Search found 699 matches

by OutoftheBOTS_
Wed Jan 22, 2020 8:31 pm
Forum: ESP32 boards
Topic: ESP32S and adapter board
Replies: 10
Views: 568

Re: ESP32S and adapter board

You can use the power supply from your USB to serial adapter but you will need the 10uf and 0.1uf caps on the 3.3v pin and 0.1uf cap on the EN pin. Caps help to create a stable power supply they store up power when there is plenty then discharge that power if when the power drops to maintain a const...
by OutoftheBOTS_
Mon Jan 20, 2020 11:03 am
Forum: ESP32 boards
Topic: ESP32S and adapter board
Replies: 10
Views: 568

Re: ESP32S and adapter board

If nothing as been flashed to the blank ESP32 module then it won't do anything till you flash something to it. To enter boot mode the boot pin (GPIO 0) needs to be held low during start up. The ESP32 will only startup when EN pin goes high. Normally you would do this with the buttons, you would hold...
by OutoftheBOTS_
Sun Jan 19, 2020 8:41 am
Forum: ESP32 boards
Topic: ESP32S and adapter board
Replies: 10
Views: 568

Re: ESP32S and adapter board

The resistors are pull up resistors usually 10K. Usually you will have to pull EN pin high via a pull up resistor so that when the reset button is pushed it will ground the EN pin and pull it low against the pull up resistor. The EN pin will need a 100nf cap as well for stability on the EN pin, any ...
by OutoftheBOTS_
Sat Jan 18, 2020 3:53 am
Forum: ESP32 boards
Topic: ESP32S and adapter board
Replies: 10
Views: 568

Re: ESP32S and adapter board

I might be interested by the adapters you mentioned if they are plug-n play, without soldering. In the mean time, I would like to try and make my adapters work. Do I need the resistors? Yes they r just plug and play without soldering. The board you already have has some errors. You will need resist...
by OutoftheBOTS_
Fri Jan 17, 2020 9:11 pm
Forum: ESP32 boards
Topic: ESP32S and adapter board
Replies: 10
Views: 568

Re: ESP32S and adapter board

I have used this adapter board before and there is a mistake on the board and it killed my Wroom module. I ended up using this adaptor/programmer board and it works well and no soldering required it just plugs in https://www.aliexpress.com/item/32991118728.html?spm=a2g0o.detail.1000014.12.7e7028735P...
by OutoftheBOTS_
Sat Jan 11, 2020 9:56 pm
Forum: Programs, Libraries and Tools
Topic: Multiaxis stepper motors using RMT
Replies: 24
Views: 796

Re: Multiaxis stepper motors using RMT

If you reach what your after you will have created a motion controller well above anything else on the market. Smooth stepper is a bit of a bench mark for high performance professional motion controllers used by professional CNC machinist. Smooth stepper during setup you have to set the max step fre...
by OutoftheBOTS_
Sat Jan 11, 2020 9:27 pm
Forum: Programs, Libraries and Tools
Topic: Multiaxis stepper motors using RMT
Replies: 24
Views: 796

Re: Multiaxis stepper motors using RMT

At the end of the day you are turning a motor in the real world and the real world never has that high an accuracy. ... I'm perfectly aware of every thing you are talking. But I still want to reach 250 kHz synchronized frame on different output. So, forget the mechanic design for the moment. :)
by OutoftheBOTS_
Sat Jan 11, 2020 8:54 pm
Forum: Programs, Libraries and Tools
Topic: Multiaxis stepper motors using RMT
Replies: 24
Views: 796

Re: Multiaxis stepper motors using RMT

At the end of the day you are turning a motor in the real world and the real world never has that high an accuracy. At 1/32 micro steps on a 200 step motor that is 360 / (32 * 200) = 0.05625 of a degree. These motor doesn't have that kind of accuracy in the real world then also add back lash in your...
by OutoftheBOTS_
Wed Jan 08, 2020 9:05 am
Forum: ESP32 boards
Topic: IR transmitter/receiver
Replies: 14
Views: 1491

Re: IR transmitter/receiver

I have wondered whether this might be done (e.g. on the Pyboard) by using a PWM output to produce a constant 38KHz signal, with two MOSFETs driving the IR LED configured as a simple gate. This would enable another pin to drive the bitstream which is slower and less time critical. One of those thing...
by OutoftheBOTS_
Wed Jan 08, 2020 7:11 am
Forum: Programs, Libraries and Tools
Topic: Multiaxis stepper motors using RMT
Replies: 24
Views: 796

Re: Multiaxis stepper motors using RMT

DRV8825 Stepper Motor Controler IC allow a max step frequency of 250 kHz and up to 1/32 microstepping. Min Pulse duration, STEP high and STEP low is 1.9 µs. So I'm trying to drive this IC to its maximum, in case I need to use 1/32 microstepping resolution and speed. Even if I'm close to reach 250 k...