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Member Since 24 Jan 2013
Offline Last Active Sep 05 2015 05:52 AM

Posts I've Made

In Topic: I2C issue with multiple sensors

28 December 2014 - 05:00 AM

just to close things off, the solution was to use the right resistor values.


did not know about having to use certain ohms depending on the capacitance of the bus.

When I was using one device, I had the right resistance and it worked.

using two devices, the capacitance changed, but the resistance stayed the same, which did not let the bus function properly.

the more devices you have, the less resistance you need.


Hope this will help someone who got stuck like i did ;)

In Topic: uNFC - NFC library

07 December 2014 - 10:37 AM

Hi Paolo,


Thanks for doing the hard yards.


I have got the following NFC board http://www.aliexpres...2038722238.html

Have configured it to use I2C, but not having any luck communicating with it.

Using 2.2KOhm pull up resistors and have tried both 3.3V and 5V.


The Execute in I2CWrite fails with write = 0


Any idea on what it could be?

PN532 is a specific chip from one company only, right?


I have an I2c lux meter and that works fine.


FW 4.3.1

In Topic: I2C issue with multiple sensors

22 October 2014 - 12:40 PM

Have you looked at this for multiple devices on the I2C bus?

Thanks for the reply and sorry for the late response.

I am using something similar to the second post in the link.

In Topic: I2C issue with multiple sensors

10 October 2014 - 02:15 PM

do you have the 2 devices on the same I2C address, thats the first thing you have to tackle.

Thanks for the reply.


the PH sensor has addr 0x4D and the Lux sensor has 0x23

the thing i do not understand is that even though the second sensor is not even initialized, the reading of the first one fails.

the app is setup to only read the Lux sensor and by just adding the second hardware to the bus, reading of the firs one fails.

In Topic: FileStream Write blocks multi threaded app

21 August 2014 - 11:03 AM

Not a nice workaround, but It seems all good now.

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