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Most embedded projects require the same common stuff, basically I/O devices such as switches, LEDs, LCD display, buzzer, etc. Connecting these things on a breadboard for prototyping every new project is time consuming and boring. Recently, I have designed a general purpose I/O experimenter board that will not only reduce the prototyping time for a new project but also free up plenty of space on the breadboard.
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Assembling Easy Pulse kit is pretty simple and straightforward. There are two versions of PCBs which are mostly the same. In the second version the J1 connector has 5 pins instead of 4. I have added an additional VCC pin next to the EN pin. This would allow users to test the board quickly after being assembled. You can activate the sensor by simply placing a jumper between the EN and VCC pins, and the board is ready for operation. While soldering the parts, start with low profile components such as resistors and capacitors. This makes overall soldering process easier.
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When I first built the Heart rate measurement through fingertip project, the infrared LED and photodiode used for finger photoplethysmography were actually from salvaged parts, and therefore, I could not provide specifications for them in the article. As a result of that it takes quite a bit of time to replicate that project with a different set of IR LED and photodiode as the values of the current limiting and biasing resistors may have to be changed for the new sensor to work properly. Today, I am going to talk about a revised version of the same project but with all the
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The goal of this project is to construct a simple 0-9999 seconds count down timer with an alarm and a display. The time is set through two tact switches and the count down seconds are displayed on a 4-digit seven segment LED display. The project uses PIC12F683 microcontroller for all I/O and timing operations and MAX7219 IC for driving the seven segment LED module. The time out condition is indicated by an audible alarm from a buzzer.
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MikroElektronika has released EasyPIC Fusion™ v7 development board that supports three different Microchip processor families: dsPIC33, PIC24 and PIC32. The board is equipped with mikroProg, a fast USB 2.0 programmer and debugger. The board contains Ethernet, CAN, two USB-UARTs, USB host and device connectors, Piezo Buzzer, microSD card slot, stereo mp3 codec, sockets for temperature sensors, analog inputs and much more. Each microcontroller I/O pin is connected to 2 male headers, push button and LED, making it ready for all kinds of development.
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