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by huskybloke
Sun Oct 21, 2012 8:57 am
Forum: Automation, sensing and robotics
Topic: 3 wire Retroreflective Photoelectric Sensor Switch
Replies: 7
Views: 3839

Re: 3 wire Retroreflective Photoelectric Sensor Switch

hi A safe and easy option is to use the 12volts output from the sensor to power a small relay which can then switch whatever voltage the pi likes. This gives the element of isolation between the 12volt and the pi. You might also consider a small diode (1n4001) across the relay coil to protect the se...
by huskybloke
Wed Oct 17, 2012 9:19 pm
Forum: Automation, sensing and robotics
Topic: GPIO Data Logger
Replies: 66
Views: 24607

Re: GPIO Data Logger

Hi
just a thought but if the signal to be monitored is full wave rectified mains then it will effectively be at 100hz . Will this be a problem when measuring fast changes?

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