ESP32

Great Reads

Using the New ESP32 LCD Panel API With htcw_gfx and htcw_uix

by honey the codewitch

Combine some great technologies for rich, responsive IoT user interfaces on the ESP32

Render Professional Screens on IoT

by honey the codewitch

How to take your IoT graphical interface from the mid-1990s into the present

ESP32 DIY GPS Tracker

by deangi

DIY GPS Location Tracker

ml_reader.hpp: A Markup Pull-Parser for IoT and Beyond

by honey the codewitch

Do efficient, low level parsing of markup like HTML and XML

Latest Articles

A DIY Bluetooth Low Energy Temperature and Humidity Server

by deangi

An ESP32 with a temperature/humidity sensor are configured as a bluetooth low energy server to provide remote monitoring

A DIY IoT Power Monitor

by deangi

Monitoring AC loads with CT sensors

A DIY Time Lapse Photography Camera

by deangi

The inexpensive ESP32 platform is used to take periodic photos that can make a time-lapse video.

A DIY Web Enabled Water Meter

by deangi

An ESP32 is used to track water usage and serve web pages with water use data

All Articles

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ESP32

Using the New ESP32 LCD Panel API With htcw_gfx and htcw_uix

20 Mar 2023 by honey the codewitch

Combine some great technologies for rich, responsive IoT user interfaces on the ESP32

C++

Arduino

IoT

ESP32

Render Professional Screens on IoT

27 Nov 2021 by honey the codewitch

How to take your IoT graphical interface from the mid-1990s into the present

ESP32 DIY GPS Tracker

21 Nov 2023 by deangi

DIY GPS Location Tracker

ml_reader.hpp: A Markup Pull-Parser for IoT and Beyond

24 Jul 2021 by honey the codewitch

Do efficient, low level parsing of markup like HTML and XML

An Internet Enabled Analog Clock for IoT (ESP32)

11 Jun 2022 by honey the codewitch

Create a simple synchronized analog clock using GFX, and a bit of code

Stateful Screen Rendering on Little Devices

26 Feb 2023 by honey the codewitch

How to make very responsive, flicker free interactive screens without using a lot of memory

Using GFX in PlatformIO

21 Apr 2022 by honey the codewitch

Take advantage of the PlatformIO repository to easily add GFX to your projects

Save Your IoT Battery with LCD Miser

21 Jul 2022 by honey the codewitch

Easily blank the screen after a timeout period

Big Stuff on Little Widgets: An Exploration of Doing More With Less

25 Mar 2022 by honey the codewitch

On PC platforms, just getting it done is king. On IoT, the trick is doing it in the first place.

C++

Arduino

ESP32

Advanced Streaming on Little Gadgets: MIDI Files

9 May 2022 by honey the codewitch

Explore some streaming techniques while getting your shiny new ESP32S3 to do some USB and MIDI tricks

Writing an X11 Color Picker With GFX

20 Apr 2022 by honey the codewitch

Implement a fancy color picker in your ESP32 WROVER or WROOM IoT applications

A DIY Web Enabled Water Meter

16 Jan 2024 by deangi

An ESP32 is used to track water usage and serve web pages with water use data

Prang: A MIDI "Score Sampler" on the ESP32S3

15 May 2022 by honey the codewitch

Trigger tracks from Type 2 MIDI files to add to your recording or performance

A Web Enabled Smart Clock and Weather Station

16 Jun 2022 by honey the codewitch

Create a clock that uses multiple Internet services to detect your weather, date and time

Compare the address of two function pointers with different signatures in C++?

3 Mar 2021 by k5054

Have you tried reinterpret_cast? e.g.:#include #include int foo(int) { return 1; } int main() { int (*p1)(int) = &foo; void *p2 = reinterpret_cast(&foo); assert(p1 == p2); } I've tested this using...

C++

ESP32

Compare the address of two function pointers with different signatures in C++?

3 Mar 2021 by honey the codewitch

I'm writing some system code for a filesystem driver for an ESP32 based IoT gadget. My toolchain will always be gcc because the ESP32's developer framework requires GCC. The architecture is a known quantity. Portability is no concern. Function...

C++

ESP32

Compare the address of two function pointers with different signatures in C++?

3 Mar 2021 by honey the codewitch

I dismissed that out of hand, without even trying it. It works though. Gosh don't I feel smart today. Thanks!

C++

ESP32

How do I read data from a no-name RFID reader?

5 Nov 2022 by Majestic Frog

Hello everyone! I am currently having a big issue with an RFID Reader. I'm trying to read data from this reader from Amazon right here, which only supports Wiegand 26 an 34 transmissions, using an ESP32 device and utilizing this library from...

How do I read data from a no-name RFID reader?

2 Feb 2022 by CPallini

It looks the library is gathering the bits correctly ( 1204937293 = 0x47D1E24D, you see, the last 3 bytes are shown reversed in the output you posted). but is assuming some particular message format while presenting them. You may have a look at...

Driving Multiple Screens with GFX and an ESP32

22 Apr 2022 by honey the codewitch

How to use GFX to drive multiple screens at the same time on an ESP32

No matching function for call to littlefsimpl

13 May 2022 by V_Jviji

i compiled a LITTLEFS file system code for esp32. But the compilation was not successful. It generate the following error error: no matching function for call to 'LITTLEFSImpl::open(const char*&, const char [2])' File f = open(path, "r"); ...

Arduino

ESP32

No matching function for call to littlefsimpl

13 May 2022 by OriginalGriff

If you look at the GitHub source: Arduino/LittleFS.cpp at master · esp8266/Arduino · GitHub[^] You will see that there are only one signature declared for LITTLEFSImpl::open FileImplPtr LittleFSImpl::open(const char* path, OpenMode openMode,...

Arduino

ESP32

No matching function for call to littlefsimpl

13 May 2022 by Richard MacCutchan

The open function does not take a string as the second parameter, it takes a bit mask of the OpenMode constants. See _open, _wopen | Microsoft Docs[^] for the values defined in Microsoft's stdio.h.

Arduino

ESP32

How do I integrate ubidots into my ESP32 arduino program?

31 Jul 2022 by yoii

Hello, I am starting a MQTT project using esp32 and humidity sensor, I want to be able to send data from my sensor to my Ubidots dashboard, however it is really confusing for me as im a beginner. I would appreciate any form of help to help...

Arduino

ESP32

How do I read data from a no-name RFID reader?

4 Nov 2022 by Member 15820716

w26 generally uses 2 site digits and 4 ID digits with the site sent first, then the ID, BUT each part is sent in reverse order. So if the code is p1 Site1 Site2 ID1 ID2 ID3 ID4 p2 it gets encoded as p2 ID1 ID2 ID3 ID4 Site1 Site2 p1 with p1...

How do I read data from a no-name RFID reader?

5 Nov 2022 by merano99

Found the statement that the library usually passes the order of the bytes as they come in over the data lines. There should be readers that can invert the read data, otherwise you can write a function that inverts the bytes (BIG- LITTLE ENDIAN...

A DIY Bluetooth Low Energy Temperature and Humidity Server

26 Feb 2024 by deangi