ESP8266 Community Forum

- Tue Jan 22, 2019 6:51 pm #80222 Thank you very much for the advice. Yep, the power supply isn't a trivial issue and just like yourself, I made a lot of experiments until I started to get proper responses from the module. Well, checking my supply here with a DMM, the AC reads 1~2 mV. It is a well designed and regulated voltage with filtering caps. So, you suggest adding that electrolytic cap across the power lines of the module?

Be careful with power supply. Even though your fluke meter would say 3.34VDC, it does not mean it will ALL work. Mine was working EXCEPT on the wifi functionality. I could not ping the ESP8266!!

I learned it the hard way. Good thing I read some threads here and pointed to check your power supply.
Mine was reading 3.34VDC, but the AC part was around 50mV, so there is so much ripple. I made my own power supply but I got lazy on the capacitors. So I jumpered it with an electrolytic with capacitance of 47uF. Low and behold it worked! Now I can ping it and Alexa can recognize my device. Sweet feeling after that!
My AC now becomes 4mV.
Happy designing!

- Thu Jan 24, 2019 8:33 am #80247

but I just don't see how you suggest dropping the whole uC

I wasn't suggesting dropping your STmicro, please notice the phrase:

Normally I would also suggest to drop

Since I don't know anything about your product or how many I/O's and processing power it needs, I obviously can't suggest dropping anything (most of the people here want to use an ESP with AT FW in conjunction with an Atmel/Arduino, which is most of the time pretty silly).

Assumption is the mother of all f*ckups. At least: that's what I'm assuming.