Search found 17 matches

by unknow005
Wed Jan 29, 2020 6:07 am
Forum: ESP32 Arduino
Topic: ESP32 Bluetooth LE - disconnect after 10 seconds
Replies: 0
Views: 737

ESP32 Bluetooth LE - disconnect after 10 seconds

Dear community, I have working Bluetooth LE code for communication between ESP32 and Android / Windows 10 App. I am using these Arduino libraries: #include <BLEDevice.h> #include <BLEServer.h> #include <BLEUtils.h> #include <BLE2902.h> The only problem is that connection least only 10 seconds. After...
by unknow005
Thu Aug 01, 2019 11:19 am
Forum: Hardware
Topic: Brownout prevention circuit
Replies: 11
Views: 7327

Re: Brownout prevention circuit

Do not worry! You helped me very much. I will find a different LDO by myself - At least I will learn it by myself.
by unknow005
Thu Aug 01, 2019 5:10 am
Forum: Hardware
Topic: Brownout prevention circuit
Replies: 11
Views: 7327

Re: Brownout prevention circuit

Hello,
almoset every regulators have multiple packages. I can customize the PCB. Components may not be available in my country other than in yours.

What about: AP2114-3.3 (SOT-223) ... looks same like LD1117 for me

Thank you.
by unknow005
Wed Jul 31, 2019 1:32 pm
Forum: Hardware
Topic: Brownout prevention circuit
Replies: 11
Views: 7327

Re: Brownout prevention circuit

Dear mikeymoy,

I preferm linear stabilizators because of minimal external components. Which parameter should I look at if I want use it for ESP32?
I need 3.3V with minimal 500mA because I use only Bluetooth LE (no Wifi).

Thank you.
by unknow005
Tue Jul 30, 2019 5:31 am
Forum: Hardware
Topic: Brownout prevention circuit
Replies: 11
Views: 7327

Re: Brownout prevention circuit

Thanks mikemoy, I did not notice that LD1117 is slow. Which cheap 3.3V regulator would you recommend?
by unknow005
Fri Jul 19, 2019 5:34 am
Forum: Hardware
Topic: Brownout prevention circuit
Replies: 11
Views: 7327

Re: Brownout prevention circuit

Thank you pataga.
Large capacitor and slow discharging sounds logically. I do not want to add another component to my circuit. I have added big capacitor because of wifi voltage interference but now I am using only bluetooth so I will remove it. For bluetooth it is useless.
Thanks.
by unknow005
Mon Jul 15, 2019 5:29 am
Forum: Hardware
Topic: Brownout prevention circuit
Replies: 11
Views: 7327

Brownout prevention circuit

Dear community, my ESP32 board reports a brownout detection ONLY while connecting and disconnection it from the power source. I belive my power source has all neccessary components but maybe I miss something? - Power source is standard adapter with output 5V/1A - ESP32 is powered via LD1117 LDO regu...
by unknow005
Fri Feb 22, 2019 6:35 pm
Forum: ESP32 Arduino
Topic: Broken I2C communication while using wifi!
Replies: 10
Views: 5846

Re: Broken I2C communication while using wifi!

Today we tested it with an oscilloscope and the spikes from ESP32 are everywhere. Looks like DC-DC convertors are not right solution. Just between two grounds, each at other side of PCB, we measured around 10mV. That is not OK. The circuit must be redrawn - I will use LDO instead. ESP32 is very bad ...
by unknow005
Thu Feb 21, 2019 7:20 pm
Forum: ESP32 Arduino
Topic: Broken I2C communication while using wifi!
Replies: 10
Views: 5846

Re: Broken I2C communication while using wifi!

So I tryed to add some capacitors but it did not help. One weird behaviour is, when I put my hands closer to the DPS, the number of wrong values are greatly reduced. Maybe this is the reason of my problems, but I do not know what to do ... Any ideas?

Thanks.
UK
by unknow005
Thu Feb 21, 2019 1:35 pm
Forum: ESP32 Arduino
Topic: Broken I2C communication while using wifi!
Replies: 10
Views: 5846

Re: Broken I2C communication while using wifi!

This is the weirdest part! I have two separate power source lines from one 12V power input - first 3.3V used directly ONLY for ESP32 - and second 5V for all other components. So the ESP32 is connected only by ground and I2C and ISP communication wires with other components. So the 5V power should no...

Go to advanced search