Having had a wonderful weekend at Wuthering Bytes, I decided to try and install the fabulous Node:RED tool and try to use it with mqtt to tweet the light level. Firstly Node-RED depends on node.js, so I installed node.js via Chris Lea’s ppa – he seems like the right sort of person to package up […]
Read More…Author: gareth
Fixing Technics 1210’s
A friend of mine rang up the other day and asked if I could help fix a Technics 1210 record deck. For the uninitiated, these are the decks that DJ’s around the world use (or used to use) for mixing old fashioned shellacs (sorry, records). Now you may think that playing music by spinning an […]
Read More…Transistor calculations for a 12V 300mA light via raspberry pi gpio pin
I am following this excellent page as a guide: http://teachmetomake.wordpress.com/how-to-use-a-transistor-as-a-switch/ Using it, I worked through my use case of an raspberry pi connected to a TIP120 to drive a 12V LED light. diagram from http://ctheds.wordpress.com/2007/10/30/tip-120/ What value of resistor should I use? I’ve seen several different values on web examples, so looks like I need to actually […]
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