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More SPI 4-digit seven segment LED displays are available

Posted on December 8, 2012 by R-B Leave a comment

Four digit SPI 7-segment LED displays are back in stock now on Tindie. The board has been revised from its earlier version and now contains an additional header connector to cascade multiple displays. The new header provides access to DOUT pin of MAX7219 driver IC. If you want to add a seven segment LED display to your project without giving up too many I/O resources, this board allows you to do that using only 3 I/O pins and it costs only $10. Tindie buying link for SPI 4-digit seven segment LED display

New Easy Pulse boards with red solder mask

Posted on December 2, 2012 by R-B 3 comments

New Easy Pulse PCB boards are now available with red solder mask. You can buy PCB only for $5.00, PCB+TCRT1000 sensor for $7.00, or complete Easy Pulse kit for ($15.50), and are available on Tindie. Tindie link: Buy PCB only Tindie link: Buy PCB+TCRT1000 If you buy a full kit you will receive all the parts to assemble the board, which will look like as shown below. Tindie link: Buy complete kit Easy Pulse board provides a reflective IR sensor with necessary instrumentation circuit to illustrate the principle of photoplethysmography as a noninvasive technique for measuring heart rate. It uses the TCRT1000

Making a simple clap switch

Posted on November 25, 2012 by R-B 49 comments

A clap switch is a fun project for beginners. It switches on and off electrical appliances with a sound of clapping hands. Today we will discuss about making a simple clap switch that operates when it detects two clapping sounds in a row. It uses an electret microphone as a transducer for converting a clapping sound into an electrical signal. The microcphone output is amplified by a transistor and is then sent to the PIC12F683 microcontroller which performs an ON/OFF switching action when valid claps are detected.

More Easy Pulse kits are available now

Posted on October 12, 2012 by R-B Leave a comment

All the Easy Pulse kits from the first lot were sold out pretty quickly. More kits are available now on Tindie. If you are interested to get one, you can buy it from here: https://tindie.com/rajbex/easy-pulse-a-diy-pulse-sensor-based-on-photoplethysmography/ Documentation Assembly instructions

Mini project board for PIC12F series microcontrollers

Posted on October 10, 2012 by R-B 2 comments

The 12F series of PIC microcontrollers are handy little 8-pin devices designed for small embedded applications that do not require too many I/O resources, and where small size is advantageous. These applications include a wide range of everyday products such as hair dryers, electric toothbrushes, rice cookers, vacuum cleaners, coffee makers, and blenders. Despite their small size, the PIC12F series microcontrollers offer interesting features including wide operating voltage, internal programmable oscillator, 4 channels of 10-bit ADC, on-board EEPROM memory, on-chip voltage reference, multiple communication peripherals (UART, SPI, and I2C), PWM, and more. The following project board is designed for fast

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