ESP8266 Community Forum

Or even just tell me if you've managed it with standard configuration?

The ESP8266 only takes 3.3 Volts. You should supply this by taking it from the 5V relay, top right corner, which is 3.3V.
Please see attached picture for the connections. http://members.ziggo.nl/janwillem.maas/flashing-esp8266.html
My own learnings:
- ground the GPIO0 pin to start the flashing mode, but after you do the grounding, repower the ESP unit
- ensure the serial port is not used by other program, such as Coolterm (on Mac)
- for some USB to TTL converters you need to reverse connect TX and RX
- ensure you have 115200 baud rate set on Arduino IDE

mk05406 wrote:I received a response back from the manufacturer, seems the relay does not make use of the GPIO ports of the ESP at all. Rather, they use an on-board MCU (STC15F104W) @ 9600 baud to activate the relay.

Hope this helps someone in the future.

Hi I am interested in knowing how you program the on-board MCU (STC15F104W)
can you do this using the Arduino IDE? And did you have any luck in getting this to work with the ESP8266?

I have hooked up an ESP8266 directly to the opto isolator input on the following relay module
http://www.ebay.com.au/itm/5V-1-Channel-Relay-Board-Module-Optocoupler-LED-for-Arduino-PiC-ARM-Black-K4W1/282589714187?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D47324%26meid%3D72ae616bba1d41f1aac2b5b86752dc07%26pid%3D100005%26rk%3D2%26rkt%3D6%26sd%3D191903763048&_trksid=p2047675.c100005.m1851

See photo http://rupert.id.au/iot/

On the Amazon Sales page for this board from lctech there's a small description of usage, but there's also a link to the schematics, and a longer word .doc file with more details
https://drive.google.com/drive/folders/ ... 2VPRGszMGs