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13 views

Which power measuring device can transfer the absolute value to a Raspberry PI?

Which power measuring device can transfer the absolute value to a Raspberry PI? Most power measuring device provide an LED which flashes 1000 times per kWh, but do not send the complete value. Are ...
0
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1answer
63 views

How to measure mains frequency safely via GPIO

I would like to measure the mains power (120vac/60hz) to know precisely when the voltage drops to 0, but in a safe manner for the pi - one solution would be to use a high-value resistor bridge that ...
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1answer
27 views

Mesure weight using force [closed]

Is it possible to use this force-sensitive resistor to measure weight between 10g-5kg(0,4oz-176oz)?
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0answers
25 views

What represent the devices that vcgencmd measure_clock can display the frequencies of?

With vcgencmd measure_clock <clock> where <clock> can be one of arm, core, h264, isp, v3d, uart, pwm, emmc, pixel, vec, hdmi, dpi one can display the frequencies of these devices. What ...
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1answer
1k views

Are my GPIO ports not working?

On my Raspberry Pi, I tried to do some experiments with GPIO, without success. Measuring the voltage between GND and GPIO11, for example, always helds a result of 0. I am using /sys/class/gpio ...
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2answers
2k views

How do I measure the current power consumption?

Is it possible to measure (with software, like powertop) the current power consumption on my Raspberry Pi?
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3answers
1k views

How to detect whether there is voltage between two points via GPIO?

I'd like to detect whether an external device is switched on or off. I found two pins where there should be 5V between in the first case, but the voltage may vary a bit and I don't wont to break the ...