sharpie7
Features - components variable resistors, not potentiometers, non-linear variable resistors
I can use pots to simulate variable resistors by tying the ends together, but it would be nice to have a simpler device for variable resistors.
While we're at it, how about things like LDRs, PTC/NTC thermistors? They could be linear approximation or perhaps have inputs for approximate curves. Maybe use B parameter? Some datasheets seem to provide it.
https://en.wikipedia.org/wiki/Thermistor#B_or_.CE.B2_parameter_equation http://reprap.org/wiki/MeasuringThermistorBeta
Or just point entry to approximate a curve. Take 5 - 8 points like these. There might even be some kind of java library for fitting curves to a set of points. http://www.bapihvac.com/wp-content/uploads/2010/11/Thermistor_100K.pdf
Thanks, -Alan
LDRElm.java ID=374
package com.lushprojects.circuitjs1.client;
import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.Command; import com.google.gwt.canvas.dom.client.CanvasGradient; import com.google.gwt.event.dom.client.MouseWheelEvent; import com.google.gwt.event.dom.client.MouseWheelHandler;
/*Bill Collis - June 2015 */
class LDRElm extends CircuitElm implements Command, MouseWheelHandler { double position; //of the slider 0.005 to 0.995 double resistance; //based upon slider position double minLux, maxLux; double lux;
Scrollbar slider;
Label label;
String sliderText;
//constructor - when initially created
public LDRElm(int xx, int yy) {
super(xx, yy);
//setup();
minLux = 0.1; //dark
maxLux = 10000; // sunlight
position = .34;
lux = LuxFromSliderPos();
resistance = calcResistance(lux);
sliderText = "Dark--------------------Bright";
createSlider();
}
//constructor - when read in from file
public LDRElm(int xa, int ya, int xb, int yb, int f,
StringTokenizer st) {
super(xa, ya, xb, yb, f);
minLux = 0.1; //dark
maxLux = 10000; // sunlight
position = new Double(st.nextToken()).doubleValue();
lux = LuxFromSliderPos();
resistance = calcResistance(lux);
sliderText = st.nextToken() ;
while (st.hasMoreTokens())
sliderText += ' ' + st.nextToken();
createSlider(); //uses position to set the slider
}
//void setup() {
//}
int getPostCount() { return 2; }
int getDumpType() { return 374; } //LDR
Point getPost(int n) {
return (n == 0) ? point1 : point2;
}
//data for file saving - make sure it matches order of items in file input constructor
String dump() {
return super.dump() + " " + position + " " + sliderText;
}
void createSlider() {
sim.addWidgetToVerticalPanel(label = new Label(sliderText));
label.addStyleName("topSpace");
int value = (int) (position*100);
sim.addWidgetToVerticalPanel(slider = new Scrollbar(Scrollbar.HORIZONTAL, value, 1, 0, 101, this, this));
}
public void execute() {
sim.analyzeFlag = true;
setPoints();
}
void delete() {
sim.removeWidgetFromVerticalPanel(label);
sim.removeWidgetFromVerticalPanel(slider);
}
Point ps3, ps4;
//called straight after constructor when txt file is loaded
void setPoints() {
super.setPoints();
calcLeads(32);
position = slider.getValue()*.0099+.0001;
lux = LuxFromSliderPos();
resistance = calcResistance(lux);
ps3 = new Point();
ps4 = new Point();
}
Polygon arrowPoly;
void draw(Graphics g) { //used Resistor draw
//int segments = 16;
int i;
//int ox = 0;
int hs=6; //width
double v1 = volts[0];
double v2 = volts[1];
setBbox(point1, point2, hs); //the two points that are there when the device is being created
draw2Leads(g); //from point1 to lead1 and lead1 to point2 (lead1&2 are on the body)
setPowerColor(g, true);
double len = distance(lead1, lead2);
g.context.save();
g.context.setLineWidth(3.0);
g.context.setTransform(((double)(lead2.x-lead1.x))/len, ((double)(lead2.y-lead1.y))/len, -((double)(lead2.y-lead1.y))/len,((double)(lead2.x-lead1.x))/len,lead1.x,lead1.y);
CanvasGradient grad = g.context.createLinearGradient(0,0,len,0);
grad.addColorStop(0, getVoltageColor(g,v1).getHexValue());
grad.addColorStop(1.0, getVoltageColor(g,v2).getHexValue());
g.context.setStrokeStyle(grad);
if (!sim.euroResistorCheckItem.getState()) {
g.context.beginPath();
g.context.moveTo(0,0);
for (i=0;i<4;i++){
g.context.lineTo((1+4*i)*len/16, hs);
g.context.lineTo((3+4*i)*len/16, -hs);
}
g.context.lineTo(len, 0);
g.context.stroke();
} else {
g.context.strokeRect(0, -hs, len, 2.0*hs); //draw the box for the euro resistor
}
g.context.beginPath(); //thermistor symbol lines 0 is in the middle of the left handside of the resistor box
//upper arrow
g.context.moveTo(-8,26); //arrow1 start (y,x coordinates from center?)
g.context.lineTo(8,12); //arrow end point
g.context.moveTo(2,12); //arrow 1 head
g.context.lineTo(8,12); //arrow end point
g.context.lineTo(8,18);
g.context.moveTo(12,26); //arrow2 start (y,x coordinates from center?)
g.context.lineTo(26,12); //arrow end point
g.context.moveTo(20,12); //arrow 1 head
g.context.lineTo(26,12); //arrow end point
g.context.lineTo(26,18);
g.context.stroke();
g.context.restore();
if (sim.showValuesCheckItem.getState()) {
lux = LuxFromSliderPos();
resistance = calcResistance(lux);
String s = getShortUnitText(resistance, "");
drawValues(g, s+"\u03A9", hs);
}
doDots(g);
drawPosts(g);
}
void calculateCurrent() {
current = (volts[0]-volts[1])/resistance;
}
void stamp() {
lux = LuxFromSliderPos();
resistance = calcResistance(lux);
sim.stampResistor(nodes[0], nodes[1], resistance);
}
void getInfo(String arr[]) {
arr[0] = "LDR";
arr[1] = "I = "+ getCurrentDText(current); //getBasicInfo(arr);
arr[2] = "Vd = "+ getVoltageDText(getVoltageDiff());
arr[3] = "R = " + getUnitText(resistance, sim.ohmString);
arr[4] = "P = " + getUnitText(getPower(), "W");
}
public EditInfo getEditInfo(int n) {
if (n == 0) {
EditInfo ei = new EditInfo("Slider Text", 0, -1, -1);
ei.text = sliderText;
return ei;
}
return null;
}
//component edited
public void setEditValue(int n, EditInfo ei) {
if (n == 0) {
sliderText = ei.textf.getText();
label.setText(sliderText);
sim.setiFrameHeight();
}
lux = LuxFromSliderPos();
resistance = calcResistance(lux);
}
void setMouseElm(boolean v) {
super.setMouseElm(v);
if (slider!=null)
slider.draw();
}
public void onMouseWheel(MouseWheelEvent e) {
if (slider!=null)
slider.onMouseWheel(e);
}
double calcResistance(double lux) //knowing the lux
{
//double loglux = Math.log10(lux);
//double slope = -1.4;
//double intercept = 7.1;
//double logR = (loglux-intercept)/slope;
//return Math.round(Math.pow(10, logR));
double r = (maxLux-lux+1)*10;
r = Math.round(r);
return r;
}
double LuxFromSliderPos() //knowing slider position etc
{
return maxLux * position + minLux ;
}
}
ThernistorElm.java ID=350
package com.lushprojects.circuitjs1.client;
import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.Command; import com.google.gwt.canvas.dom.client.CanvasGradient; import com.google.gwt.event.dom.client.MouseWheelEvent; import com.google.gwt.event.dom.client.MouseWheelHandler;
/*Bill Collis - June 2015
- datasheet for Vishay thermistor ntcle100
- thermistor model
- view-source:http://www.giangrandi.ch/electronics/ntc/ntc.shtml
- http://www.giangrandi.ch/electronics/ntc/ntcparam.html
- no heating effects
- ID = 350
- add id to CirSim.constructElement and part to CirSim.createCe and to CirSimcomposeMainMenu */
class ThermistorNTCElm extends CircuitElm implements Command, MouseWheelHandler { double position; //of the slider 0.005 to 0.995 double resistance; //based upon slider position double minTempr, maxTempr; //Celsius - note min is -40, max is +150 degC double temperature; //calculated from slider value (0.005 - 0.995) ratios of minTempr - maxTempr double r25, r50; //the values that a user can input from a datsheet r 225 degc and r at 50degC double rneg40; //maximum resistance - will be at -40 degC double b25100; // constant based upon 2 values of R for 2 temperatures double t0 = 273.15; double t25 = t0 + 25;
Scrollbar slider; //from Pot
Label label;
String sliderText;
//constructor - when initially created
public ThermistorNTCElm(int xx, int yy) {
super(xx, yy);
//setup();
minTempr = -40;//celsius
maxTempr = 150;
r25 = 10000; //default 10k thermistor e.g. NTCLE100E3010 Vishay
r50 = 3605;
position = .34; //25 degC for -40 to 150 degC
//thermistor calcs
rneg40 = calcResistance(minTempr); //for 10k ntc about 400k
b25100 = calcB25100(); //
temperature = temprFromSliderPos();
resistance = calcResistance(temperature);
sliderText = "Temperature -40 150 C";
createSlider();
}
//constructor - when read in from file
public ThermistorNTCElm(int xa, int ya, int xb, int yb, int f,
StringTokenizer st) {
super(xa, ya, xb, yb, f);
r25 = new Double(st.nextToken()).doubleValue();
r50 = new Double(st.nextToken()).doubleValue();
minTempr = new Double(st.nextToken()).doubleValue();
maxTempr = new Double(st.nextToken()).doubleValue();
position = new Double(st.nextToken()).doubleValue();
//thermistor calcs
rneg40 = calcResistance(minTempr); //for 10k ntc about 400k
b25100 = calcB25100(); //
temperature = temprFromSliderPos();
resistance = calcResistance(temperature);
sliderText = st.nextToken() ;
while (st.hasMoreTokens())
sliderText += ' ' + st.nextToken();
createSlider(); //uses position to set the slider
}
//void setup() {
//}
int getPostCount() { return 2; }
int getDumpType() { return 350; } //NTC thermistor
Point getPost(int n) {
return (n == 0) ? point1 : point2;
}
//data for file saving - make sure it matches order of items in file input constructor
String dump() {
return super.dump() + " " + r25 + " " + r50 + " " + minTempr + " " + maxTempr +" " + position + " " + sliderText;
}
void createSlider() {
sim.addWidgetToVerticalPanel(label = new Label(sliderText));
label.addStyleName("topSpace");
int value = (int) (position*100);
sim.addWidgetToVerticalPanel(slider = new Scrollbar(Scrollbar.HORIZONTAL, value, 1, 0, 101, this, this));
}
public void execute() {
sim.analyzeFlag = true;
setPoints();
}
void delete() {
sim.removeWidgetFromVerticalPanel(label);
sim.removeWidgetFromVerticalPanel(slider);
}
Point ps3, ps4;
//called straight after constructor when txt file is loaded
void setPoints() {
super.setPoints();
calcLeads(32);
position = slider.getValue()*.0099+.005;
temperature = temprFromSliderPos();
resistance = calcResistance(temperature);
ps3 = new Point();
ps4 = new Point();
}
void draw(Graphics g) { //used Resistor draw
//int segments = 16;
int i;
//int ox = 0;
int hs=6; //is this a width
double v1 = volts[0];
double v2 = volts[1];
setBbox(point1, point2, hs); //the two points that are there when the device is being created
draw2Leads(g); //from point1 to lead1 and lead1 to point2 (lead1&2 are on the body)
setPowerColor(g, true);
double len = distance(lead1, lead2);
g.context.save();
g.context.setLineWidth(3.0);
g.context.setTransform(((double)(lead2.x-lead1.x))/len, ((double)(lead2.y-lead1.y))/len, -((double)(lead2.y-lead1.y))/len,((double)(lead2.x-lead1.x))/len,lead1.x,lead1.y);
CanvasGradient grad = g.context.createLinearGradient(0,0,len,0);
grad.addColorStop(0, getVoltageColor(g,v1).getHexValue());
grad.addColorStop(1.0, getVoltageColor(g,v2).getHexValue());
g.context.setStrokeStyle(grad);
if (!sim.euroResistorCheckItem.getState()) {
g.context.beginPath();
g.context.moveTo(0,0);
for (i=0;i<4;i++){
g.context.lineTo((1+4*i)*len/16, hs);
g.context.lineTo((3+4*i)*len/16, -hs);
}
g.context.lineTo(len, 0);
g.context.stroke();
} else {
g.context.strokeRect(0, -hs, len, 2.0*hs); //draw the box for the euro resistor
}
g.context.beginPath(); //thermistor symbol lines 0 is in the middle of the left handside of the resistor box
g.context.moveTo(0-hs,hs*2);
g.context.lineTo(hs,hs*2);
g.context.lineTo(len,-hs*2);
g.context.stroke();
g.context.restore();
if (sim.showValuesCheckItem.getState()) {
temperature = temprFromSliderPos();
resistance = calcResistance(temperature);
String s = getShortUnitText(resistance, "");
String t = Character.toString((char)176);
//drawValues(g, "-t:"+s, hs);
drawValues(g, temperature+t+"C="+s+"\u03A9", hs);
}
doDots(g);
drawPosts(g);
}
void calculateCurrent() {
current = (volts[0]-volts[1])/resistance;
}
void stamp() {
temperature = temprFromSliderPos(); //e.g. 190 - 40 for range -40 to +150
resistance = calcResistance(temperature);
sim.stampResistor(nodes[0], nodes[1], resistance); //show temperature as well??
}
void getInfo(String arr[]) {
arr[0] = "thermistor";
arr[1] = "I = "+ getCurrentDText(current); //getBasicInfo(arr);
arr[2] = "Vd = "+ getVoltageDText(getVoltageDiff());
arr[3] = "R = " + getUnitText(resistance, sim.ohmString);
arr[4] = "P = " + getUnitText(getPower(), "W");
arr[5] = "Tempr = " + getUnitText(temperature, "degC");
}
public EditInfo getEditInfo(int n) {
// ohmString doesn't work here on linux
if (n == 0)
return new EditInfo("R at 25 degC", r25, r50+100, 100000); //limits: r25 must be > r50
if (n == 1)
return new EditInfo("R at 50 degC", r50, 100, r25-100);
if (n == 2)
return new EditInfo("Slider min tempr(degC)", minTempr, -40, maxTempr); //limits: maxTempr must be > minTempr
if (n == 3)
return new EditInfo("Slider max tempr(degC)", maxTempr, minTempr, 150);
if (n == 4) {
EditInfo ei = new EditInfo("Slider Text", 0, -1, -1);
ei.text = sliderText;
return ei;
}
return null;
}
//component edited
public void setEditValue(int n, EditInfo ei) {
if (n == 0)
r25 = ei.value;
if (n == 1)
r50 = ei.value;
if (n == 2)
minTempr = ei.value;
if (n == 3)
maxTempr = ei.value;
if (n == 4) {
sliderText = ei.textf.getText();
label.setText(sliderText);
sim.setiFrameHeight();
}
rneg40 = calcResistance(minTempr);
b25100 = calcB25100(); //
temperature = temprFromSliderPos();
resistance = calcResistance(temperature);
}
void setMouseElm(boolean v) {
super.setMouseElm(v);
if (slider!=null)
slider.draw();
}
public void onMouseWheel(MouseWheelEvent e) {
if (slider!=null)
slider.onMouseWheel(e);
}
double calcResistance(double tempr) //knowing the temperature
{
return Math.round(r25 * Math.exp(b25100 * ((1 / (tempr + t0)) - (1 / t25))));
}
double temprFromSliderPos() //knowing slider position etc
{
return Math.round( position * (maxTempr - minTempr) + minTempr);
}
//determine constant B25100 - when knowing two R values at two temperatures
double calcB25100() //given R25=10000 and R50=3605 B25100 will be 3932
{
double kelvin1 = t0 + 25;
double kelvin2 = t0 + 50;
return ( Math.log(r25) - Math.log(r50) ) / ( (1/kelvin1) - (1/kelvin2) );
}
}
I have pulled these two from the ones I have built and am testing. They are free to be added to Iain and Pauls work, They do need Iain and Paul's copyright info put back into them and testing as I have stripped off some extra features I have in the version of the simulator I am working on
Thankyou Paul for the very useful simulator and thankyou Bill for the additions. Do you think it would be possible to create a Varistor aswell?
Regards, Pierre
Ok I finally took a look at these and am incorporating them now. Thanks Bill!
How about adding optional heating effects to the thermistor? I'd suggest starting with the lamp model for that, and allow both PTC and NTC forms by simply allowing the TC to be positive or negative.
Ok the main request here is done but someone needs to go through all the comments and make separate issues for all the additional requests. 🙂