Hello,
I'm using MCP3002 ADC to convert the analog voltage input to digital for arduino but i dont know how to program it.
Can some one help me with programming the arduino to do the converstion.
I have found this code but it reads zero all the way.
// MCP3002 - Example code using Arduino UNO.
// March 17,2013
// Wiring
// Pin 10 to /CS
// Pin 11 to Din
// Pin 12 to Dout
// Pin 13 to CLK
//
// Do a conversion on both channels and write results to serial port.
//
// Include the SPI library:
#include <SPI.h>
// Set pin 10 as the slave select for A/D converter
const int slaveSelect = 10;
void setup()
{
// Initialize serial port for com to host
Serial.begin (9600);
// Set the slave select pin as an output
pinMode (slaveSelect, OUTPUT);
// Initialize SPI
SPI.begin();
SPI.setBitOrder (MSBFIRST);
}
void loop()
{
// Going to be doing a conversion on both channels (ch0,ch1)
byte conversionMSB,conversionLSB;
word chA,chB;
digitalWrite (slaveSelect,LOW);
// Communication with the device starts when /CS line brought low.
// The first '1' bit transmitted is the start bit.
// The next 3 bits define
// Single Ended Input / Differential Input
// Ch0 / Ch1 if single ended input or polarity if differential
// MSBF / LSBF (Most/Least Significan Bit First)
// The returned value is ten bits long so if the bit pattern transmitted
// is placed correctly, the two most significant bits will be sent back
// with the first transfer. the rest on the second transfer.
conversionMSB = SPI.transfer (0x60);
conversionLSB = SPI.transfer (0);
chA = word (conversionMSB,conversionLSB);
digitalWrite (slaveSelect,HIGH);
Serial.print (chA,DEC);
Serial.print(" ");
Thanks for the help.
Hello,
I'm using MCP3002 ADC to convert the analog voltage input to digital for arduino but i dont know how to program it.
Can some one help me with programming the arduino to do the converstion.
I have found this code but it reads zero all the way.
// MCP3002 - Example code using Arduino UNO.
// March 17,2013
// Wiring
// Pin 10 to /CS
// Pin 11 to Din
// Pin 12 to Dout
// Pin 13 to CLK
//
// Do a conversion on both channels and write results to serial port.
//
// Include the SPI library:
#include <SPI.h>
// Set pin 10 as the slave select for A/D converter
const int slaveSelect = 10;
void setup()
{
// Initialize serial port for com to host
Serial.begin (9600);
// Set the slave select pin as an output
pinMode (slaveSelect, OUTPUT);
// Initialize SPI
SPI.begin();
SPI.setBitOrder (MSBFIRST);
}
void loop()
{
// Going to be doing a conversion on both channels (ch0,ch1)
byte conversionMSB,conversionLSB;
word chA,chB;
digitalWrite (slaveSelect,LOW);
// Communication with the device starts when /CS line brought low.
// The first '1' bit transmitted is the start bit.
// The next 3 bits define
// Single Ended Input / Differential Input
// Ch0 / Ch1 if single ended input or polarity if differential
// MSBF / LSBF (Most/Least Significan Bit First)
// The returned value is ten bits long so if the bit pattern transmitted
// is placed correctly, the two most significant bits will be sent back
// with the first transfer. the rest on the second transfer.
conversionMSB = SPI.transfer (0x60);
conversionLSB = SPI.transfer (0);
chA = word (conversionMSB,conversionLSB);
digitalWrite (slaveSelect,HIGH);
Serial.print (chA,DEC);
Serial.print(" ");
Thanks for the help.
Hi,
Welcome to the forum.
Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.
Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
What model Arduino are you using?
Thanks.. Tom... 
@FernandoLeite, please do not cross-post. Threads merged.
Yes I know i must not cross post but it was not my objetive. I wanted to post the code with code tags and then delete the first post but could see how to do it.
Sorry
TomGeorge:
Hi,
Welcome to the forum.
Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.
Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
What model Arduino are you using?
Thanks.. Tom...
Hi,
I'm using arduino Uno. I dont have the circuit with me but i've drawn a sketch wich i send as a attachment.
Hi,
OPs diagram;
What is the line you have written under the diagram?
I hope the gnd of the UNO and Vss of the 3002 are connected.
What voltage are you powering th e 3002?
Tom...
What i wrote was that ch1 is not used and that the VSS and Vdd are the supply contacts. The supply is 5V i think and yes the grounds are connected
