1
\$\begingroup\$

I am creating a circuit which is controlling a solenoid valve and I was wondering what is a safe distance to keep this circuit from the solenoid valve. Circuit includes an ESP module and some other deep components like resistor capacitor and some TIP122 transistor.

I am planning to keep the solenoid valve within 5 millimetres of the circuitry and the solenoid valve takes around half an ampere current and is controlled by a 12 volt DC.

Would the electromagnetic radiation from the solenoid cause any harm to any of the components or ESP microcontroller?

\$\endgroup\$
2
  • 2
    \$\begingroup\$ if you do a proper design 0mm. it depends on your circuit and how you drive the coil.... Best is a current controlling PWM signal slight above human ear frequency... 16-20kHz. Nothing a normal µC should bother. \$\endgroup\$ – schnedan Oct 11 '20 at 12:22
  • 3
    \$\begingroup\$ Would the electromagnetic radiation from the solenoid cause any harm to any of the components or ESP microcontroller? A solenoid is ususally operated with a DC voltage and that means that the circuit will only emit some EM waves when you activate or deactivate the solenoid. When there's a DC voltage across the solenoid it has a static magnetic field around it. EM waves are varying (over time) magnetic (and electric) fields. Just make sure you have a flyback diode in parallel with the solenoid, without it the transistor will be damaged when the solenoid is switched off. \$\endgroup\$ – Bimpelrekkie Oct 11 '20 at 12:57

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.