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TOPIC: Current Sensing - Best Approach Advice Needed

Current Sensing - Best Approach Advice Needed 4 years 1 month ago #17346

  • Baldor
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Then you must do what hackers do. Open the pump circuitry, and get the signal that starts the motor from here. No aditional circuitry needed. (or very little)
Aprendiz de mucho, maestro de casi nada.
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Current Sensing - Best Approach Advice Needed 4 years 1 month ago #17347

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Baldor wrote:
Then you must do what hackers do. Open the pump circuitry, and get the signal that starts the motor from here. No aditional circuitry needed. (or very little)

HA HA! Like what I did once with a PC fan motor that did not have a RPM line, and I wanted it's speed reported to the fan controller. I'm not qualified, believe me.

Current Sensing - Best Approach Advice Needed 4 years 1 month ago #17351

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The pump should be a lot easier than the fan, believe me. :-)

Just find the cables that lead to the motor and measure voltaje.
Aprendiz de mucho, maestro de casi nada.
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Current Sensing - Best Approach Advice Needed 4 years 1 month ago #17356

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Baldor wrote:
The pump should be a lot easier than the fan, believe me. :-)

Just find the cables that lead to the motor and measure voltaje.

So what I need to do is have a transistor maybe, or something that can use the 12vdc the motor is fed with, and control a gate that provides a 3.3v logic-level signal that logic high when the motor is on, and logic off when the motor is off. I have used transistors to control higher voltages and current, but never the other way around. Any advice or circuitry you can offer?

Thank you sir!

Current Sensing - Best Approach Advice Needed 4 years 1 month ago #17357

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Use a voltage divider, as jon said.
Aprendiz de mucho, maestro de casi nada.

Current Sensing - Best Approach Advice Needed 4 years 1 month ago #17358

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Baldor wrote:
Use a voltage divider, as jon said.
I had missed that. Would dividing it down to 6vdc then using a 3.3v zener diode work? I want to get the signal to 3.3v for the ESP8266.
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