Hall Sensor returns random values - unaffected by presence of strong magnet

[garyjamessilva]

Since v1.0.5 update, hallRead() return random data. (Was working ok in V1.0.4)

When a strong magnet is present near chip random data persists as though magnet has no effect on hall sensor.

Same results when trying 2 different Sparkfun ESP32 Thing Plus boards.

using Mac OSX as build device

---

int val = 0;
void setup() {
Serial.begin(115200);
}

void loop() {
// put your main code here, to run repeatedly:
val = hallRead();
// print the results to the serial monitor:
//Serial.print("sensor = ");
Serial.println(val);//to graph

delay(100);
}

Debug Messages:

4:51:56.272 -> -170
14:51:56.272 -> 71
14:51:56.272 -> -268
14:51:56.272 -> -263
14:51:56.272 -> -263
14:51:56.347 -> -263
14:51:56.347 -> -294
14:51:56.347 -> -295
14:51:56.347 -> -297
14:51:56.347 -> -53
14:51:56.347 -> -172
14:51:56.347 -> -170
14:51:56.347 -> -170
14:51:56.347 -> 93
14:51:56.347 -> -167
14:51:56.347 -> -167
14:51:56.347 -> -168
14:51:56.347 -> -172
14:51:56.347 -> -166
14:51:56.347 -> -167
14:51:56.347 -> -166
14:51:56.347 -> 72
14:51:56.347 -> -173
14:51:56.347 -> -171
14:51:56.347 -> -170
14:51:56.347 -> -167
14:51:56.347 -> -164
14:51:56.347 -> -168
14:51:56.347 -> -168
14:51:56.347 -> 71
14:51:56.347 -> -234
14:51:56.347 -> -238
14:51:56.347 -> -261
14:51:56.347 -> -264
14:51:56.347 -> -266
14:51:56.347 -> -266
14:51:56.347 -> -291
14:51:56.347 -> -60
14:51:56.347 -> -170
14:51:56.347 -> -170
14:51:56.347 -> -162
14:51:56.347 -> 68
14:51:56.347 -> -234
14:51:56.347 -> -145
14:51:56.347 -> -168
14:51:56.347 -> -169
14:51:56.347 -> -171
14:51:56.347 -> -169
14:51:56.347 -> -171
14:51:56.347 -> -166
14:51:56.347 -> -168
14:51:56.347 -> 93
14:51:56.347 -> -170
14:51:56.347 -> -168
14:51:56.347 -> -170
14:51:56.347 -> -169
14:51:56.347 -> -169
14:51:56.347 -> -170
14:51:56.347 -> -169
14:51:56.347 -> 71
14:51:56.347 -> -269
14:51:56.347 -> -266
14:51:56.347 -> -263
14:51:56.347 -> -263
14:51:56.347 -> -263
14:51:56.347 -> -296
14:51:56.347 -> -295
14:51:56.347 -> -48
14:51:56.347 -> -170
14:51:56.347 -> -168
14:51:56.347 -> -172
14:51:56.347 -> 67

[codemee]

I got the same issue in Windows. Downgrading the ESP32 package to 1.0.4 or 1.0.3 solved the problem.

[lbernstone]

I'll fix this in v2.0. For 1.0.x, you can use this:

#include <driver/adc.h>
void setup() {
Serial.begin(115200);
}

void loop() {
Serial.printf("idf read: %d\n", hall_sensor_read());
delay(100);
}