Coucou,
si vous avez besoin de mesurer un signal (en courant continu et <5V) et que vous avez un combo "RAMPS Arduino et grand ecran LCD"
Vous avez ce qu'il faut
Vous devez retirer les pololus, les cavaliers, les différentes sonde et les endstop (le plus simple est d'avoir une Ramps + Arduino d'avance :p )
Ensuite, on ouvre un nouveau projet Arduino, et on colle le code suivant:
#include "U8glib.h"
#include <EEPROM.h>
// Variables you might want to play with
byte useThreshold = 1; // 0 = Off, 1 = Rising, 2 = Falling
byte theThreshold = 128; // 0-255, Multiplied by voltageConst
unsigned int timePeriod = 200; // 0-65535, us or ms per measurement (max 0.065s or 65.535s)
byte voltageRange = 1; // 1 = 0-3.3V, 2 = 0-1.65V, 3 = 0-0.825V
byte ledBacklight = 100;
boolean autoHScale = true; // Automatic horizontal (time) scaling
boolean linesNotDots = true; // Draw lines between data points
// Variables that can probably be left alone
const byte vTextShift = 3; // Vertical text shift (to vertically align info)
const byte numOfSamples = 100; // Leave at 100 for 128x64 pixel display
unsigned int HQadcReadings[numOfSamples];
byte adcReadings[numOfSamples];
byte thresLocation = 0; // Threshold bar location
float voltageConst = 0.052381; // Scaling factor for converting 0-63 to V
float avgV = 0.0;
float maxV = 0.0;
float minV = 0.0;
float ptopV = 0.0;
float theFreq = 0;
const byte theAnalogPin = A0; // Data read pin
const byte lcdLED = 6; // LED Backlight
const byte lcdA0 = A0; // pin "X Stepper" on RAMPS for A0 (probe)
const byte lcdRESET = 8; // Low reset /
const byte lcdCS = 9; // SPI Chip Select (internally pulled up), active low /overide for RAMPS
const byte lcdMOSI = 11; // SPI Data transmission /overide for RAMPS
const byte lcdSCK = 13; // SPI Serial Clock /overide for RAMPS
// SW SPI:
//U8GLIB_MINI12864_2X u8g(lcdSCK, lcdMOSI, lcdCS, lcdA0, lcdRESET);
// HW SPI:
U8GLIB_ST7920_128X64_4X u8g(23, 17, 16); // Replace for RAMPS, original values: SCK =13, MOSI = 11, CS = 11
// High speed ADC code
// From: http://forum.arduino.cc/index.php?PHPSESSID=e21f9a71b887039092c91a516f9b0f36&topic=6549.15
#define FASTADC 1
// defines for setting and clearing register bits
#ifndef cbi
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#endif
#ifndef sbi
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#endif
void collectData(void) {
unsigned int tempThres = 0;
unsigned int i = 0;
if (autoHScale == true) {
// With automatic horizontal (time) scaling enabled,
// scale quickly if the threshold location is far, then slow down
if (thresLocation > 5*numOfSamples/8) {
timePeriod = timePeriod + 10;
} else if (thresLocation < 3*numOfSamples/8) {
timePeriod = timePeriod - 10;
} else if (thresLocation > numOfSamples/2) {
timePeriod = timePeriod + 2;
} else if (thresLocation < numOfSamples/2) {
timePeriod = timePeriod - 2;
}
}
// Enforce minimum time periods
if (timePeriod < 35) {
timePeriod = 35;
}
// Adjust voltage constant to fit the voltage range
if (voltageRange == 1) {
// voltageConst = 0.0523810; // 0-3.30V
voltageConst = 0.1024; // 0-5V
} else if (voltageRange == 2) {
voltageConst = 0.0261905; // 0-1.65V
} else if (voltageRange == 3) {
voltageConst = 0.0130952; //0-0.825V
}
// If using threshold, wait until it has been reached
if (voltageRange == 1) tempThres = theThreshold << 2;
else if (voltageRange == 2) tempThres = theThreshold << 1;
else if (voltageRange == 3) tempThres = theThreshold;
if (useThreshold == 1) {
i = 0; while ((analogRead(theAnalogPin)>tempThres) && (i<32768)) i++;
i = 0; while ((analogRead(theAnalogPin)<tempThres) && (i<32768)) i++;
}
else if (useThreshold == 2) {
i = 0; while ((analogRead(theAnalogPin)<tempThres) && (i<32768)) i++;
i = 0; while ((analogRead(theAnalogPin)>tempThres) && (i<32768)) i++;
}
// Collect ADC readings
for (i=0; i<numOfSamples; i++) {
// Takes 35 us with high speed ADC setting
HQadcReadings[i] = analogRead(theAnalogPin);
if (timePeriod > 35)
delayMicroseconds(timePeriod-35);
}
for (i=0; i<numOfSamples; i++) {
// Scale the readings to 0-63 and clip to 63 if they are out of range.
if (voltageRange == 1) {
if (HQadcReadings[i]>>4 < 0b111111) adcReadings[i] = HQadcReadings[i]>>4 & 0b111111;
else adcReadings[i] = 0b111111;
} else if (voltageRange == 2) {
if (HQadcReadings[i]>>3 < 0b111111) adcReadings[i] = HQadcReadings[i]>>3 & 0b111111;
else adcReadings[i] = 0b111111;
} else if (voltageRange == 3) {
if (HQadcReadings[i]>>2 < 0b111111) adcReadings[i] = HQadcReadings[i]>>2 & 0b111111;
else adcReadings[i] = 0b111111;
}
// Invert for display
adcReadings[i] = 63-adcReadings[i];
}
// Calculate and display frequency of signal using zero crossing
if (useThreshold != 0) {
if (useThreshold == 1) {
thresLocation = 1;
while ((adcReadings[thresLocation]<(63-(theThreshold>>2))) && (thresLocation<numOfSamples-1)) (thresLocation++);
thresLocation++;
while ((adcReadings[thresLocation]>(63-(theThreshold>>2))) && (thresLocation<numOfSamples-1)) (thresLocation++);
}
else if (useThreshold == 2) {
thresLocation = 1;
while ((adcReadings[thresLocation]>(63-(theThreshold>>2))) && (thresLocation<numOfSamples-1)) (thresLocation++);
thresLocation++;
while ((adcReadings[thresLocation]<(63-(theThreshold>>2))) && (thresLocation<numOfSamples-1)) (thresLocation++);
}
theFreq = (float) 1000/(thresLocation * timePeriod) * 1000;
}
// Average Voltage
avgV = 0;
for (i=0; i<numOfSamples; i++)
avgV = avgV + adcReadings[i];
avgV = (63-(avgV / numOfSamples)) * voltageConst;
// Maximum Voltage
maxV = 63;
for (i=0; i<numOfSamples; i++)
if (adcReadings[i]<maxV) maxV = adcReadings[i];
maxV = (63-maxV) * voltageConst;
// Minimum Voltage
minV = 0;
for (i=0; i<numOfSamples; i++)
if (adcReadings[i]>minV) minV = adcReadings[i];
minV = (63-minV) * voltageConst;
// Peak-to-Peak Voltage
ptopV = maxV - minV;
}
void handleSerial(void) {
char inByte;
char dataByte;
boolean exitLoop = false;
do {
// Clear out buffer
do {
inByte = Serial.read();
} while (Serial.available() > 0);
Serial.print("\nArduino LCD Oscilloscope\n");
Serial.print(" 1 - Change threshold usage (currently: ");
if (useThreshold == 0) Serial.print("Off)\n");
else if (useThreshold == 1) Serial.print("Rise)\n");
else if (useThreshold == 2) Serial.print("Fall)\n");
Serial.print(" 2 - Change threshold value (currently: ");
Serial.print(theThreshold, DEC); Serial.print(")\n");
Serial.print(" 3 - Change sampling period (currently: ");
Serial.print(timePeriod, DEC); Serial.print(")\n");
Serial.print(" 4 - Change voltage range (currently: ");
if (voltageRange == 1) Serial.print("0-3.3V)\n");
else if (voltageRange == 2) Serial.print("0-1.65V)\n");
else if (voltageRange == 3) Serial.print("0-0.825V)\n");
Serial.print(" 5 - Toggle auto horizontal (time) scaling (currently: ");
if (autoHScale == true) Serial.print("On)\n");
else if (autoHScale == false) Serial.print("Off)\n");
Serial.print(" 6 - Toggle line/dot display (currently: ");
if (linesNotDots == true) Serial.print("Lines)\n");
else if (linesNotDots == false) Serial.print("Dots)\n");
Serial.print(" 8 - Exit\n");
// Wait for input/response, refresh display while in menu
do {
collectData();
// Picture Display Loop
u8g.firstPage();
do { draw(); } while( u8g.nextPage() );
} while (Serial.available() == 0);
inByte = Serial.read();
if (inByte == '1') {
Serial.print("Change threshold usage\n");
Serial.print(" 0 - Off\n");
Serial.print(" 1 - Rise\n");
Serial.print(" 2 - Fall\n");
do { } while (Serial.available() == 0);
dataByte = Serial.read();
if (dataByte == '0') useThreshold = 0;
else if (dataByte == '1') useThreshold = 1;
else if (dataByte == '2') useThreshold = 2;
} else if (inByte == '2') {
Serial.print("Change threshold value (thresholds for 0-3.3V,0-1.65V,0-0.825V ranges)\n");
Serial.print(" 0 - 32 (0.41V, 0.21V, 0.10V)\n");
Serial.print(" 1 - 80 (1.04V, 0.52V, 0.26V)\n");
Serial.print(" 2 - 128 (1.66V, 0.83V, 0.41V)\n");
Serial.print(" 3 - 176 (2.28V, 1.14V, 0.57V)\n");
Serial.print(" 4 - 224 (2.90V, 1.45V, 0.72V)\n");
do { } while (Serial.available() == 0);
dataByte = Serial.read();
if (dataByte == '0') theThreshold = 32;
else if (dataByte == '1') theThreshold = 80;
else if (dataByte == '2') theThreshold = 128;
else if (dataByte == '3') theThreshold = 176;
else if (dataByte == '4') theThreshold = 224;
} else if (inByte == '3') {
Serial.print("Change sampling frequency\n");
Serial.print(" 0 - 28 kHz (35 us/sample)\n");
Serial.print(" 1 - 20 kHz (50 us/sample)\n");
Serial.print(" 2 - 10 kHz (100 us/sample)\n");
Serial.print(" 3 - 5 kHz (200 us/sample)\n");
Serial.print(" 4 - 2.5 kHz (400 us/sample)\n");
do { } while (Serial.available() == 0);
dataByte = Serial.read();
if (dataByte == '0') timePeriod = 35;
else if (dataByte == '1') timePeriod = 50;
else if (dataByte == '2') timePeriod = 100;
else if (dataByte == '3') timePeriod = 200;
else if (dataByte == '4') timePeriod = 400;
} else if (inByte == '4') {
Serial.print("Change voltage range\n");
Serial.print(" 1 - 0-3.3V\n");
Serial.print(" 2 - 0-1.65V\n");
Serial.print(" 3 - 0-0.825V\n");
do { } while (Serial.available() == 0);
dataByte = Serial.read();
if (dataByte == '1') voltageRange = 1;
else if (dataByte == '2') voltageRange = 2;
else if (dataByte == '3') voltageRange = 3;
} else if (inByte == '5') {
Serial.print("Toggle auto horizontal (time) scaling\n");
Serial.print(" 0 - Off\n");
Serial.print(" 1 - On\n");
do { } while (Serial.available() == 0);
dataByte = Serial.read();
if (dataByte == '0') autoHScale = false;
else if (dataByte == '1') autoHScale = true;
} else if (inByte == '6') {
Serial.print("Toggle line/dot display\n");
Serial.print(" 0 - Lines\n");
Serial.print(" 1 - Dots\n");
do { } while (Serial.available() == 0);
dataByte = Serial.read();
if (dataByte == '0') linesNotDots = true;
else if (dataByte == '1') linesNotDots = false;
} else if (inByte == '8') {
Serial.print("Bye!\n");
exitLoop = true;
}
} while (exitLoop == false);
}
void draw(void) {
int i;
char buffer[16];
u8g.setFont(u8g_font_micro);
// Draw static text
u8g.drawStr(0, 5+vTextShift, "Av");
u8g.drawStr(0, 11+vTextShift, "Mx");
u8g.drawStr(0, 17+vTextShift, "Mn");
u8g.drawStr(0, 23+vTextShift, "PP");
u8g.drawStr(0, 29+vTextShift, "Th");
u8g.drawStr(24, 35+vTextShift, "V");
u8g.drawStr(0, 41+vTextShift, "Tm");
u8g.drawStr(4, 47+vTextShift, "ms/div");
u8g.drawStr(20, 53+vTextShift, "Hz");
u8g.drawStr(0, 59+vTextShift, "R");
// Draw dynamic text
if (autoHScale == true) u8g.drawStr(124, 5, "A");
dtostrf(avgV, 3, 2, buffer);
u8g.drawStr(12, 5+vTextShift, buffer);
dtostrf(maxV, 3, 2, buffer);
u8g.drawStr(12, 11+vTextShift, buffer);
dtostrf(minV, 3, 2, buffer);
u8g.drawStr(12, 17+vTextShift, buffer);
dtostrf(ptopV, 3, 2, buffer);
u8g.drawStr(12, 23+vTextShift, buffer);
dtostrf(theFreq, 5, 0, buffer);
u8g.drawStr(0, 53+vTextShift, buffer);
if (useThreshold == 0) {
u8g.drawStr(12, 29+vTextShift, "Off");
} else if (useThreshold == 1) {
u8g.drawStr(12, 29+vTextShift, "Rise");
dtostrf((float) (theThreshold>>2) * voltageConst, 3, 2, buffer);
} else if (useThreshold == 2) {
u8g.drawStr(12, 29+vTextShift, "Fall");
dtostrf((float) (theThreshold>>2) * voltageConst, 3, 2, buffer);
}
u8g.drawStr(8, 35+vTextShift, buffer);
// Correctly format the text so that there are always 4 characters
if (timePeriod < 400) {
dtostrf((float) timePeriod/1000 * 25, 3, 2, buffer);
} else if (timePeriod < 4000) {
dtostrf((float) timePeriod/1000 * 25, 3, 1, buffer);
} else if (timePeriod < 40000) {
dtostrf((float) timePeriod/1000 * 25, 3, 0, buffer);
} else { // Out of range
dtostrf((float) 0.00, 3, 2, buffer);
}
u8g.drawStr(12, 41+vTextShift, buffer);
if (voltageRange == 1) {
u8g.drawStr(4, 59+vTextShift, "0-3.30");
} else if (voltageRange == 2) {
u8g.drawStr(4, 59+vTextShift, "0-1.65");
} else if (voltageRange == 3) {
u8g.drawStr(4, 59+vTextShift, "0-0.83");
}
// Display graph lines
u8g.drawLine((128-numOfSamples),0,(128-numOfSamples),63);
if (useThreshold != 0)
for (i=29; i<127; i+=3)
u8g.drawPixel(i,63-(theThreshold>>2));
for (i=0; i<63; i+=5) {
u8g.drawPixel(53,i);
u8g.drawPixel(78,i);
u8g.drawPixel(103,i);
u8g.drawPixel(127,i);
}
// Threshold bar
for (i=0; i<63; i+=3)
u8g.drawPixel(thresLocation+(128-numOfSamples),i);
// Draw ADC readings
if (linesNotDots == true) {
for (i=1; i<numOfSamples; i++) // Draw using lines
u8g.drawLine(i+(128-numOfSamples)-1,adcReadings[i-1],i+(128-numOfSamples),adcReadings[i]);
} else {
for (i=2; i<numOfSamples; i++) // Draw using points
u8g.drawPixel(i+(128-numOfSamples),adcReadings[i]);
}
}
void setup() {
u8g.begin();
Serial.begin(9600);
// Turn on LED backlight
analogWrite(lcdLED, ledBacklight);
#if FASTADC
// set prescale to 16
sbi(ADCSRA,ADPS2) ;
cbi(ADCSRA,ADPS1) ;
cbi(ADCSRA,ADPS0) ;
#endif
delay(100);
}
void loop() {
collectData();
// Picture Display Loop
u8g.firstPage();
do { draw(); } while( u8g.nextPage() );
// If user sends any serial data, show menu
if (Serial.available() > 0) {
handleSerial();
}
// rebuild the picture after some delay
delay(100);
}
On importe la bibliothèque "
U8glib.h"
On compile et on téléverse.
Et hop:
Et pour le branchement des sondes:
Je n'ai rien inventé / codé, j'ai juste adapté ce code trouvé sur le net:
http://www.semifluid.com/2013/05/28/arduino-fio-lcd-oscilloscope/ATTENTION: Ne pas inverser le GND et le + (destruction possible de l'Arduino)ATTENTION: Ne pas dépasser 5V sur la borne A0 ( le +) (destruction possible de l'Arduino)voir PONT DIVISEUR DE TENSION pour des tensions supérieurs Have fun
Voir les contributions
(no sé ....)