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Netduino Day 5 – Writing to an SD Card
Expandable memory is always a plus no matter whether it’s a Phone, Camera or a Microcontroller. Even advantageous if we know how to use it. In this fifth day Netduino tutorial, we will learn a few...
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New version of MAX7219 based 4-digit serial seven segment LED display
This (SPI7SEGDISP4.40-1R) is a revised version of the previous SPI seven segment LED display (4 digit) board that displayed numerals and decimal points. The new version has a better quality seven...
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I2C EEPROM plus Temperature Sensor breakout board
This tiny breakout board carries Microchip’s 24LC512 EEPROM and MCP9802 temperature sensor devices, both of which support I2C protocol. This board can be used for both sensing the ambient temperature...
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Mini breakout board for PIC16F88/628A/1827/1847 are back in stock at Tindie
More mini breakout boards for 18-pin PIC16F series microcontrollers are now available as DIY kits on Tindie. Key features: On board Reset switch and decoupling capacitor High quality PCB (manufactured...
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SPI7SEGDISP8.56 kit is now available with blue seven segment LED displays
SPI7SEGDISP8.56 is a MAX7219 based serial seven segment LED display module that allows you to add 8 digits of seven segment LED displays to your project using only 3 I/O pins, and provides full control...
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TrH Meter kits are back in stock at Tindie
TrH Meter is a DIY digital room thermometer plus hygrometer that displays temperature and relative humidity on 4 large (1 inch) seven segment LED displays which adjust their brightness level according...
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Driving multiple LCD displays through an I2C interface
Jesus Echavarria tipped us off about his latest project of controlling multiple HD44780 LCD displays through an I2C interface. He used Microchip’s MCP23017 I/O port expanders and successfully drove...
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1Hz to 10MHz frequency meter using ATtiny2313
This AVR-based Frequency Meter is capable of measuring frequencies from 1Hz to 10MHz with 1 Hz resolution. The hardware of this project consists of seven 7-segment displays, AVR ATtiny2313 uController,...
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Netduino Day 6 – Read SD card and send info to a Serial Port
In our earlier tutorial, Writing to an SD Card, we learned to write to an SD card. As you might have experienced, in order to see what’s been written, we need to pop out the SD then connect it to a...
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Easy Pulse board used as biofeedback for virtual jogging
Sergej Stoetzer and two of his students just finished their virtual jogging project, where the Easy Pulse board has been used to provide a biofeedback to their system. They interfaced an ear-clip...
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Digital timer relay using PIC18F4620
Mark Weir from Australia sent us his revision of our Programmable digital timer switch project. He modified the original code, which was written for PIC16F628A, to incorporate it with PIC18F4620...
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MCP9802 temperature sensor and Arduino
MCP9802 is a digital temperature sensor from Microchip that measures temperatures between -55°C and +125°C to a digital word. It provides an accuracy of ±1°C (maximum) from -10°C to +85°C. The MCP9802...
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MAX7219-based double row 4-digit seven segment LED display
This display board (SPI7SEGDISP8.56-2R) features eight 7-segment displays arranged in two rows of four digits. The on-board MAX7219 driver enables you to control all LED segments through only 3 I/O...
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Easy Pulse (Version 1.1) Sensor Overview (Part 1)
The Easy Pulse sensor is designed for hobby and educational applications to illustrate the principle of photoplethysmography (PPG) as a non-invasive optical technique for detecting cardio-vascular...
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Easy Pulse (Version 1.1) Sensor Overview (Part 2)
In Part 1 of this article, we briefly discussed about the principle of Photoplethysmography (PPG) and its applications in retrieving vital information about the cardiovascular system. The Easy Pulse...
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Netduino Day 7 – RGB LED color formation using Pulse Width Modulation
Pulse Width Modulation (PWM) is a digital method of delivering a varying amount of power to a load, and hence can be used to control the brightness of an LED or speed of a DC motor. Controlling the...
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Making a 8×40 LED matrix marquee using shift registers
LED matrix displays provide flexibility to display text, graphics, animations, and video, and therefore, they have become a popular mean of displaying information these days. You can see them at gas...
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Easy Pulse Sensor is now also available from Elecrow
Easy Pulse, a DIY pulse sensor based on the principle of photoplethysmography, is now also sold by Elecrow, our China-based collaborator, for only $18.50 and ships world-wide through a registered...
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Weekend offer: 30% OFF on 8-digit (double row) SPI 7-segment LED displays
We are offering 30% OFF (coupon code BDEA254) on SPI7SEGDISP8.56-2R this weekend (May 31 – Jun 2, 2012). SPI7SEGDISP8.56-2R is a MAX7219-based seven segment LED display board with 8-digits which are...
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PC-based heart rate monitor using Arduino and Easy Pulse sensor
The heart rate, also referred to as pulse rate, has been recognized as a vital sign since the beginning of medicine, and it is directly related to a person’s cadiovascular health. Today, we are going...
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