SayantanM4

Thanks a lot

The two lines of code above void setup is not correct. Take the IR library example codes

yes obviously ready made modules are available for cheap and with nice pcbs. but making one of own may help a DIYer to learn quite a few more stuffs...anyway, cheers

At step 4. Look on a dekstop if yur mobile nt suppoting the site properly

You need to use the enable pins of L298/L293 IC. Use analog write in Arduino code to control motor speed. There are lots of tutorials about that.

Actually..since IR is the cheapest means for remote communication, it has the disadvantage of having too much restricted angle of sight as well as low speed of communication. Your car needs to move slow, not too fast, otherwise you'll lose control very easily. Your car needs to move slow so that you can point your IR directly to the receiver. Otherwise for a fast car,you need to use Bluetooth like hc05 or a 433mhz transmitter receiver module.

Sorry for the late reply..lets take the first hex code from the code: 0x80BF53AC ( in the joystick ir tx .ino file)You use this link to convert hex to decimal: https://www.binaryhexconverter.com/hex-to-decimal-...You will see the decimal equivalent is 2160022444 ( in receiver.ino file) now it is a standard to use 4 byte hex values, as you can see in tv remotes. that's why i've used it. you may try to use your own values by trial and errors.good luck

That's not photodiode, that's IR LED. IR LED may come in a transparent package or may be in a deep bluish window. It is actually not that deep black (photodiode). It's deep blue. Search online for an IR LED and you'll get it. And you may safely use a resistor between 100-330 ohms.

At step 4, plz look on a pc, or desktop view on your smartphone

Attach it directly to the system. One leg at common ground and other to the audio output pin of Arduino as in the fritzing diagram

Use your smartphone camera to see whether the IR led is ok or not. It's forward voltage is about 1.5v and it will burn out easily if suitable resistor is not used. Also see whether your TSOP is ok or not by running some debug codes beforehand. Also check whether your TSOP version is 1738 or not. Also check your motor driver, see if enable shorter caps are in place . And last but not the least, those jumper wires tend to become damaged in no time ( the wire dries up in course of time), so check it's continuity.

If you connect everything as per the ckt given then it will work just fine. Buzzer will not work. Buzzer is not a speaker. It can just generate beeps. This application uses a speaker

https://howtomechatronics.com/tutorials/arduino/ultrasonic-sensor-hc-sr04/ i think this might be useful

If you connect everything as per the ckt given then it will work just fine. Buzzer will not work. Buzzer is not a speaker. It can just generate beeps. This application uses a speaker

You may use a SD card module to note down distances and you may generate a vector space of the room using some advanced direction measurements along with a acclerometer like MPU6050 or an ADXL345

yes, you may need to change that. this will also depend on the current rating of the coil.

you solder it on a board. you'll need this ckt to drive clocks for sequential logics

That's just fine. THis simple ckt will be very much useful for driving clocks of sequential logics

evreything given in the post

You may add an SD card module for example to keep track of every obstacle it faces. And if you get more money you can attach a small camera with it. Then you might run any AI algorithm to analyse them.

No this is a square wave generator and this will not generate white noise

You may read this https://circuitdigest.com/electronic-circuits/simple-white-noise-generator-circuit-diagram

Yes,you may, but in that case output frequency range will change. Since as I wrote before the frequency is dependent on resistor and capacitor value

You may read this link .this link covers the basics of ultrasonic distance measurementhttps://howtomechatronics.com/tutorials/arduino/ultrasonic-sensor-hc-sr04/

Sir/Madam English plz

study the code attached here for understanding..you can also refer to this..https://howtomechatronics.com/tutorials/arduino/dht11-dht22-sensors-temperature-and-humidity-tutorial-using-arduino/

That's in step 2..please scroll all the pics..

Actually I didn't use this display for touch purposes.actually I found this touchscreen very troublesome and problematic.so I decided to buy a nextion display which are pretty decent.you can watch them on YouTube

The capacitance of the variable capacitor will determine the frequency value of transmitted fm signal. Actually this requires some trial and error methods. You have to take a radio and set to a particular frequency such that it is being used by no other channel. Now slowly rotate the variable cap and you'll find a point where the radio sound becomes dead silent or it can make a very high pitched sound nearby the frequency. That point will be that operating frequency. The cap value has a highest value of 40pF.The formula for unmodulated carrier is 1/(2*pi*sqrt(0.15uH * C))... Where C can vary from 20 to 40pf.

Thanks

Download the MCU friend kvb libraryhttps://youtu.be/Js4wykWY6zg

Actually I've lost that library which I use. You download a different library and then write the DHT code for that

You can use any DHT library you may like. You can change the DHT code to make that work

The capacitance of the variable capacitor will determine the frequency value of transmitted fm signal. Actually this requires some trial and error methods. You have to take a radio and set to a particular frequency such that it is being used by no other channel. Now slowly rotate the variable cap and you'll find a point where the radio sound becomes dead silent or it can make a very high pitched sound nearby the frequency. That point will be that operating frequency. The cap value has a highest value of 40pF

Yes the AT commands take care of all of them . there is a complete list of AT commands available on the google. Actually the entire thing happening in this AT commands are quite complex. We just use them to finish our task. Actually a complex process happens in the hardware. The SIM used here is a normal 2G/3G SIM, nothing special. I have not tried 4G SIMS yet. Thanks Sir!

bro..enter your ssid and pass of your router here...in the starred areas, at the beginning of the code

hey man you had set baudrate in the serial monitor at 9600...set it to 115200 then press rst on nodemcu and then see

please download the fzz file attached there and open up code tab

Thanks Sir

Thanks for the information Sir!! I'll keep that in mind always, and by the way, you can use either 817 or 4N35 or MCT2E, just reading about the inside BJT characteristics from the datasheet is necessary...

The IR Led receives about 4mA of Current and that is sufficient for its glow...the BJT part is fully seperate...it has no dependance on that 4mA...it is a fully seperate circuit and that bjt is controlled by the IR light falling onto it's base, we apply seperate KVL equation for that BJT part, .....yes that BJT is actually saturating and 1K is good for that

Yes.. Good job.. actually I used a different library... You can use your version too... Just modify the temperature finding part and you are all set... Cheers

No....line voltage is not used to energise the relay...5-6V DC signal is used to energise the relay coil..look at the circuit carefully...it is a normal 5V relay

I'm planning to use it in my Ac loads and I've tested it with high voltage dc load, it works fine.. and now I'll move on to test with small ac loads like small lights or indicators.. If everything is all right I'll also move on to controlling my fans.... The opto is a vital component... The input and the output side are now fully isolated

https://www.instructables.com/Controlling-Appliances-From-Smartphone/I've also done a similar project... Cheers..

The above relay coil is energised by DC current of 5-6V...and you can attach any DC or AC load at the output

where the other end of the 10K resisitor ar gpio 15 would go???

where the other end of the 10K resistor at gpio 15 would go???

Thanks bro..I'll check your instructable

Yes it works just fine..there are two videos describing it at the last step..Absolutely it would be best with wood with air tight gaps..but I did not have the required tools right now with me so I managed with cardboard..

You can also use the proposed structure..add some motors too. so that it can be called to your side

LOL..Yes it is a bit awkward looking due to lack of proper parts..anyway it's just a sort of tutorial..you can make it even better by attaching display wheels,etc..

I would like to power the nodemcu with a good 9V battery (eg Duracell or any good company.. Not the Chinese cheap ones) or with a Li battery( with voltage rating greater than 5V but less than 12V) along with protection circuit( protection circuit is mandatory for Li batteries).