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!
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!
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Have you tried looking at Solarbotics here in Calgary they are situated around 32Ave and 12St in the north.
www.solarbotics.com
Homepage
Solarbotics produces unique DIY electronic products and kit and now with the Active-Tech Calgary store, also offers a full line of electronic parts and tools.
www.solarbotics.com
Have you tried looking at Solarbotics here in Calgary they are situated around 32Ave and 12St in the north.
Homepage
Solarbotics produces unique DIY electronic products and kit and now with the Active-Tech Calgary store, also offers a full line of electronic parts and tools.
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
}
}
}