I changed the position and the configuration, give me the same results.
After looking for the devices, the wireless sd card is connected to SPI pins (6 pins), and the probe is connected to the pins 11, 12, 13. It is possible they some diferences?
After looking for the devices, the wireless sd card is connected to SPI pins (6 pins), and the probe is connected to the pins 11, 12, 13. It is possible they some diferences?
11, 12, and 13 are the SPI pins, where is the SD card connected then? Please post a photo of your setup.
I changed the position and the configuration, give me the same results.
That's what I would have expected, so your problem is gone. Or do I understand something wrong here?
I will put a photo, I give a mistake, the wireless board is connected to ICSP pin.
The ICSP header holds 5V, GND, Reset and the SPI signals in a Arduino-type independant way, so that signals are the same.
You didn't answer my last question: Is your problem solved? You told us that you tried both setups and got the same results, so my conclusion was that your problem disappeared. Is this assumption correct?
Typically the SD card's SS (Chip Select) pin is 10.
Is yours really on pin 4?
const int chipSelect = 4;
No, the problem maintains.
In the moment I use SPI.Begin(), the values from the probe change in second decimal plate and the signal from the probe need to be multiplier by 2.
Other functions add or changing the position of calling them, do not have results.
Typically the SD card's SS (Chip Select) pin is 10.
Is yours really on pin 4?
No, on most boards it's on pin 4. At least that's true for the Ethernet Shield and the Wireless SD Shield, which are two of the most common shields used.
In the moment I use SPI.Begin(), the values from the probe change in second decimal plate and the signal from the probe need to be multiplier by 2.
You didn't write before that you multiply the value by two. In this case it's clear that the resolution changes. Now we have to find the reason for getting just half of the value. Do you still use mode 3 on the SPI? That won't work with the SD card, it's a mode 0 device. And in your sketch you don't set the SD CS pin to HIGH before accessing the MAX.
Even though 'most SD cards SS (Chip Select) is on pin 4' it is not impossible that the SD is also on 10 like this SD card...
http://www.elecfreaks.com/wiki/index.php?title=SDcard_Shield
So I would double check.
Do you still use mode 3 on the SPI? That won't work with the SD card, it's a mode 0 device.
Yes, I had changed the SPI mode to all positions, and always both probe and sd card work well.
And in your sketch you don't set the SD CS pin to HIGH before accessing the MAX.
Let me check this.