Pkj：/* Debugging */

2014-06-06T08:54:14Z

‎Debugging

Pkj：Created page with "{| style="width: 800px;" |- | ==Objective== The course will show you how to simulate a multimeter with Microduino. The reading of the “multimeter” will be displayed on Pr..."

2014-06-06T08:14:17Z

Created page with "{| style="width: 800px;" |- | ==Objective== The course will show you how to simulate a multimeter with Microduino. The reading of the “multimeter” will be displayed on Pr..."

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{| style="width: 800px;"
|-
|
==Objective==

The course will show you how to simulate a multimeter with Microduino. The reading of the “multimeter” will be displayed on Processing.

==Equipment==
*'''[[Microduino-Core]]'''
*'''[[Microduino-FT232R]]'''

*Other Equipment
**A USB cable
**A bread board
**A resistor of 1M Ω
**A resistor of 100K Ω
**A box of jumpers

==Schematic Diagram==

[[File:AnalogVoltmeterConnectionDiagram.jpg|600px|center|thumb]]

The schematic diagram adopts A2 pin. There are four channels totally, corresponding to the pins of A0, A1, A2, A3 respectively. The voltage reading will be displayed in Channel One.

==Program==

Referring to AnalogVoltmeter

AnalogVoltmeterProcessing

==Debugging==

Step 1：Building the schematic diagram according to hardware environment, as follows:
[[File:AnalogVoltmeterConnection.jpg|600px|center|thumb]]

Step 2：Here is the code we need:

The code of the two ends (Processing and Microduino)
Microduino:

//The voltage value will be received by Processing via serial port output
void loop()
{
// take a number of analog samples and add them up
while (sample_count < NUM_SAMPLES) {
// sample each channel A2 to A5
for (l_cnt = 0; l_cnt < 4; l_cnt++) {
sum[l_cnt] += analogRead(A2 + l_cnt);
}
sample_count++;
delay(10);
}
// calculate the voltage for each channel
for (l_cnt = 0; l_cnt < 4; l_cnt++) {
voltage[l_cnt] = ((float)sum[l_cnt] / (float)NUM_SAMPLES * V_REF) / 1024.0;
}

// each voltage is multiplied by the resistor network
// division factor to calculate the actual voltage
voltage[0] = voltage[0] * DIV_1;
voltage[1] = voltage[1] * DIV_2;
voltage[2] = voltage[2] * DIV_3;
voltage[3] = voltage[3] * DIV_4;

// send voltages to Processing application via serial port / USB
// voltage 1 - A (pin A2)
Serial.print("A ");
Serial.print(voltage[0], 1);
Serial.print("V ");
// voltage 2 - B (pin A3)
Serial.print("B ");
Serial.print(voltage[1], 1);
Serial.print("V ");
// voltge 3 - C (pin A4)
Serial.print("C ");
Serial.print(voltage[2], 1);
Serial.print("V ");
// voltage 4 - D (pin A5)
Serial.print("D ");
Serial.print(voltage[3], 1);
Serial.print("V ");
Serial.println("");
delay(10);
// reset count and sums
sample_count = 0;
for (l_cnt = 0; l_cnt < 4; l_cnt++) {
sum[l_cnt] = 0;
}
}

Processing:

//After getting the data of the first serial port
println(Serial.list());
// modify Serial.list()[0] to select correct serial port
　　 ser_port = new Serial(this, Serial.list()[0], 9600);

Function Description:

Serial Event:
serialEvent(Serial p)

Displaying the channel and voltage:
voltage (int channel, String volts)

Drawing graph axis:
DrawGraphAxis(int pos_x, int pos_y, int width, int height)

Drawing graph:
DrawGraph (String voltage, int channel, int pos_x, int pos_y, int scale)

Drawing scale and radio box:
DrawScaleSelect (int x_pos, int y_pos, int scale)

Step 3：Uploading the code and compiling successfully.

Step 4：Finding a battery or something similar and putting it between the red and the black lines, then watching the reading on the screen. Please refer to the image above.

==Result==

The voltage reading of the A5 pin will be displayed in Channel Four on the screen, just as follows:
[[File:AnalogVoltmeterResult.jpg|600px|center|thumb]]

==Video==

|}

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−	Step 3：Uploading the code and ~~compiling~~ successfully.	+	Step 3：Uploading the code and get it compiled successfully.

	Step 4：Finding a battery or something similar and putting it between the red and the black lines, then watching the reading on the screen. Please refer to the image above.		Step 4：Finding a battery or something similar and putting it between the red and the black lines, then watching the reading on the screen. Please refer to the image above.

Multimeter Simulation - 版本历史

Pkj：/* Debugging */

Pkj：Created page with "{| style="width: 800px;" |- | ==Objective== The course will show you how to simulate a multimeter with Microduino. The reading of the “multimeter” will be displayed on Pr..."