Circular Buffer in Python
A circular or ring buffer is a fixed-size data structure that is commonly used in real-time software applications to store a pre-defined number of values. The analogy of a ring with a fixed number of positions is quite useful to capture the FIFO (First-In-First-Out) nature…
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Pulse Rate Monitor with Raspberry Pi
Pulse rate can be detected using a variety of physical principles. One way of doing it is by applying infrared light to one side of the tip of your finger and sensing the “output” on the other side with a phototransistor. The blood flow through…
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Python Modules and Packages
When you start writing more complex code or creating classes and functions that you use all the time, it makes sense to have that code inside a Python module. If you have been following my blog, there are two modules that I created that I…
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LED Dimmer with Raspberry Pi
In this simple hardware setup, we will explore different coding possibilities using a Raspberry Pi with only a push button and an LED. It will be a good opportunity to compare Python classes vs functions, with code that shows the benefits of the former. More…
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Curve Fitting with Tangent and Inverse Tangent
The inverse tangent (arctangent) and tangent functions are quite helpful when it comes to fitting data that characterize the response of some types of sensors. Sensors that transition between two saturation states can have their transfer function (relationship between input and output) represented by the…
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Line Tracking Sensor for Raspberry Pi
Robots that can follow a line on the floor (more specifically AGVs – Automated Guided Vehicles) have been around for quite some time now, moving around in factories and warehouses. The most basic ones follow a magnetic embedded tape or an actual line painted on…
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Band-pass Filter
A band-pass filter attenuates both low and high frequency components of a signal and therefore, as the name suggests, allows for a band of frequencies to pass through. In this post, we will briefly go over an analog implementation of this type of filter by…
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Joystick with Raspberry Pi
A two-axis joystick is an input device that can be used to simultaneously control two degrees of freedom of a system, such as roll and pitch on an aircraft, or the X and Y coordinates of a cartesian robot. The Keyestudio KS0008 joystick discussed in…
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Ultrasonic Sensor with Raspberry Pi
An ultrasonic sensor can be used to detect the distance to an obstacle placed in front of it. The HC-SR04 sensor is an affordable option with fairly good accuracy for measurements between a couple of centimeters and a couple of meters. While primarily designed to…
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Temperature Sensor with Raspberry Pi
Let’s go over the application of a linear temperature sensor with the Pi. Keyestudio provides the analog LM35 sensor, with a sensitivity of 10 mV per degree Celsius, and a range between 0 and 100 degrees. While primarily designed to take advantage of the Arduino…
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7-Segment LED Display with Raspberry Pi
These types of LED displays are quite popular and can be used to add a visual output to a Raspberry Pi automation project. In this post, I will be talking about the KS0445 4-digit LED Display Module from keyestudio. While keyestudio kits are primarily designed…
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DC Motor Characterization (2 of 2)
Picking it up from where we stopped in the previous post, let’s see how we can determine the effective moment of inertia, the effective damping and the torque constant for the reduced order model shown in the diagram. Before we start, it’s a good idea…
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