If the issue is that there's ripple on the output of the phone charger, then put a large electrolytic capacitor across the output (i.e. the power input to your circuit). 1,000uf would work, but something smaller might be fine, too. Be sure to match the polarity (+ to +, - to -).
I am no expert, and it is true that 3dBm is the double, but 1dBm is not. I was expecting to get a bit more with an external antenna. But as I said, I do not know much about this, so my expectations can easily be to high.
@deshipu Is the current of esp8266ex and wemos same? Because nothing rated power or current when I see wemos spec.
Actually, I have a project over flame sensor which the notif will automatically send by email.
And the circuit is like this:
I just know if I want to stabilize the voltage, then I should diode zener 3.3V. But, I also have to calculate how much output current of wemos to determine the resistor.
@wemos@msx@deshipu yea a divider is easy to add on an external board, that is how I also proceeded. But I think more important for the next version is to breakout the battery pin and LDO EN pin would be also very nice, like Adafruit did. I would love to hear your opinion and if there is any plans to update the board, would be epic if we can make a poll or something what to update ? If anyone is interested I am building sumorobots, using the lolin32.
I saw your post last week, but it has taken this long to get a login account on this forum just to reply to your question. I have gotten it to work. I used "ESP32 Dev Module" for my board type.
I also used these settings:
SSD1306 display(0x3c, 5, 4);