This shows the moisture sensor from my previous entry with one exception – I added the USB Serial port. I have used various serial ports for debugging in the past, but never the USB despite I have always had it on my boards (almost always) – I simply never took the time to figure out…
It’s spring and summer comping up, and I am spending a bit of money on flowers every year so I would like to know more accurately their condition. Weather can change from very hot to very wet and not all plants get what they need from rain – some plants also get to much water…
This picture shows my current development ratnest of a moisture sensor connected to a LoRa unit. It’s a few extra components that have nothing to do with this project, but it’s a good reminder why I seldom do breadboard ratnests anymore. The wiring failure trate is very high, but in this case it worked out…
This block diagram only illustrate a few of the modules in the Abstraction Layer – loads of more will be added as needed. I started this library years ago so it has existed in various versions, but are re-designing it to be cleaner now. This is a C++ library designed to make coding of user…
If you have ever written a driver or picked up someone elses code you will recognize the need for documentation and examples on how to use it. I am writing loads of drivers these days and stugle with Vendor datasheets as well as HAL’s – usually I end up hacking and trying to understanding how…
I typically code ESP32, ESP8285, a lot of STM32, Pico, Linux and Windows to mention a few, so I want to be able to move code between those platforms with a minimum of hazle. For this purpose I create a C++ API that I call “Abstraction Layer”. I did not want to use the word…
I am working on “alDisplay” that is my embedded abstraction class to LCD/TFT diplays. This is quite a challenging task because I will have to deal with how specialized and proprietary these displays are and on top of that performance. The drawing above illustrate four layers – in my case actual hardware (orange) and three…
This is an error! in my wisdom I decided to always select a SPI Flash not realizing that CS signal mark the beginning and end of each command. nCS needs to be connected to a GPIO pin for SPI based memory to work.
Ferrite RAM is one of the older RAM techniques used on old mainframes dating back to the 60s, but have in recent years also been popular as a replacement for EEPROM and flash because it is fast and have close to unlimited rewrites. I recently purchased a bunch of FRAM chips with the same interface…
One of the challenges I face using wireless communication is that it requires a bit of power/time to send signals. Wifi : ESP-M1 is the first solution I evaluate. This is the smallest of the ESP modules and can send using 120-170mA. Simply speaking if you have a battery with 1000mAH or( 1AH) you can…