Super simple Arduino Frequency Counter

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Please watch: "Diodes: The basic building block of all digital circuits"
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[YouAllKnowBob]

Nice simple, but useful little project! Thanks! I built it on a full size breadboard with a breadboard power supply and built a 555 a stable oscillator on the other end. Fun to experiment with capacitor and resistor values and see the instant results.

[emiliomartineziii]

Amazing Video! This helped a ton at work!

[clarkeastman]

I kept working from your orignal project and it does measure AC sine wave without issue. Question was how to get from 120VAC to 10VAC. I purchased a standard door chime transformer (U.S.) that drops 120VAC to 24VAC/16VAC/8VAC for $14.00 at Home Depot and added (2) 1/4W 20K resistors to both the plus and minus connections to keep the current draw down - presto measures 60Hz. My problem solved. Thanks for posting your early efforts, It helped me solve my issues for my project.

[JernD]

I made a USB current/voltage meter by using the same OLED+Nano and a shunt resistor. The arduino has an internal voltage reference, which I used to scale the analogRead voltage.

[monizpaul]

Hall effect sensor with a 4 or 2 magnet collar to measure shaft rotation speed.

[danaknight]

Big problem, you fed it a signal from function generator that was not offset to meet input range of a pin, 0 - 5. Your input swings below ground. Thats a great way of burning out chip. You need to add an R divider to bias up input, Vdd >> R >> pin >> R >> ground. Then capacitor couple input signal to the pin. The Rs around 1K or less. In your example with 50 ohm generator, you swung -2.5 V across pin, thats about 50 mA you drove into pin. Not a good idea.

[junkLAVENDER]

this only work for square wave signal. it really is piece of cake. thank you so much.

[MisterChaos]

Thanks to you i found a use for one of my arduinos. I made slight changes so i could use it on a 16x2 lcd screen and hocked that baby up to my adjustable computer clock. Now i can finally exactly see on which frequency im running

[jimmym]

What’s I have been looking for. 💡 Converting stepper pulse signal from a CNC into a value to map to a pwm output gear motor control. I believe it will work for my application. Thanks brother💕 you are awesome

[josephtannenbaum]

This is great. I did it with s bare bones arduino on a circuit card with a breadboard buddy PS and put it in a plastic box 3.75" by 2.25". Checked with my oscilloscope, it is indeed acurate.

[opalprestonshirley]

Always amazed at the Arduinos capabilities.

[georgechambers]

Nice little project! Useful too. Keep 'em coming...

[planker]

Like Thanks, I'm going to give it a go. I'm also going to jam it in a Tiny85 and see what happens.

[Moonbrony]

Nice! I'd add an input buffer/amplifier and voltmeter then it would make a great display for a homebuilt function generator, showing the frequency and amplitude.

[xyzzyx]

Cool. I'm gonna use it in my water flow meter project.

[MaxSMoke]

I'll have to try this in my portable Arduino box. Since I switched up to the ESP chips for my EMF detector v2, it's been neglected! Exact same hardware in a 3d printed small handheld using a fat 18650 battery.

[lone-eltemplodeltalento]

Very nice project! Can this be done with radiofrequency too? I mean, make something like a fequency counter to measure the working freq. Of a garaje door key for example? Thanks!

[JerryEricsson]

Carry on! Love that series of movies, I have the most of them in my collection, and not a night has gone by since I have received them that I have not watched at least one of them. Last night's movie' Carry On Regardless!

[ChristinaLaRagina]

Can this be run with a microphone input (digital or Analog) for the Frequency Capture source and what would the code changes be to make that work?

[SciStrike]

This is great! I'm going to tweak it to run on the Sparkfun Microview!