Search found 19 matches

by bobolink
Sat Aug 11, 2018 12:01 pm
Forum: General Discussion
Topic: FreeRTOS alternatives
Replies: 5
Views: 942

Re: FreeRTOS alternatives

Any update?
Not on the RIOT boards list.
http://doc.riot-os.org/group__boards.html

I’m going to learn this OS on an Adafruit m0 board but would like to switch to an ESP32 at some point.
Thanks
by bobolink
Mon Aug 06, 2018 11:32 pm
Forum: General Discussion
Topic: iOS BLE example to help start ESP32 project?
Replies: 3
Views: 182

Re: iOS BLE example to help start ESP32 project?

Two resources: https://learn.adafruit.com/crack-the-code?view=all Uses Adafruit products https://www.bluetooth.com/develop-with-bluetooth/build/developer-kits/bluetooth-starter-kit Uses a Raspberry Pi The first is a good introduction. The second is sort of a course with labs, etc (Requires email reg...
by bobolink
Thu Aug 02, 2018 12:57 pm
Forum: ESP32 Arduino
Topic: How to hide BLE in ESP32?
Replies: 6
Views: 334

Re: How to hide BLE in ESP32?

Again, not sure if solicitation is the kind of hiding you want but ANCS is an iPhone BLE service which must be solicited. Here is someone talking ANCS implementation on the ESP32 with Mr. Kolban
https://github.com/nkolban/esp32-snippets/issues/430
by bobolink
Thu Aug 02, 2018 12:02 pm
Forum: ESP32 Arduino
Topic: How to hide BLE in ESP32?
Replies: 6
Views: 334

Re: How to hide BLE in ESP32?

I think it has to be supported in the BLE implementation on the ESP32. It’s optional. The ESP32 isn’t “found” because it isn’t advertising (transmitting) its services all the time. Its receiver is listening for a certain transmission, if heard then it starts advertising as a normal peripheral. It’s ...
by bobolink
Tue Jul 17, 2018 11:37 am
Forum: General Discussion
Topic: How to set ADC sampling rate of ESP32?
Replies: 5
Views: 306

Re: How to set ADC sampling rate of ESP32?

I wanted to keep costs low by using no external peripherals to the ESP32. Just external analog conditioning components in front of GPIO 34. I sample at 8ksps, use a software interrupt and two cores. Ping-Pong buffers. Mostly DAC examples but one mic talk-through using ADC. The software sampling tech...
by bobolink
Thu Jul 05, 2018 12:42 pm
Forum: ESP32 Arduino
Topic: How to hide BLE in ESP32?
Replies: 6
Views: 334

Re: How to hide BLE in ESP32?

iOS has BLE services that are sort of hidden (like time and battery services). They don’t want to waste battery advertising them if you don’t need them.
You find them by knowing a long UUID a priori. The process is called service “solicitation” in the BLE specification. If that is any help.
by bobolink
Sat May 12, 2018 9:04 pm
Forum: Showcase
Topic: "Talkie" text-to-speech for ESP-32
Replies: 1
Views: 495

Re: "Talkie" text-to-speech for ESP-32

I converted the “Talkie” Library without knowing much about it. Someone in the General Discussion section of this forum asked for help in getting it to work on the ESP-32. But I researched the project today and it has a whole story. It emulates the Texas Instruments TMS5220 chip which was used in th...
by bobolink
Fri May 11, 2018 8:25 pm
Forum: ESP32 Arduino
Topic: Sound recognition
Replies: 3
Views: 1796

Re: Sound recognition

This might be of interest: https://youtu.be/OStljy_sUVg
Claims to go up to 16 KHz but ESP-32 ADC accuracy over 6 KHz falls off.
Those cheap electret microphones are usually good to 8 KHz before they fall off.
I guess it depends on what sound you want to detect and resolution you need.
by bobolink
Thu May 10, 2018 9:29 pm
Forum: General Discussion
Topic: ESP32 and AUDIO(text to speech)
Replies: 1
Views: 225

Re: ESP32 and AUDIO(text to speech)

I posted a conversion in "Showcase" https://www.esp32.com/viewtopic.php?f=17&t=5670 The only file changed was Talkie.cpp But the file is now not backward compatible with the other Arduino processors. The ESP-32 can't work with everything in the interrupt handler so I split it up. Set u...