Smartphone based on Raspberry Pi Zero

There are many attempts to build an open source phones. This is possible with availability of required modules like GSM, Wifi and other parts. All you need is to put hardware together and take care of software. Of course it sounds easy and fun, but in reality you may face lots of problems starting with selecting components, assembling them in compact shape, writing code. Be sure the end result always be a brick in a hand. Anyway building a phone can be fun and give valuable experience. Arsenijs have shared his interesting smartphone solution in hackaday.io. He used Raspberry Pi zero as base component. He wanted phone to be repairable, cheap and built from available parts. The end declared price is about $50. Phone building blocks consists of Raspberry Pi … Continue reading

NanoPi Neo – Raspberry Pi squeezed down to 40mm

As wit h Arduino, it is becoming hard to keep up with Raspberry Pi variations. There area many sizes, clones and performance choices. And this is great. Friendly ARM have developed pretty neat Raspberry Pi native board called NanoPi. As its name states, the size of board is 40mm x 40mm. Dont be fooled by its small dimensions. It packs everything you may need to run small board computer: CPU: Allwinner H3, Quad-core Cortex-A7 Up to 1.2GHz DDR3 RAM: 256MB/512MB Connectivity: 10/100M Ethernet USB Host: Type-A x 1, 2.54 mm pin x 2 MicroSD Slot x 1 MicroUSB: for data transmission and power input Debug Serial Port: 4Pin, 2.54 mm pitch pin header GPIO: 2.54mm pitch 36pin. It includes UART, SPI, I2C, IO etc PCB Dimension: 40 x 40 mm … Continue reading

Color coded weather forecasting with Raspberry Pi

It is hard to display weather forecasting in compact form especially for longer periods. Text based display would look too cluttered. Color coding looks more promising. AughtNaughtZero have shared his instructable on building 32 hour weather forecasting device on Raspberry Pi. For displaying various weather parameters he used custom 6×16 RGB LED matrix. Raspberry Pi pulls weather data from Weather Underground API using Python script. The each of 6 rows of LED matrix is dedicated to different parameter: temperature, pressure, humidity, wind speed, chance of precipitation, and weather condition arrays. The each column of of each line is spread for 32 hours of data where each dot is color coded to represent the forecasting for two hour period. The python script uses couple libraries and code snippets to handle color … Continue reading

Using Raspberry Pi sftp server

There are several ways of accessing Raspberry Pi files through network. One of preferred ways is to use Secure Copy (SCP). This is a file sending command allowing transferring files over SSH. This is secure way of sending files between Raspberry Pi boards or other Linux machines. In order to use with Windows you need special software like WinSCP. So as you can see it requires additional software to access files from windows. But if you are used to transfer files via FTP, then you have another option – SFTP which is an FTP with encryption. SFTP is already enabled in Raspbian and can be used right away. Be sure that your FPT client supports sftp protocol. For instance FileZilla, Bitvise and same WinSCP clients work without problem. In order … Continue reading

Internet connected power usage monitor

Our homes are filling with energy hungry devices. Some of them are constantly active like fridge, routers, lighting, some switched off or on stand-by. Each of them takes some portion of energy that reflects on the end month bill. Some things you can control, but some not. So in order to hunt inefficient nodes you need some sort of energy usage monitoring. You can find lots of implementations where some are simple indicators, other are advanced and web enabled. TSalwach @ github.com have built his own version of energy monitoring system which looks really promising. His implementation monitors all three phases where he extracts several parameters: RMS Voltages and currents on each phase Apparent power (product of RMS voltage and RMS current) Real (active) power Reactive power with inductance/capacitance indication … Continue reading