How to enable Analog output 4-20 mA?
I connect positive lead of multimeter to Ch1 of analog output through the 100 Ohm resistor. Common of multimeter connected directly to the ground of analog output. Controller powerd by 24 v power supply. Ch1 programmed as 4-20 mA raw. Multimeter reads 2.5 mA and stays constant no matter I am trying to write.
Am i missing something?
Heres the sketch I am using (standart example one)
#include <Indio.h>
#include <Wire.h>
void setup()
{
Serial.begin(9600);
Indio.analogWriteMode(1, mA_raw); // Set Analog-Out CH2 to mA mode and take raw DAC value (0-4096 -> 0-20mA).
}
void loop()
{
Indio.analogWrite(1, 2048, false); //Set CH1 DAC to integer value 2048 (approx 10.5mA).
do { } while (1); //Do nothing, program finished. Keep waiting.
}
Hi, are you using the latest version of the Indio library? i'm not sure as i see a 'Serial.begin(9600)' in your code, and the current D21G based version should have 'SerialUSB.begin(9600)' see https://github.com/Industruino/Indio
I have just run a test with your code and it works for me, so i suspect it is a library version issue. Also, you don't need the 100 ohm resistor, you can put your DMM between OUT CH1 and 4-20mA GND. If your resistor value is too high (above 1k) it won't work, as the DAC's output voltage is limited.
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| Asked: 3/21/19, 8:02 PM |
| Seen: 1876 times |
| Last updated: 3/22/19, 12:18 AM |