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Here is a very simple digital watt meter using the Arduino platform and ZXCT1010 current sensor. The author used Arduino nano V3 board for this project. The project displays output voltage, load current, and output power (watts) on Nokia 5110 LCD screen.
Read moreWe 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 arranged in two rows of four. The MAX7219 allows you full control of all the digits and decimal points through three I/O pins of a microcontroller. The communication interface is SPI-compatible, and the brightness of the LED segments can be controlled through software. Key Features: 3-wire SPI interface double row of 4-digit displays (0.56″) operates at +5V supply individual control of all digits and decimal points 16 levels of
Read moreEasy 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 parcel for less than $5. We encourage international buyers to get it from Elecrow because they can save money shipping, and the shipment comes with a tracking number. US customers, however, would still be able to buy it from our Tindie store. If you are not familiar with Easy Pulse, “Easy Pulse is a DIY pulse sensor that can be used for detecting the cardio-vascular pulse wave from a fingertip.
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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 microcontroller, while hardware and overall functionality remain the same. Here is a link to download his modified version of the firmware written in MikroC compiler. Download Firmware
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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 sensor to the Easy Pulse board to detect the heart beat during virtual jogging. The output of the Easy Pulse board goes to a Lego Mindstorms NXT-Brick, which in turn hits the Arrow Up key on a keyboard connected to PC. On the PC, a Google Street view is opened which moves forward every time the Arrow Up key is hit. So, the idea is to give you a
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