Archive for the ‘Electronics’ Category

DC motors (Part 3)

Part 1, 2, 3 Now that we managed to get rid of (most of) the spike generated by the opening the supply line of the motor, let’s look at this plateau which happens just after the spike. From the pictures in the previous post, we have been able to observe that the voltage of this […]

DC motors (Part 2)

Part 1, 2, 3 Time for code ! Let’s write a few lines of trivial code in order to drive our controller (Check previous post). You probably heard about the analogWrite() function which is very convenient for generating PWM. Well, we will not use it ! Is it because it is too easy ? It […]

DC-motors (Part 1)

Part 1, 2, 3 DC-motors are every where in many form factors, many performances and configurations. The aim of this series of posts is not to cover all aspects of DC-motors as there are so many publications available, most of them being of excellent quality. Firstly, I will concentrate on the most common brushed DC-motors . Next […]

Last minute Xmas present… a storage box!

Time for tidying up my bench ! As electronic components are getting smaller and smaller, the need for suitable storage boxes emerges. Here is the description of an original storage cupboard that I designed for SMDs as well as for very small mechanical parts such as watches spare parts. Here is the picture captured from FreeCad that I […]

Random number generator (Part 2)

Part 1, 2, 3 Here is a noisy signal sampled at 100 kHz with an Arduino UNO. The signal has 8 bits of resolution and the divider bridge of the final amplifying stage has been set so that the ADC range matches (without exceeding) the input signal range. Here is the illustration of a vector of 1024 […]

Random number generator (Part 1)

Part 1, 2, 3 As I was stumbling the web looking for advanced information on thermal noise, I found some very interesting papers on RNGs, aka Random Number Generators. These devices feature hardware components which are responsible for a generating unpredictable random numbers ! This is a very interesting matter as it involves physics, electronics, […]

Ultrasonic scanner (Part 2)

Part 1, 2 Most of the electronic diagram shown here should look familiar to the readers of arduinoos posts. The ultrasonic sensor is added to what was described as the test bench for stepper motors. Here is the list of the required components: An Arduino UNO baord (Should I introduce it to you ?) A […]

Ultrasonic scanner (Part 1)

Part 1, 2 And now, something completely different : here is arduinoos’s ultrasonic scanner ! This ultrasonic scanner results from the combination of two main components: an ultrasonic sensor and a stepper motor. Both have already been covered in this blog (here and there). Both component form the head of the scanner which is screwed on top […]

Stepper Motors (Part 7)

Part 1, 2, 3, 4, 5, 6, 7, 8 This post is about driving stepper motors. In the previous posts I described the various components involved in motorized assemblies featuring stepper motors. However, putting all these nuts and bolts together may lead to unexpected results. In my case, these defects where related to the use of stepper […]

Tips and Tricks (Part 26)

Previous T&T Building a tracking device is no big deal for the Arduino enthusiasts. All you need is an Arduino board (e.g. a UNO), a GPS shield and a GSM shield. Too bad, we have a problem here because of the pin-out of the shields. The GSM shield uses pin 2 and 3 for the Rx and […]