Search found 73 matches

by ajocius
Wed Feb 12, 2020 3:53 am
Forum: ESP32 boards
Topic: power supply options with output 5V
Replies: 3
Views: 109

Re: power supply options with output 5V

Can I power ESP32 via that 5V pin instead of using 3.7V power connector socket? This would be simpler solution in my project if it is possible. As I am already using down converter from 12V down to 3.7 to feed ESP32. So instead of adding boost converted in order to get 5V, I could instead adjust 12V...
by ajocius
Tue Feb 11, 2020 7:20 pm
Forum: ESP32 boards
Topic: power supply options with output 5V
Replies: 3
Views: 109

power supply options with output 5V

I have powered Wemos Lolin 32 ESP32 board via power supply (not USB) with 3,3V. I understand USB power input would be 5V, but on power input (which is separate connector) I need to supply 3,3V. Here is my board: https://wiki.wemos.cc/products:lolin32:lolin32 Question, is it possible to use 5V connec...
by ajocius
Sat Jan 18, 2020 10:29 pm
Forum: General Discussion and Questions
Topic: Is switch needed or not
Replies: 3
Views: 542

Re: Is switch needed or not

Have played with pc fan quite a bit today, but could not make it stop completely. I have put both frequency and duty to zero , but fan still spins. I have then found in wikipedia following statement about pwm control: Typically a fan can be driven between about 30% and 100% of the rated fan speed, u...
by ajocius
Sat Jan 18, 2020 1:33 pm
Forum: General Discussion and Questions
Topic: map function
Replies: 3
Views: 503

Re: map function

thank you both!
by ajocius
Sat Jan 18, 2020 1:31 pm
Forum: General Discussion and Questions
Topic: Is switch needed or not
Replies: 3
Views: 542

Re: Is switch needed or not

thanks for response, what does that mean "inside pull up to 5v or 3,3V". I understand that if PC fan draws 5V, then it is not good for ESP32 ? I can't find datasheed for my pc fan online. What is worst case scenario, destroying ESP32 ? I have alraedy used this fan via swithch and PWM output from ESP...
by ajocius
Sat Jan 18, 2020 9:47 am
Forum: General Discussion and Questions
Topic: Is switch needed or not
Replies: 3
Views: 542

Is switch needed or not

I do control PC FAN based on temperature sensor. My routine was to measure temp continuously, once it exceeds threshold, then start the fan, where fan speed depends on temp as well. PC FAN is connected to 12 V power supply via switch. So when temp exceeds set value I send signal to switch to turn it...
by ajocius
Sat Jan 18, 2020 9:29 am
Forum: General Discussion and Questions
Topic: map function
Replies: 3
Views: 503

map function

Is there equivalent in Micropython of map function in Arduino? You can use following function in arduino PWMval=map(sensorVAL, 40, 80, 0, 1023). This function would return PWMval between 0 and 1023 in relation of sensorVal value, that is defined to be in the range 40 and 80. This would be linear cor...
by ajocius
Tue Jan 07, 2020 12:02 pm
Forum: ESP32 boards
Topic: IR transmitter/receiver
Replies: 19
Views: 1858

Re: IR transmitter/receiver

IR module is like this I assume:
https://www.aliexpress.com/item/32692872340.html

Looking for logic level converted I find many different types. Would this work?
https://www.aliexpress.com/item/32308637728.html
by ajocius
Mon Jan 06, 2020 8:36 am
Forum: ESP32 boards
Topic: Connecting to PC via USB, while power supply is ON
Replies: 3
Views: 170

Re: Connecting to PC via USB, while power supply is ON

Great, thank you both! Too many ifs and buts when it comes to power supply, I know too little about protection circuits on my board, but if webrepl solution works, then it is even better :) I have enabled webrepl on my board, but could not see the way to copy over file. I see it now in documentation...
by ajocius
Sun Jan 05, 2020 6:47 pm
Forum: ESP32 boards
Topic: Connecting to PC via USB, while power supply is ON
Replies: 3
Views: 170

Connecting to PC via USB, while power supply is ON

My ESP32 is running on it's own power supply (via 3,3V power input, not micro USB) and has quite few sensors physically connected. Is it ok to connect ESP32 to PC using USB cable without switching off external power supply? I would like to adjust code without dismantling ESP32 from it's current loca...