Monday 26 December 2016

Playing tunes with the Raspberry Pi


This project uses the Raspberry Pi GPIO to generate various musical notes. We are going to get the RPi to play a pre-programmed tune. This is one of 10 projects that can be made with the kit here and e-books is available for the Amazon Kindle here

Tuesday 19 July 2016

Watchdog Timer for the Raspberry Pi

Like all PCs the Raspberry Pi is likley to hang up during operation. In an unattended application where the program automatically starts this can be a problem as there is no one around to restart the RPi. If there is no keyboard or HDMI monitor this is by power cycling. The Raspberry Pis internal watchdog timer has a poor reputaion - there are many comments about it being unreliable. This post presents a simple external watchdog timer.

Monday 25 April 2016

Upto 64 programmable digital I/O for the Raspberry Pi

The newly launched Custard Pi 4 provides 8 digital I/O per board. Each board can be set to one of 8 seperate I2C addresses. When you use 8 Custard Pi 4s you can get upto 64 digital I/O with each pin individually programmable as an input or an output.

Tuesday 12 January 2016

Remote Mains Switch with >100m range

I wanted the capability to switch a flood light fitted outside the garage from the Raspberry Pi. With the Raspberry Pi connected to the internet this would give me the ability to remotely switch this light on from anywhere in the world. I had a look at wi-fi enabled power sockets but none of them had the range I was looking for. This project shows how to use the Dual Remote Relay Tx & Rx to do this as this has a range well in excess of 100 metres.