That would be impossible when the sensors share the I2C address. There are a few specific Arduino things to mention.ĭuring Arduino setup() a sensor is often checked if it is connected and if it is possible to communicate with a sensor. Your question is very similar to the question that you already found: /questions/417263/multiple-instances-of-same-device-on-i2c-bus. The NCD2400M operates at 3.3V and 5V, so that will work with every Arduino board. There is no risk for damaging something, but the risk is the reliability. Based on that I now understand at least there would be a problem when only one of the chips tries to send NACK bit. I guess there could be issues when one of the chips fail? Can I assume in this case that nothing goes wrong with the ACK/NACK bit since the chips are "identical"?Īfter using correct keywords for searching I found this previously asked question. However, I'm new to I2C protocol and I'm not yet aware of every detail. I tried so that I connected SDA and SCL of four chips and used RC circuit and square wave to check the rise time to verify that every chip indeed changes their capacitance. I have already tried commanding them simultaneously and it works like a charm. For the commanding I use Arduino (Nano currently, might change to some other Arduino model).
I have no reason to identify them, only commanding. I have no need of reading anything from those, which is the reason I was thinking why should I bother multiplexing my I2C line. I have multiple digital capacitors ( NCD2400M by IXYS) and I would be using them so, that I always send the same command to every chip. What if I still use multiple devices with the same address, what can go wrong? Let me describe the situation: I know that I2C devices are supposed to have unique addresses when used.
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