This could be the shorted blog I’ve ever written! We’ve been talking about ESP8266 recently and as I was running out of boards, I sent off for some of these from AliExpress – my favourite store next to Ebay. At a total cost of just over £3 they had to be worth a go.
So on the LEFT you see the reset button – on the right you see the FLASH button – this might indicate that normal Arduino-style programming doesn’t work… so I put it to test with a sample BLINK program.
When the board comes on – the normal blue light on the ESP12 flickers – nothing unexpected there. I tried programming from the Arduino IDE – nothing - mind you I was expecting that. I pressed the reset and FLASH buttons together and let go of the RESET then the FLASH button – I started the programming – the blue light flashed – success. As I was using the standard Arduino blink sketch, I tied my LED+RESISTOR to ground and GPIO13 and sure enough – the light flashed.
Just to be sure as these WERE cheap, I tried all three of them. No problems at all.
for the board itself – the lettering on the top is utterly messed up – someone wasn’t thinking when they did the screen print – however the lettering UNDERNEATH is just fine. The regulator used is one of the larger ones and so should handle a little extra 3v3 if this is needed for any peripheral boards. I’d not recommend driving the board from 12v however! I did my testing powering the board from the microUSB connector. No problem. There IS another LED on the board but it didn’t do anything when programming – no doubt at some point I’ll be doing something and it will light up at which point I’ll update the blog.
And so there it is – next I have some WEMOS D1 Mini boards on the way from Ebay.