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. […]
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 […]
If you haven’t read the previous article (part 1) then I suggest you follow this link otherwise this write-up won’t be of much use! In the last article we got the screen and the MAX30100 pulse/oximeter up and working. In this one we’re going to add everything else! A video […]
This article supports a video on the build of the Star Trek Sick Bay project (external you tube link). You should watch that video as well as this article as it contains information not mentioned below. This is part one of a two part write up. Doing all this on […]
When you want some movement a motor is usually the first item you’ll turn to, yet they need some caution when working with micro-controllers or indeed any controlling electronics. If you’re looking at driving stepper-motors or servo motors then see these articles (steppers, servos) . This article and supporting video will look at driving analogue motors like the ones shown below;
These small cheap devices (pic below) are extremely useful in many situations where you want to know is something is close by, whether that be an object or a black/white line etc. They work by sending out an IR beam and looking for it coming back. Therefore it has to […]
In this video we will look at how to use cheap servo motors with our Lego, and use an Arduino to control it. (although the theory is applicable to any MCU). In the next article we will look at IR proximity sensors and use them both together in a Lego […]
This article shows how to use the MCP4725 DAC (Digital to Analogue Converter) on an Arduino. Arduino’s like many other MCU’s lack this useful functionality.
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