Search found 167 matches

by danielm
Thu May 07, 2020 9:36 am
Forum: ESP32 boards
Topic: measure relative distance between devices through wifi or bluetooth (COVID19 application)
Replies: 2
Views: 294

Re: measure relative distance between devices through wifi or bluetooth (COVID19 application)

Distance estimation can be done using RSSI of received BLE advertisments from other devices. I think there are some hackable smart-watch or smart-bands available on the market which are based on nRF52. This platform can run MicroPython as well. In that case you would not need to develop custom hardw...
by danielm
Thu May 07, 2020 9:26 am
Forum: ESP32 boards
Topic: ESP 32 - is it possible to use W5500 ?
Replies: 3
Views: 308

Re: ESP 32 - is it possible to use W5500 ?

My understanding is that you can still use socket API of the Wiznet chip if you write a driver for that. It just won't be exposed to lwip. Am I right?
by danielm
Tue May 05, 2020 5:44 pm
Forum: ESP32 boards
Topic: ESP32 auto reset circuit
Replies: 13
Views: 3821

Re: ESP32 auto reset circuit

I managed to find some solution. I will see in the future if it is reliable enough.

It is described here:
https://www.esp32.com/viewtopic.php?f=12&t=15461
by danielm
Mon May 04, 2020 8:41 am
Forum: ESP32 boards
Topic: ESP32 auto reset circuit
Replies: 13
Views: 3821

Re: ESP32 auto reset circuit

@Roberthh Reset is triggered immediately after the the FTDI chip is connected to USB cable/host. The chip is powered from bus. I think it is related to power-on state/sequence of DTR and RTS pins. @tve You are right regarding two use-cases of the interface. The idea was not to expose reset and flash...
by danielm
Sun May 03, 2020 3:03 pm
Forum: ESP32 boards
Topic: ESP32 auto reset circuit
Replies: 13
Views: 3821

Re: ESP32 auto reset circuit

I built custom board with FTDI231X and above-mentioned auto-reset circuit. Works with esptool without any issues. However, in my application I need to have the ESP32 running continuously (powered from different power source than USB). When necessary I want to be able to connect to REPL via USB conne...
by danielm
Wed Apr 15, 2020 7:18 am
Forum: Programs, Libraries and Tools
Topic: OLED with SSD1322 controller
Replies: 3
Views: 1028

Re: OLED with SSD1322 controller

I am familiar with SSD1306 driver and used it a lot in the past. However SSD1306 is limited to 128*64px and I was in need of something bigger. SSD1322 does not support I2C, only SPI and parallel. Yes, I was also thinking to adapt SSD1322 library for CPython. I should have hardware with 3.12" 256*64p...
by danielm
Fri Feb 21, 2020 8:00 am
Forum: ESP32 boards
Topic: New ESP32 development board DMtech DEV01 with NB-IoT interface
Replies: 9
Views: 2345

Re: New ESP32 development board DMtech DEV01 with NB-IoT interface

Sorry, no progress on this board. Are you able to manufacture by yourself if I share gerbers and BOM?
by danielm
Wed Feb 12, 2020 7:38 am
Forum: Programs, Libraries and Tools
Topic: OLED with SSD1322 controller
Replies: 3
Views: 1028

OLED with SSD1322 controller

Is there any driver/library for OLED display with SSD1322 controller? Usual resolution is 256px * 64px.
by danielm
Fri Oct 18, 2019 12:53 pm
Forum: General Discussion and Questions
Topic: Decoding BLE Scan Results
Replies: 8
Views: 1539

Re: Decoding BLE Scan Results

The string is not BLE address but probably iBeacon UUID, which is encoded in the message. Some resources on how to decode BLE advertisments: https://www.silabs.com/community/wireless/bluetooth/knowledge-base.entry.html/2017/02/10/bluetooth_advertisin-hGsf https://www.blueupbeacons.com/docs/WorkshopB...
by danielm
Tue Aug 20, 2019 11:15 am
Forum: ESP32 boards
Topic: Flash Esp32 from another Esp32
Replies: 2
Views: 394

Re: Flash Esp32 from another Esp32

I am also interested in this.

The goal: To build tester device based on MP which would be able to flash specific firmware into target device.