



Have a look at these voltage drops which at boot stage repeats itself in regular intervals trying to connect to the server.Firstly, I connected 220uF capacitor to power line and here are the results:There is not much difference. But I have connected this 220uF as near as I can to the board and here is the result(waveforms in unit of V):The waveforms have quite improved but by zooming, we can still observe some results of current spike. So, I have connected a 2200uF to the power line, a big electrolytic capacitor according to everyone solves the problem but during boot time, I still see some drops in the waveform. However it could be neglected in my application but I wanted to test one more thing.Two or more capacitors combined together can give a full spectrum filtration and so I combined 4.7uF, 6.8uF and 10uF capacitors and still kept connected 220uF capacitor very near to the board. Here are the waveforms.Results were satisfying!So generally, whenever I connect some sensitive circuits with ESP 8266, I use this combined capacitance on the power line of ESP, connect a 1000uF or at least 470uF capacitance with other devices and a 1A 5V power adapter for the projects. One thing I noticed when using Node MCU with a 5V supply, there were no voltage drops and the waveforms were very clean.I hope you found this article useful. Thanks for reading!