Rui Santos is from Portugal 😁 my country 😁 I used his tutorials in the past, it's very well explained. Great video 👍 best regards.

Hi, Ralph - so glad to see you "discovered" ESP-NOW - as you mentioned it is a very useful and versatile light weight protocol. I believe it has been in the examples included with the ESP32 and ESP8266 board packages for quite some time now. I have used it in a project for a remote control for a fleet of smart cars based on 32s and 8266s. It is very adaptable - I use 1 transmitter to send to the various cars with a button on the remote control selecting which MAC to send to. In most of my ESP-NOW projects I use the AP mode of WiFi and assign each receiver (slave) a hard-coded MAC of my own choosing (note you need to assign odd addresses only). The ESPs allow you to have 1 MAC for STA mode and another for AP mode. This eliminates any hassles trying to get the MAC address and doing the auto discovery included in the example sketches. Things get to be a little more fun when combining MQTT and OTA with ESP-NOW.. I found I had to do a normal WiFi setup in STA mode and then init MQTT followed by OTA using this single WiFi init. Then I did an init of ESP-NOW using AP mode ( removing the WiFi.disconnect(); ). The examples in the boards package showed me how to make an array of the esp_now_peer_info_t slave variable. It is important to note that the transmitter and receiver need to be on the same WiFi channel - preferably a channel not being used by other applications such as MQTT. Here in Canada I use ch 1 for ESP-NOW. Amen to your comments on the IDE 2.0. It's handling of the Serial Ports in not real graceful. So for I have not seen any support for OTA uploads which is my favourite way to upload (eliminates Serial Port hassles). I actually contributed to the Arduino 2.0 project - they have their own ideas of what they want to do. Your idea of using an ESP-01 as a temperature sender sounds nice but left me scratching my head - I think the ESP-01 doesn't bring out the A0 pin. I took you recommendation re JLB PCB and did a couple of boards... (including a programmer for the ESP-01 and another for the LGT8F328P ( as well as ATmel ) based boards. Quite nice - they supported me quite well.. I installed a local router on my Linux system and was very impressed with the speed. Just recently I wanted to do some more boards and found that the integration with LCSC seems to be suffering... something about LCSC's move to a new facility which seems not to have been resolved yet. Anyway, Ralph - keep up the good work and Stay Healthy.

As I am aging gracefully, my hearing is declining so I can no longer hear the front doorbell. So, I placed an 8266 connected to a radar unit to register someone entering my drive and send a broadcast ESP-Now message to another unit in the house on my desk. This is connected to a relay that switches a piece of LED Christmas lights to flash on and off. Never miss a delivery now. Cheap and simple. I am currently playing with a third unit, an ESP-Cam module to hear the broadcast signal and trigger it to take a picture of the drive. I can also add as many esp8266 units around my 'estate', i.e. the back garden, to act as a 'perimeter defence' against cats and squirrels that are eating my strawberries...bstards!

Ralph , excellent video. Can't wait to get started. Thanks to Rui Santos and you of course.

ESP_Now is magic! I wanted to put a beacon transmitter in each of our family's cars so that, during darkness hours, the outside lights would automatically come on for 3 minutes when one of the cars arrives home. There are no street lights where we live and lots of trees which - when we have windy weather - annoyingly spuriously trigger PIR lights all the time. I was going to use Bluetooth and had a working beacon and receiver code set using the ArduinoBLE library - but then I found out about ESP-NOW and it seemed so much simpler than the multi-layer bluetooth approach with its connections and services and so on - much more suitable for my application. It worked first time and every time and connects just as fast (or perhaps even faster) than Bluetooth - and using a pair of ESP-32 WROOM boards the range is very good, the message stream from the car is received almost immediately the car is within 100 feet of the house. I did want to use an ESP-01 (8266 and tiny) for the car end of this, but I could not find a way to get ESP-Now working on 8266 using Arduino IDE (which seems a common experience) so eventually gave up and used ESP32 both ends. Very impressed with the speed reliability and range that this protocol offers.

Great video - I think that's exactly what I need for a new "add-on" to my existing "PIR and wired 🤨" burgler alarm - I'm NOT for wiring any more !

Hi Ralph, great video, welcome to Club ESP-Now :) One of the major benefits I have experienced in using ESP-Now is the super fast boot and connect times. I have a bunch of ESP8266 based temp/humid sensor around my house that I was powering from 5v mains USB adapters. I tried using batteries but over standard wifi the quickest I could get them to connect to Wifi and send their data was about 7 seconds. This gave me a battery life of about a month at most when powering the device from a CR123A battery, even with deep sleep. By using the ESP-Now protocol my devices wake from deepsleep every 5 mins and send their data in less than 0.25 second. So far my sensors have now been running on a CR123A battery for nearly 10 months.

Welcome back, Mr. Bacon. Your videos are always the highlight of the day :)

I was about to embark on creating my own BLE and WiFi unified comms package/function to do exactly this... Turns out I don't need to now as this solves all my problems, this is great, thanks 👍

Supporting others... It's great.

Excellent. I really learned a lot from these videos. They are very interesting and very entertaining. Who needs Netflix? I tried the esp-now and it waited for the while loop to finish on the receiver before running the on_receive_call_back. I had to put my receiver routines in a sperate task to get the esp-now to be responsive without any delay.

Thanks, as ever, for providing more food for thought! I now realise that MQTT messaging would be overkill for scenarios where this is more suitable. I highly recommend the BME280, but it does have an Achilles' heel -- the humidity sensor in it isn't suitable for "non-condensing" (i.e. outdoor) environments. It'll fail into a mode where it says the humidity is permanently 100%. Temperature and pressure readings from it seem to be unaffected. Knowing this might just give a few more considerations for how / where to install the sensor. I also endorse Rui Santos' site. Lots of good stuff there. Always a good starting-point for "how do I...?" situations. Looking forward to your next video, of course!

Great video thank you for sharing

Very informative video Sir

Thank you for this great video! I see a big advantage in protecting my wifi and in case of credential change of wifi AP! Sensor data converted to mqtt is my aim!

I've been trying to send data between two of my ESP8266's using an API bridge. What a mess ! Thanks to Rui and you I'm going to drop that like a bad transmission and try this method !

Thanks Ralph

Most interesting, now to integrate this to one's WiFi - I await your next instalment

Hi Ralph, I hope you're doing fine and keeping healthy. Keep up the good work TTYL.

Im using ESP NOW for my diy christmas lights by having a master ESP32 running the main lights sequence and controlling 3 other ESP32s with ESP NOW comms to trigger remote sub sequences that are in time with the main sequence on the master. Works great!

More like Xmas 2120 Ralph. Haha. Great video brother.

hi fella.wow that was a really good video :) i love the way you explain things was you ever a teacher???? im so pleased you took the time to have a look at this, i was blown away when i first got something working. is just so much quicker and you will see the battery last a tad longer oh and p.s. i found the range much better too. top stuff your a star.. see you soon :)

Very interesting Ralph. Could also be used if no accesspoint is nearby (in the field or so)

Great video. And also more secure I think, because it is not connected to the main wifi network. Outdoor 250m@300baud is a great distance!

ESP-MESH is another useful communication protocol that does not require access to the WiFi router. In practice, both ESP-NOW and ESP-MESH had a range of 250m between stations.

Very good one, just a suggestion, you can use touch pin feature of the ESP32 to make project more interesting and touch control features in it. Again many thanks for your inspiring video, I learned lot you are hero.

Thanks for this! I wonder if the ESP-Now is completely independent of the Bluetooth? ..or e.g. is the PA shared, so that the BT would have to be suspended, if only for a short time?

Hi Ralph. I was intrigued by this feature (ESP-NOW), so i started to test around a little bit with using more than 1 struct, and it seams to work with sending and receiving more than just 1 struct. Sometimes you do not want to send or recieve everything in 1 struct. I will post my code for 2 ESP8266 (sender and reciever based on your tx and rx code) soon if it seams to work reliably.

Hi Ralph, I have used the BME sensors in a couple projects now and they are great I think the BMP version is cheaper but dosent have humidity, may be wrong way round !.....cheers.

I think the receiver should have a state that is known unless it gets no temperature data. It could use a local sensor as a fallback or it could assume temperature is high enough or use some fixed (low) heat or whatever. Failing remote sensor should be assumed to happen and some reasonable working condition should result. I think esp-now is a great idea for this kind of stuff because it does not depend on wifi working or not. Thanks for another good video that can give a lot of ideas for other people too. I think esp-now should work along the wifi too. (never used it though). That could be usefull for example if you want OTA updates but sensor data not relying on wifi.

Hope you're doin well. Definitely a nice alternative to the nrf wifi network. Stolen/Borrowed some codes myself to get my picamera to detect motion and send me alert pics.

What is the distance range over which these boards will communicate? Thanks for another interesting video!

I am eager try JLCPCB because besides being cheaper per PCB their most economical shipping is far cheaper than my current supplier but I’m waiting on the world wide parts shortage to get better and let them do most of the smt assembly for me. My choice of microcontroller isn’t in stock at the moment. Thanks for all the videos! I have some 5 year old esp32’s still sealed in the bag. I was wondering (asking everyone ) will flashing the firmware fix that old security issue I read about a couple years back?

Note the subtle difference in the names of the ESP-NOW libraries used by the ESP32 and ESP8266

Being English, I read from left to right, so it seemed odd that you'd put the receiver screen on the left ie before the transmitter. A silly thing to bug me, but it did. And then I noticed you swapped them at the end. You're trying to scramble my brain, aren't you?

ESP-NOW is cool. I even tested it with other devices [ outlet, light switch not made by me] and it responded. It doesn't have a good range < 30 feet / 9 meters. Maybe I can have all my devices check-in on each other?

so the receiver can have a list of mac addresses (more than 1) that it can connect to ? which is needed if using more than 1 sensor (bme280)

I like your explanations. I'm new to ESP8266 and ESP-NOW and I have an issue. Starting with the Rui Santos receiver code, I: - Added an unsigned long variable to save the value of millis() in the Callback Function. - Added an if statement to evaluate (millis() - lastReceivedMillis

Does the ESP-Now only work as master / slave or can it act as a transceiver too? It would be good to know the range indoors and outdoors with ESP-Now. Can you secure ESP-Now with a wifi type WPA protocol?

Hello Mr. Bacon, is it possible to use the ESP8266 to send tv remote control codes from one 8266 to one in another room? What I'm trying to do is replicate the pulses from the TV remote control from one room to control the cable box in the other room. I know you can use the 8266 to control TV's but is there a way to do it from different rooms? Thanks you so much for all the information you provide, I have learned so much from watching your channel.

Exciting. Just to understand: ESP NOW is just code and doesn't need specific ESP's to work. Right?

They are called Transmitter and Receiver but both devices transmit and receive. It is interesting that only the "receiver" mac address is required. Maybe some sort of broadcast acknowledgement by the receiver? Thanks for the tutorial.

a low overhead wifi based protocol. nice. loads of questions, like "how many stations?", etc. I wonder what happens if you put the mac address of, oh say, your router or other wifi device, on the receiver, the transmit a dummy packet. Do you get a response? could be used for a sort of presence detection like has been done with bluetooth beacons, but active checking not just, I haven't heard from this in a while so I'll assume it is gone". "Hey! Ralph, the wifi garden gnome has gone missing".

The real fun starts when you use ESP-Now to build a mesh network so you can send messages to a master through a different paths when a path is not available for a moment. Through a broadcast, you can tell everybody your MAC address. It will be received by everyone which is listening and in reach.

Hi sir , how i do program ESP-NOW in one way between three nodemcu esp 8266 , master send message to Slave 1 then slave 1 send message to Slave 2

If I may suggest that a heartbeat be implemented for safety reason. For example the receiver must receive a message insaide a time interval and if not receive a message safe turn off the heater.

Can this be used between MIXED MCU ... from ESP8266 to ESP32 and vice versa?

Great info, cheers. You tried the DS18B20 probe?

😍😍😍

1.Do espnow work on AI Thinker esp boards or only on espressif ? 2. Is there any difference in range of espnow with Case 1 : esp32 +esp32 Case 2: esp8266 +esp8266 Case 3: esp32 and esp8266

gee whiz... i just get started on the esp-32 and now esp-now...??? while working with opencv/AI stuff... there has to be more than just setting up pcb... thanks for the great info...:)

Ok, anyway. I am looking for a way to send data to my computer from a ESP32 wireles, how do I do that? I see that both receiver and transmitter are connected to a computer, I guess that I need to connect the ESP32 to a battery so I can power it, but I am not sure how to get all of that done.

I have a same issues for setting up a simple wireless water level sensor for the reciever is not giving the value input? How can i fix this?

11:23 I guess they are using one of ESP32 multiple timer to create that loop, it will save CPU loop time and dedicated resources to other tasks.

Can I send accelerometer data values using espnow

I am wondering if anyone has tried ESP NOW and ESP Rainmaker on the same ESP32 ? Could not find any info regarding that

i tryed making a simple pager system with this and seems to be getting there.. i got 1 sender unit going and a few receivers doted about :)

Really liked this one. Could you do another please and show Arduino cloud ? I've started looking at the Arduino cloud and it looks interesting.

Bit late to the party! Next try OTA via ESP-Now via ESP-Mesh for a device 2 miles away

Whats the max distance between the esp's ?

Thanks for the video. Questions: 1) What if the master device has no knowledge of how many slave deices are out there when waking up? Is there a away to send "who is alive" and get the MAC addresses of all alive slaves? This can prevent the need to hard code the MAC addresses. 2) is there a way to communicate from Windows/Linux to ESP-NOW device?

Is it possible to use a single esp as slave and gate way?

Hi sir please post more videos

Can you give me the code for ESP8266 transmitter ?

DOOD!

No Arduino time please 🥺. Can't wait to talk both network

Why did my comment about esp now got removed?

what is scary is the idea that the manufacture put in a communication that is below our awareness or our control.

hmmmm how about spoofing?

Arduino is not user friendly. Free rtos is!

someone, can you help me, with the library or document.h like esp_now.h? I don't find it