How to solve the out of memory error when compiling for ESP32. This will occur even when you’ve only used 1Mb of memory and you should have up to 4Mb! If you’ve seen other solutions and they didn’t work for you then try this – as I’ve had the same […]
This project will allow an ESP32 to access online weather forecasts for display on an E-Paper display, running on batteries with an always on display. Cheap Lithium Ion batteries will give around 1.5 to 2 weeks service, better quality or better capacity will give you potentially several weeks. The video […]
The BME280 based pressure and temperature sensors have an amazing accuracy for their price point (around 5USD, 5Euro, 5GBP or cheaper!) and they are incredibly easy to connect up and use. Both I²C or SPI busses are usually supported. Below is the one similar to those that are readily available. […]
The BMP280 based pressure and temperature sensors have an amazing accuracy for their price point (around 1$USD, 1Euro, 1GBP or cheaper!) and they are incredibly easy to connect up and use. Both I²C or SPI busses are usually supported. Below is the one similar to those that are readily available. […]
This version fixes some bugs and adds an additional master volume option. Most of this work is courtesy of two subscribers. One of which did some significant bug fixes, especially on making the library work whilst writing to EEPROM. I only fixed one minor bug. But they don’t want any […]
E-Paper (or E-Ink) displays are remarkable devices. They require very little power when up-dating and no power at all once updated. The also provide a paper like contrast and clarity. Which is why they were adopted by e-readers a long time ago. Here we look at hooking them up to ESP32’s.
This article should be used in conjunction with the video below; In this article you will discover how to get your ESP32 to monitor and report on it’s own battery level. Handy for battery powered projects. All your require are two resistors (anything from 1K upwards, I generally use 10K). […]
Using one of these screens with an ESP32 is very easy and requires little change over using then with an Arduino except that the connections are different. This article should be used in conjunction with the video below. The ConnectionsThe SDA connection goes to pin 21 and the SCL to […]
This latest version adds the ability to speed up or slow down the playback speed of a WAV file, either by setting the speed before playing or actually changing the speed on the fly whilst it’s playing! A supporting video is available below and the new library is available on […]
Driving a Speaker – Adding an Audio Amplifier (Adding the PAM8403 to a MCU) Piezo speakers (see here) are great where you don’t need high quality or loud sound or indeed where space is at a premium. But for anything else a small (or even large speaker) is the only […]
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