ESP8266 Community Forum

I am creating an autonomous Wifi environmental sensor by using BME280 and a cheap SSD1306 OLED.

So far, ESP works fine, meaning that it connects to my access point and gets an IP address from DHCP. Also the OLED works fine too.

I am running into some issues.

1. I can't find an appropriate library to make BME280 to work. I was able to do this successfully on arduinos but no luck with the ESPs. I have tried the BME280 library and the Adafruit one with no avail. Wiring is correct, it's only 2 pins SDA/SCL which connect to the GPIOs: 0,2 on the ESP module. I first thought it was the OLED which connects at the same pins but then I thought that it's i2c so it will be just fine.

2. My usb connection stops working after disconnecting and re-connecting USB on a macbook. I've read that USB power is not sufficient to power the ESP8266 and considering I've also connected an OLED, it might be the issue. Anyone that has faced the same issue ?

Thanks in advance for the replies !

I have successfully used the BME280 with the ESP. Although I used a ESP-07 rather than the 01 and used the Adafruit library. I found the lack of pins on the ESP-01 also caused me issues, especially as at least GPIO0 needs to be pulled high on boot. I assume you have tested with just the BME280 attached to I2C?

I have never had success from running the ESP from USB, in fact I have had many issues with powering it and have experimented with many different batteries and regulators. On boot up it draws a lot of power which I don't think standard USB can cope with. I generally use LiPo batteries and a regulator capable of at least 200ma which work great, but you might need to add a few caps, a 100nf ceramic as close to the ESP power pins is certainly recommended.

BME280 can be jumpered for two different i2c addresses (to be compatible to bmp280).
Check default address in library, breakout boards come with both configurations.

Hi,

which GPIO of ESP-07 you used to connect SSD1306 through i2c.