Blink without delay: Microchip PIC12F683 and 4 leds

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Microchip is one of the most important MCU manufacturer and in our opinion this company produces the best price to performance ratio 8, 16 and 32 bit microcontrollers available on the market. Today we wanna show you how to blink three leds without using the delay macros available in the xc8 compiler “__delay_ms()” and “__delay_us()”. Both delay macros can be very helpful but sometimes it is better to use interrupts instead of to waste CPU cycles with polling. We use a microchip PIC 12F683 (http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en010115) to show you how to use Timer0 to perform more than one operation (apparently) at the same time. Continue reading

Riitek R900

 

R900_COVERRiitek R900 is a professional air mouse presenter with an integrated laser pointer. It works with two AAA size alkaline batteries (included in the package) and can be used with your Android TV box, your notebook, tablet PC and every system capable to works with Windows, Mac or Linux. All the most important control keys are in the front upper side: the laser push button, the volume control, the left and right click buttons of the mouse, the enter command, the UP/DOWN/LEFT/RIGHT position controls. Looking to the air mouse from the back, there is the ON/OFF switch on the right hand side; on the left hand side there is a wheel, useful to scroll pages, which also include a enter key function when pressed. Continue reading

Raspberry Pi vs all

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A comparison of some of the most popular development board available to the hobbyists.

Raspberry Pi is one of the most known board in the hobbyist world and it is easy to guess why: its success is mainly lead by its low and accessible price for a product with very interesting features. Since Raspberry Pi has been introduced on the market, a borderline has been defined and everyone who wants to design and develop a new board which will be appreciated and loved by the worldwide hobbyistic community, must compare its product with the Raspberry, mainly in terms of final price. Continue reading

Raspberry Pi SD slot replacement

NEW_SLOTMaybe you have already experienced the “red LED only” issue with your Raspberry Pi. If you are sure that everything is ok (power supply, SD card, OS files) maybe you have a SD card slot issue: the plastic sides of the original holder could be damaged and the memory card doesn’t have a good contact and your board can’t boot. In such case the best thing to do is to replace the SD slot. Find out an exact part replacement it was really hard however why use again a thin, plastic holder when a better metallic part could permanently fix the SD contact issue? Finally we decided to use this part, made by Wurth Elektronik and available from Farnell: http://uk.farnell.com/wurth-elektronik/693063020911/memory-socket-sd-card-9way/dp/2081361?Ntt=693063020911

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