No clue? You could try glueing little loops of string on each piece, dust them with glitter, and then hang them on your wife's Xmas tree! Ho Ho Ho!
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Several Regions have held meetups already, but others are being planned or are evaluating the interest. The Ontario GTA West area meetup is planned for Saturday April 26th at Greasemonkeys shop in Aylmer Ontario. If you are interested and haven’t signed up yet, click here! Arbutus has also explored interest in a Fraser Valley meetup but it seems members either missed his thread or had other plans. Let him know if you are interested in a meetup later in the year by posting here! Slowpoke is trying to pull together an Ottawa area meetup later this summer. No date has been selected yet, so let him know if you are interested here! We are not aware of any other meetups being planned this year. If you are interested in doing something in your area, let everyone know and make it happen! Meetups are a great way to make new machining friends and get hands on help in your area. Don’t be shy, sign up and come, or plan your own meetup!
Bridgeport Mill Tachometer
- Thread starter Susquatch
- Start date
No clue? You could try glueing little loops of string on each piece, dust them with glitter, and then hang them on your wife's Xmas tree! Ho Ho Ho!
Hey Craig, don't leave us hanging there what is this kit called with item number on Amazon besides terminal? Ho, ho, ho, 5 more sleeps!
Last edited:
Tom O
Ultra Member
Have you tried looking at Solarbotics here in Calgary they are situated around 32Ave and 12St in the north.
www.solarbotics.com
Solarbotics Ltd. - Calgary's Hardware Hacking Resource
www.solarbotics.com
Have you tried looking at Solarbotics here in Calgary they are situated around 32Ave and 12St in the north.
Solarbotics Ltd. - Calgary's Hardware Hacking Resource
Yup... kind of pricey. I got a switch, enclosure and 9V battery holder there.
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still working on my mill controller, ran across a MUCH better tachometer framework. This library uses the main system clock to measure microseconds between pulses, takes maybe ten pulses and averages the time.
(correction - 30 pulses, should have read the code)
In testing it can easily track from1 Hz to 2500 Hz with good accuracy. 60 RPM to 150k RPM with my single trigger per revolution. Is not affected by other code in the loop, which I proved by adding a delay-flash-an-LED-delay after the frequency function, and changing the length of delay has no effect on accuracy.
The library is available in the usual Arduino <Manage Libraries> menu.
Here's my testing code:
#include <FreqMeasure.h>
// pin 8 is input
void setup() {
Serial.begin(57600);
FreqMeasure.begin();
pinMode(LED_BUILTIN, OUTPUT);
pinMode(8, INPUT);
}
double sum=0;
int count=0;
void loop() {
if (FreqMeasure.available()) {
// average several reading together
sum = sum + FreqMeasure.read();
count = count + 1;
if (count > 30) {
float frequency = FreqMeasure.countToFrequency(sum / count);
Serial.println(frequency);
Serial.println(frequency *60); // converted to RPM
sum = 0;
count = 0;
// otherstuff
digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level)
delay(10); // wait a bit
digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW
delay(10); // wait a bit
}
}
}
(correction - 30 pulses, should have read the code)
In testing it can easily track from1 Hz to 2500 Hz with good accuracy. 60 RPM to 150k RPM with my single trigger per revolution. Is not affected by other code in the loop, which I proved by adding a delay-flash-an-LED-delay after the frequency function, and changing the length of delay has no effect on accuracy.
The library is available in the usual Arduino <Manage Libraries> menu.
Here's my testing code:
#include <FreqMeasure.h>
// pin 8 is input
void setup() {
Serial.begin(57600);
FreqMeasure.begin();
pinMode(LED_BUILTIN, OUTPUT);
pinMode(8, INPUT);
}
double sum=0;
int count=0;
void loop() {
if (FreqMeasure.available()) {
// average several reading together
sum = sum + FreqMeasure.read();
count = count + 1;
if (count > 30) {
float frequency = FreqMeasure.countToFrequency(sum / count);
Serial.println(frequency);
Serial.println(frequency *60); // converted to RPM
sum = 0;
count = 0;
// otherstuff
digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level)
delay(10); // wait a bit
digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW
delay(10); // wait a bit
}
}
}
Last edited:
deleted_user
Super User
that is the best method of sampling to achieve fast and accurate rpm returnsstill working on my mill controller, ran across a MUCH better tachometer framework. This library uses the main system clock to measure microseconds between pulses, takes maybe ten pulses and averages the time.
(correction - 30 pulses, should have read the code)
In testing it can easily track from1 Hz to 2500 Hz with good accuracy. 60 RPM to 150k RPM with my single trigger per revolution. Is not affected by other code in the loop, which I proved by adding a delay-flash-an-LED-delay after the frequency function, and changing the length of delay has no effect on accuracy.
The library is available in the usual Arduino <Manage Libraries> menu.
Here's my testing code:
#include <FreqMeasure.h>
// pin 8 is input
void setup() {
Serial.begin(57600);
FreqMeasure.begin();
pinMode(LED_BUILTIN, OUTPUT);
pinMode(8, INPUT);
}
double sum=0;
int count=0;
void loop() {
if (FreqMeasure.available()) {
// average several reading together
sum = sum + FreqMeasure.read();
count = count + 1;
if (count > 30) {
float frequency = FreqMeasure.countToFrequency(sum / count);
Serial.println(frequency);
Serial.println(frequency *60); // converted to RPM
sum = 0;
count = 0;
// otherstuff
digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level)
delay(10); // wait a bit
digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW
delay(10); // wait a bit
}
}
}