Arduino DigitalRead Generating Strange Results

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22

Thanks I will give that a try

Sorry I am a total novice re electronics just trying to find me way step by step to be able to build the proof of concept I am trying to create.

I really appreciate the time you have gone to look at the doc and provide the solution.

Claude Raiola
0414 228 948

23

Re the pics I sent, I did record a clip demonstrating the live process but the form server does not allow clips to be sent only still pics

Claude Raiola
0414 228 948

24

Hi

To further clarify the use of the led was to illustrate it does activate as expected using tut digital output from the device.

Yet when the output is connect to arduino it deems idle state to not digital low.

I am not wanting to activate tut led via arduino

I am needing arduino to recognises idle state to be digital high and active state of digital output to be low.

Then based on which digital output is detected as low will determine what text I output.

Just wanted to clarify in case thr 450ohm resister was reared to the led activating when I just need the arduino to reliably detect the high or low depending on whether the digital output is active or not

Claude Raiola
0414 228 948

25

Hi Claude,

The GV300W outputs use a method common in electronic equipment. The output relies on external equipment to provide voltage and resistance.
…
While writing this reply a thought occurred to me.
…
An electronic circuit needs to be a loop. Current needs to flow through the circuit from the supply to the ground. If this does not occur the voltage is said to float; the results could be as you have experienced. It could also explain why it works with one output connected but not with 2 or 3.

How exactly is the Arduino connected to the GV300W ??
The GND of the Arduino needs be connected to the GND of the GV300W. (see pic below)

pin 7 OUT3 to Arduino pin
pin 8 OUT2 to Arduino pin
pin 14 OUT1 to Arduino pin
pin 6 GND to Arduino GND

When connected like this there will be a complete loop for current flow. The Arduino ground will be referenced to the GV300W ground. It will not be floating. (see UNO pic below, GND pins)

Regards
Jim

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26

Hi James

Sadly I need to move away from digital option as I have just found via manufacturer only 2 of the 3 digital outputs are configurable via the unit receiving external commands and I need 3 to give me enough combination of output.

So this forces me back to my initial approach sending serial output commands which then output serial output to the arduino.

I abandoned the serial approach in preference to digital as I am having issues reading the serial output and also the fact it’s rs232 which needs to be converted to tll

So now it’s a different hill I need to try and work out

Regarding your assistance and diligence to assist I cannot comment your exception level of technical assist and persistence high enough. Please feel free to use this last paragraph as a feedback / reference in support of your dedication to provide tech support

Claude Raiola
0414 228 948

1 Like
27

Two devices that might help with RS232 for the Arduino. I cannot comment on their work ability or ease of use.
But I have used a USB shield for the Arduino, which worked perfectly.
Both DFRobot and Seeed Studio make reputable products, I have bought many of their items in the past.

Cheers, good luck in your adventures.
Jim


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