor for dc?

I'm going to use this with ESP8266 so I can show RPM value in webpage. Can I use 3.3v to supply power to this module? what output voltage from this module?

Sir, I want control the voltage using a 10K potentiometer, Vin=12V DC, and Vout= (between 0v-5v) from the potentiometer. So, I need a resistance R1, that will drop the voltage from 12v to 5v, in order to produce Vout = 0v to 5v from the potentiometer. But I am unable to calculate the R1 resistance value. Please help me in this.

can this Water Flow Sensor be installed directly in the pipe where tap water passes?

Complation error: 'ACS712_30A' was not declared in this scope (What should I do?)

Pak, ini kartunya pake kartu sim card biasa spt telkom apakah bisa?

1:17 dato clave sobre qué sensor usar para medir corrientes menores a 0.4 A

Any way to read 1mA resolution ?

Very good work, sir ! Is it possible to change the lux value of BH1750 sensor in W/m2 ? Thank you

I want to use 4 pzem004t sensors plz help sir in knowing the pins of arduino on which it is to be connected

Please someone list the components used in this circuit

This video really helped me a lot.....my sensor wasn't showing any readings then I realized the problem was with the source and ground connections. Thankyou❣

Boss how to write the rain sensor for uno using computer. Tq

just what I was looking for

i need your help how to contact you sir

I'll try using your video, as I have an ESP32 S3 board and an INA219 current sensor and using PlatformIO in VSCode and I can't see the current values. It only says `Talk is running`, which means it is reading, executing but the current values do not appear on the terminal. If you can give me a tip I would appreciate it! Or if I had a video from someone even better?

Hi, is it must to add an voltage divider in between the Rx of module and Tx of Arduino Uno?

Please my current sensor is 30A and after doing everything, my sensor is reading zero current when no load is present but it’s reading 2.5 voltage when no load is present as well

I tried same but with esp32 board and the heading is being displayed very wrong. It is stuck at 237.61. no matter how much I rotate the magnetometer horizontally, it remains the same.. I tried removing power of magnetometer. Amazingly, the reading was being updated the same even when the magnetometer was removed. I am stuck here and it doesn't seem to work. What do I do?

Gracias.. Can You tell me where can I Buy the SENSOR ...? Gracias

😅 gracias

hi bro, how to this with 2 wires ptd100?

AT+CCID ERROR The led is blinking once every second . what may be the issue??