loboris wrote:The smaller capacitor (0.1 uF - 1 uF) is there to deal with high frequency noise (it should be ceramic). If the the larger one is ceramic or low-ESR tantalum, you can probably omit the smaller one.

Cool, learnt alot, very appreciated!

loboris wrote:Try to put 0.1uF + 22uF (or greater) in parallel close to ESP32 Vcc pin.

Haven't got a 22uf in arm's reach, therefore tried 0.1uf+1000uf. and it works like charm.

and then we tested add 1000uf only, and it works as well without observable difference in performance. Is 0.1uF a must have?

Sorry for late reply, just back from national holiday. We have got the 1uf between vin-gnd, 2.2uf between vout-gnd. We left a jumper to bypass the HT7833 for testing, as the skech below. 微信图片_20180926140634.png We are using ESP-WROOM-32. Vout then connects to 3v3 and all the sensor's vcc, while at t...

We try to design an application powered by one 14500, 3.7 lipo. At early tests, we prefer ht7833 to ams1117, as the drop-out voltage of ams1117 is up to 1.3v. We tried as many ldo regulator as possible and finally choose ht7833. However, three of the test boards all failed after we upload the code. ...

nice one

I am trying to connect esp32 to a BNO080 through i2c. The code and bno080 have been tested successfully with Arduino, and there is something weird happening when move to esp32. The bno080 is connected to 21 22 with 10k pullup from 3.3v. and I am sure the code is fine. but, only one in five times I r...

That will definitely be an option, but not ideal one, as dc-dc's efficiency is by average 70-80%, a lot of waste. Not with good quality switching boost converter that has 70-90% efficiency depending on IC. It will convert to nice output depending on how strong current your lipo can provide. and you...

Erm, no, provided that the LiIon can provide the 500mA spikes (most can do this) and you don't feed any other really noisy things from it, there's no need for such an outrageously large capacitor. The datasheet suggests an 1uF cap on the input and a 2.2uF cap on the output. I think, for the output,...

- HT7333 chips can only output 250mA. You need at least 500mA to be able to provide peak power for the RF bits in the chips. - The dropout voltage of this chip can easily reach >1V (@250mA) which means the ESP32 and the flash chip will only get 2.7V. While the ESP32 likely is OK with it, this brown...

Deouss wrote:I remember having similar issues - try connecting lipo to 5V boost converter and then connect to 5V input plug

That will definitely be an option, but not ideal one, as dc-dc's efficiency is by average 70-80%, a lot of waste.