Why you Really need to learn ESPNOW JSON Communication. Watch to know more
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- Опубликовано: 22 мар 2022
- This video will guide you with how to transfer data between ESP32 boards via ESPNOW Communication using JSON Format. This thing is really very important you want to make the next big project.
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How badly you are waiting for the ESPNOW to Blynk Cloud gateway project ? Rate from 1 - 10
10
10
10
Waiting sir 😁
10
Great video showing how easy it is to send data in JSON format, which is good when we might be returning different data at varying times, but that 250 byte limit makes JSON largely unsuitable for anything more than a few sensors at a time. For the particular use case you have demonstrated (sending 2 floats), since the size / format of your data is known at build time, you would be better sending that data as a C Struct. A struct of 2 floats would consume only 8 out of your 250 bytes. In JSON format you are using more than this just on key names, brackets and whitespace alone and your two floats are being sent as strings using significantly more space than they would need to be sent in binary format.
Great video .. I have doubt, that I am working on something with esp8266 board to send real time data to blynk. But for that controller I need a standalone power supply which I expect to run for months ( like batteries / mini solar panel ) .. but I can't find any useful resources for that in internet .. can you suggest your thoughts on that
Great project! 😊
Parabéns, muito obrigado! Mesmo! I am from Brazil!
Just because you can, doesn't mean you should. It is good for learning but we should know the real life application / use case of such projects.
oh please: I have reprogrammed all my environmental sensors that were working on WiFi (talking to my router) into ESPnow devices. I added 2 ESPNow2MQTT gateways and I have totally different (better) project now at home. Why?
1- WiFi sensor before it gets connected to router takes at least 600ms, usually around 1s (fixed IP, fixed channel). Add to that time to gather the data from sensors and you are at 1.5s at least
2- the same sensor on ESPNow takes around 20ms to get connected and to send data over ESPnow. So my sensors now are ready to go to sleep after around 200ms.
3- Having 2 ESPNow2MQTT gateways at home I am less dependent on where the router is and where the sensors are.
Conclusion: battery life and coverage. Now my sensors are ready to stay on battery for around 1 year (still testing it but let it be even 8 months - it would be around 8 times longer than when they were on WiFi).
But again: DON'T USE JSON over ESPnow - you are wasting your bytes and you have only 250 of them in ESPnow.
Wow, cool project. Thanks.
Thanks a lot sir 😊
Great video broo... Good Luck and thanks
Can this be used to send a base64 image through json?
Yet another cool video 💯🔥
Waiting for the next project bro......
What is the added value of using JSON? Using esp-now with the standard way gets the same thing with much less effort. Also: I think STRING is a bad method to use.
Great 👍
Dear when I am compiling for receiver, I am getting this error "Compilation error: invalid conversion from 'void (*)(const uint8_t*, const uint8_t*, int)' {aka 'void (*)(const unsigned char*, const unsigned char*, int)'} to 'esp_now_recv_cb_t' {aka 'void (*)(const esp_now_recv_info*, const unsigned char*, int)'} [-fpermissive]"
Is this equal to mesh network?.
Great learning
Thank you
What’s the benefit of this over using a structure?
Have you made any project where one esp will be connected to internet and other communicating without internet like their own hotspot or esp now. So that if I go the browser and ask ESP1 to turn on the light of ESP3 it can do that ?
Yes
The next project is exactly the same
Excitement level : 100/10 🙌🏻
Can you tell me why JSON communication is better than normal?
is the transfer speed more? is the dataload less? requires less power? why?
Bcz without json ull be messed up wike without css
Aggressive teaching thanks
😇
🔥🔥🔥🔥
How fast is the communication speed? Is it fast enough to use it as a transmitter and receiver for a quadcopter?
for the always on device sending full 250 bytes takes less than 2ms
Hi sir
Can we transfer audio and video from one esp32 to another esp 32 through esp now protocol
Yes you can. ThatProject channel and atomic14 channel made so many videos
Make video on Communicattion between Nodemcu to arduino uno
Cooool
♥
I am using Arduino IDE version 2.2.1 .... Thanks
Sizeof() is an incorrect way to calculate the size of a pointer, this can lead to incomplete data therefore an error. Use: measureJson(doc)
5 th view from India
considering you have only 250 bytes, using JSON in ESPNow is VERY inefficient as you are sending not only values but also the keys and very often key length is longer than value (plus colon, quotation marks etc.)
Excitement lvl 8
He brought it down actually, until a year ago he was at lvl 69 🤪
Why don't we see the MAC address in the code?
Okay
Data for espnow < 250 bytes
Json doc = 1k
This is correct ?
Ok
10
Why your all videos are sponsered by altium 🤣🤣
Banany nanana cucu tu masoni