i would like to connect a preasure device to my mini2440, analogue signal is 4..20mA i got debian lenny with a patched kernel 2.6.39.1 running at the moment nothing is connected to ADC0 and a cat /sys/devices/platform/s3c24xx-adc/s3c-hwmon/in0_input delivered always a 2006 or 2010 or 2013 keep in mind, i am a newbie in electronic circuits/schematics. what value is this 2006? regards Alex
digital value '2006' = 2006 mV
hi juergen, thanx to everyone i did a little homework. the presure sensor deliver 4..20mA the adc can only handle 3,3V this means i must use a resistor of 165Ohm to protect my adc input right? (3.3V / 0.02 = 165Ohm) ain0 show 2006 mV -> 2.006V ain1-3 show something between 2939-3126 means 2,9-3,1V i dont have anything connected to the pins, why can i then see these 2-3V round there? thought it must deliver 0V round there, and when i connect my presure sensor, i will see some voltage round there. maybe silly newbie questions, but i dont understand it. regards alex
Ground the inputs and see if you get zero, or near zero. If not, you need to cause a new conversion -- take a new reading.
hi... can u plz tell me which type of ADC we are using in this mini2440.. is it successive approximation r flash r dual slope r ramp r any other.. and y v r using that adc....
Read the Samsung S3C2440 processor's datasheet.
Hi everyone.I have two question. First Can I compile in0_input driver source code on Fedora having linux 2.6.36. Second What I make changes on source code to connect AIN3. Please help me This is very urgent for educational project.