Multiplexing 7-Segment display scheme with Raspberry Pi as described here can be used as a basis for more complex projects. By adding 4×4 keypad matrix and replacing individual 7-Segment displays with a common anode 4 digit 7-Segments module a simple countdown counter can be built. Similar design based on Arduino platform is available at this … Read more
Simple Waveform Generator based on Raspberry Pi and DAC converter MCP4725 is the topic of this post. It can generate 3 types of signals. Sine, Square and Triangular waves. There is also a basic GUI to control its operation. See attached python code for more detailed information. Similar design based on Arduino board can be … Read more
Basic Frequency Counter with Raspberry Pi can be built in less than 15 minutes and does not require any additional components. The input signal is a square wave with 3v amplitude connected to one of Raspberry I/O pins.Design schematic is shown next. The attached python code measures the time difference between high and low signals … Read more
Generating Sine wave is a relatively simple task. It can be done by adding MCP4725 12bit DAC to Raspberry Pi. For Arduino version based on PCF8591 IC click this link. This setup is based on I2C interface and works by sending 2*Pi radian angle divided by 4096 to a sine function from math.py library. In … Read more
Using HC-SR04 Ultrasonic Sensor with Raspberry Pi is a relatively easy task. HC-SR04 is a very popular module that can provide the distance to the object by sending ultrasonic bursts at 40kHz and measuring the time it takes for the signal to bounce back. Its interface to any micro-controller platform is very simple and I’ve … Read more