Quote from: smcdouall on August 29, 2025, 04:12:04 PMHi, I'm getting an error with the code here when using the code in this tutorial https://tinycircuits.com/blogs/learn/arduino-speedometer-hall-sensor-magnet. unblocked games

The result from hall.readMag() in the TinyCircuits_A1454.cpp is always -1. This is because the x and y values in the function are also -1. This is regardless of the magnets position to the sensor. I have tried swapping out various sensors/cables/Arduinos and even tried it on other computers and it still doesn't work. Around two weeks ago this code did work as intended. I am wondering if there has been an update to one of the libraries that has caused something to no longer work?

I tried ChatGPT a little and it found that running the following:

byte err = Wire.endTransmission();
Serial.print("I2C error: ");
Serial.println(err);

Resulted in err = 2 which apparently means "2: Received NACK on transmit of address".

This apparently means the board sent the sensor's I²C address, but the sensor didn't acknowledge it (NACKed it)

It also suggested trying an I²C scan to see what devices it could find. The only one it could find was 0x70 which I believe is the TinyCircuits Wireling TinyShield.

Any help would be greatly appreciated. This code was working before and now doesn't when I've tried to upload it to other Arduinos/the same original one.

It looks like the hall sensor isn't being seen on the I²C bus. The err=2 means it's not acknowledging. Make sure you're using Wireling.begin() and Wireling.selectPort(port) before talking to it, since only the mux (0x70) shows up until a port is enabled. If it still doesn't show after that, either the library changed recently or the sensor module itself has failed.