3 x ESP8266-01S ESP-01S Serial Wireless WLAN WiFi Transceiver Module 80MHz 1MB Flash 5V with ESP8266 Relay Adapter compatible with Arduino Including E-Book!

Did a little bit of searching and found the free E-book they talk about. The device didn't work at first but when I stepped away and returned to try again, after a mug of tea, I realised I had not fully understood the instruction on my first attempt. Once I followed the instructions it worked instantly.I can't comment on the WiFi range because I have all of the building with strong signal, so the device will respond perfectly in that environment.Now onto the next problem - remembering what I purchased them for!

These are the version with just an optoisolator (no processor which needs serial data) so switching pin 00 works perfectly. I'll be ordering more

Arrived very quickly.Very small board about 3.5cm * 2.5cm * 1.5cm.Unlike some other comments here my board just had a relay, EL817 photo coupler and a AMS1117 3.3V voltage regulator and no serial chip so I believe the relay is operated from GPI00 on the ESP8226 (script suggests that also).There is a small blue LED on the board which lights when the relay is on.Relay has common, NC and NO terminals.Relay board needs 5V DC supply.Unlike others I found the WIFI on the 8226 was ok, distance from WiFi to where I located the relay was around 150 feet with the WiFi in the house behind a window and the relay in a stable.The only real gripe I have is the screw connectors for the input DC were VERY tight.The script provided worked fine but it was using DHCP (which wasn't convenient as the IP address can change). I made a few small changes:IPAddress ip(192, 168, 1, 150);IPAddress gateway(192, 168, 1, 1);IPAddress subnet(255, 255, 255, 0);WiFi.config(ip, gateway, subnet);WiFi.begin(ssid, password);to fix the IP address.I was connecting relay to a 12V system so I also bought a 7805 voltage regulator as shown in the photos.Relay can be turned on/off with http://192.168.1.150/RELAY=OFFBiggest issue I had was I'd not used the ESP8266 before and I didn't realise:"GPIO02 must be grounded while booting, in order to allow the chip to enter programming mode. To do this create a bridge between GPIO2 and GND. This bridge must be removed after programming."Without this the Arduino IDE always fails to upload the code.

Don't be distracted into thinking this is high-quality or even German.1) its Chinese2) the German documentation is WRONGThe e-book comes with sample code. firstly the code is clearly a cut-paste from elsewhere and contains bugs, namely the order of the commands to specify network address and enable network. as supplied it will nearly always attempt to DHCP. reverse those two commands and it will at least fire up with a static IPNo 2, and this is the biggie, the e-book tells us that the relay is toggled by the GPIO pin on the ESP8266 module. It is not. Their is NO CONNECTION between the 8266 module and the relay! The actual connection is via a serial bus via an STC15F104 on the relay board. There is no mention of this is the supplied e-book!For anyone else struggling to work out why their board isn't performing as advertised i have attached the manufacturers schematic of the board so you can see for yourself how its wired up.Vorsprung Durch Technik LOL

The relay board functions seems to be GP0 has to be 0v to make the relay change and the blue led lights so happy with that. I wasn't interested in the firmware of the ESP so wanted to program with my own program, but couldn't. The board even if reset didn't flash the LED or provide any serial output. i.e appeared DOA. The whole thing was only £4.99 so will order a replacement ESP from another supplier. It looked OK, some joins looked a bit grey but looked complete. I have seen other reviews with defective esp boards.

I ordered 2 sets of 3 devices. I received all 6 quickly. Sadly one ESP-01S refused to connect for upload. Nothing jumps out as being wrong with it. No visible dry joints etc. All of the 6 relay boards clicked away merrily using one of the functioning 5 processors.I read other reviews that are now a few years old. The relay boards must now be different from those reviewed by Brian Hall. I know this because the relay IS now controlled by digitalWrite( RELAY, LOW );This is an update. It is not a criticism of his review. There are other people that said similar things on the web => the board has changed.The main issue that I had (using platformio on visual studio code) was that the ESP-01S' built in LED is on pin 2. I assume that this is a platformio thing (referring to an earlier ESP-01 with 1MB memory)My Hello World (blinky led on processor board + simultaneous relay clicker)#include <Arduino.h>// Bin the incorrect definition of the built in LED's address - saves a compile warning from next line#undef LED_BUILTIN// Actual built in LED's pin for ESP-01S as delivered to me#define LED_BUILTIN (2)#define RELAY 0 // relay connected to GPIO0void setup(){ pinMode(LED_BUILTIN, OUTPUT ); pinMode(RELAY,OUTPUT); Serial.begin(9600);}void loop(){ // Make relay go tick every 5 seconds. Change state of LED at same time while ( true ) { // put your main code here, to run repeatedly: digitalWrite( LED_BUILTIN, LOW ); digitalWrite( RELAY, LOW ); delay( 5000 ); digitalWrite( LED_BUILTIN, HIGH ); digitalWrite( RELAY, HIGH ); delay( 5000 ); }}So I'm pretty pleased with my new toys even if they're no longer bleeding edge technology

The item received was not the simple ESP-01 controlled relay module shown and described in the A-Z Delivery Booklet but the more complex and less versatile module controlled by a STC15F104W microprocessor that just uses the ESP-01 as a wifi link and nothing more.Google "Duinotech Smart WiFi Relay Kit - Jaycar" for coding and technical description.

Recomendo.

Dieses Board mit ESP-01S funktioniert gut mit Tasmota.

Ik en velen op het internet hebben het probleem dat deze relais samen met een ESP8266 module in een lus van aan/uit graakt... Dit zou zijn omdat de "GPIO0" pin voor het sturen van de relais bij opstart van de ESP8266 module niet naar "GND" mag gelinkt worden of deze komt in programmeer modus. Nu omdat deze gebruikt word als aansturing van de relais doet dit een beetje vreemd en start de module telkens opnieuw op en dus schakelt de relais constant aan/uit. Als je handig bent kan je zoals op de foto de baan van "GPIO0" onderbreken en deze verbinden met "GPIO3" en dan werkt deze perfect :)

dans la partie déclaration, (en dessous de #define) ecrivez :byte relON[] = {0xA0, 0x01, 0x01, 0xA2};byte relOFF[] = {0xA0, 0x01, 0x00, 0xA1};// Attention ! Réglez leSerial.begin (9600);dans la partie programmation écrivez : Serial.write(relON, sizeof(relON)); // pour allumerSerial.write(relOFF, sizeof(relOFF)); // pour éteindre

Oggetto molto interessante, sicuramente non per neofiti - il che spiega forse alcune delle recensioni più critiche.Aquistati a scopo "didattico", li uso ormai da un anno anche per la domotica e le piccole automazioni e devo dire che si sono dimostrati molto affidabili.Personalmente avrei gradito molto un paio di input on-board.Come piattaforma di sviluppo, conoscendo bene lua, ho optato per nodemcu.