Hello,
I'd like to know if there's any way to generate negative 5 volts on any of the Arduino pins. I need -5V for an application and do not have access to the ICs available in the market.
Thanks.
Hi a negativ 5 volts means that the currents goes in the other way so if you invert the orientation of your components won't it be the solution ?
(If you put a Multimeter with the negativ pin on the positiv end of the battery and the positiv on the negativ, you'll get a negativ voltage)
Give more details if this doesn't solve your problem
If you do not have access to standard IC chips do the following:
Use Google and search for: ne555 negative voltage regulator to get the circuit plan.
You can easily replace the NE555 timer with a multivibrator built with transistors.
We all learn the hard way. If you just reverse polarities on electronic devices you will learn the very hard way.
Sorry, however, somtimes it is not that simple .
demokrato:
Hi a negativ 5 volts means that the currents goes in the other way so if you invert the orientation of your components won't it be the solution ?(If you put a Multimeter with the negativ pin on the positiv end of the battery and the positiv on the negativ, you'll get a negativ voltage)
Give more details if this doesn't solve your problem
Thanks for the response, the the issue is that my component isn't a polar one. it is a sensor which boils down to be a varistor.
please use this link to view my circuit Redirect Notice
No, an arduino cannot generate -5 volts (in fact, the arduino will be damaged if you expose the pins to voltages that are below ground). There's no negative voltage on the whole arduino board; you would need to use external components to generate a negative voltage (ex, inverting DC-DC converter, cap switcher, etc)
Everyone hates having to generate negative voltages; we try to avoid things that use them whenever possible. I've seen a lot of projects where they gave up and used a battery to get the negative voltage (ex, 9v battery, + side tied to ground, negative side is -9v, then regulate to -5v with a negative voltage regulator). You don't often have to generate negative voltages nowadays (in the old days, before rail to rail comparators and opamps, it was much more common to need dual supply)
@arduinoaleman : gosh thanks for correcting me, I'm more used to classical electicity than with chips ! would have been a bad idea !
You don't need to use a current-to-voltage converter circuit as recommended, just use a resistor
divider like everyone else does - you can cancel the non-linear response in software if that's an
issue.
Classic xy-problem - you were really asking how to interface a variable resistance sensor
to an Arduino, but you actually said "how do I handle -5V"