Electric imp based automatic door lock

Marcus built this automatic door lock for his office, which uses the Electric Imp and a RC servo to lock/unlock the door.

When we, PinMeTo, moved in to our office at MINC in the beginning of September we only had three keys to four persons and an extra key cost 500 sek so i built an automatic door lock for the door. Maybe cheaper to just buy an extra key but not as fun.

Automatic door lock

Automatic door lock

Microchip introduces the PIC16(L)F170X and PIC16(L)F171X family of 8-bit microcontrollers

Microchip Technology Inc., a leading provider of microcontroller, mixed-signal, analog and Flash-IP solutions, today announced from EE Live! and the Embedded Systems Conference in San Jose the PIC16(L)F170X and PIC16(L)F171X family of 8-bit microcontrollers (MCUs), which combine a rich set of intelligent analog and core independent peripherals, along with cost-effective pricing and eXtreme Low Power (XLP) technology.  Available in 14-, 20-, 28-, and 40/44-pin packages, the 11-member PIC16F170X/171X family of MCUs integrates two Op Amps to drive analog control loops, sensor amplification and basic signal conditioning, while reducing system cost and board space.  These new devices also offer built-in Zero Cross Detect (ZCD) to simplify TRIAC control and minimize the EMI caused by switching transients.  Additionally, these are the first PIC16 MCUs with Peripheral Pin Select, a pin-mapping feature that gives designers the flexibility to designate the pinout of many peripheral functions.  The PIC16F170X/171X are general-purpose MCUs that are ideal for a broad range of applications, such as consumer (home appliances, power tools, electric razors), portable medical (blood-pressure meters, blood-glucose meters, pedometers), LED lighting, battery charging, power supplies and motor control.

PIC16F170X/171X family features

PIC16F170X/171X family features

Step-by-step guide for making a very simple temperature and humidity meter with 7-segment LED displays

In this blog post, I am providing you step by step instructions to build a very simple temperature and relative humidity meter for indoor use. All you need to build this project are an Arduino Uno or compatible board, a DHT11 sensor, and a MAX7219 based 8-digit serial 7-segment LED display. The temperature is displayed in degree Celsius and relative humidity in percentage.

Temperature and Humidity meter

Temperature and Humidity meter

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DIY battery backup for your Raspberry Pi

This project is about making a battery backup circuit for Raspberry Pi computer and prevent any abrupt shutdown during power failure. It also allows to safely turn the device off if the main power supply doesn’t come back after a preset time interval (controlled through software). The battery switches to automatic charging mode during the normal operation.

Power supply backup for Raspberry Pi

Power supply backup for Raspberry Pi

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