Hi, 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.
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.
Solved it. Looks like the issue was I was using the digital hall sensors instead of the analogue ones. Looking on this https://learn.tinycircuits.com/Wirelings/Hall-Effect_Wireling_Tutorial/ you can see the two sensors do vary slightly (the analogue one has a larger chip).
Just posting my reply here in case this helps anyone else out in the future.
Quote from: smcdouall on September 01, 2025, 08:30:17 AMSolved it. Looks like the issue was I was using the digital hall sensors instead of the analogue ones. Looking on this https://learn.tinycircuits.com/Wirelings/Hall-Effect_Wireling_Tutorial/ you can see the two sensors do vary slightly (the analogue one has a larger chip). Pacman 30th Anniversary (https://pacman30thanniversary.io/)
Just posting my reply here in case this helps anyone else out in the future.
Seeing "Received NACK on transmit of address" is frustrating! Have you tried shortening your I²C wires? I had a similar issue once, and simply using shorter, higher-quality wires solved the problem, seemingly addressing some signal degradation.
Could signal degradation be the issue?
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 (https://unblocked1games.github.io/)
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.