Linear Hall Sensor Brick

Pictured with the KY-024 kit module plugged in.

Kit Bricks · SKU TP-K29

Measures magnetic field strength (49E).

₹299

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Works with TinkerPie V1 · Arduino C++ with the TinkerPieBricks library · Delivery across India: ₹100, 3–7 days · 7-day replacement for damaged or defective kits

About this kit

Measures magnetic field strength (49E). The Linear Hall Sensor Brick is a carrier for the KY-024 module from common 37-in-1 sensor kits: plug the module into the socket and connect one cable to a TinkerPie SENSOR port. A small CH32V003 processor on the brick does the timing work, so your program simply reads the result over I2C.

Features

• Field strength (analog)
• Threshold output (pot)
• Magnet distance / position
• Plug the kit module straight into the socket – no jumper wires
• One cable to any TinkerPie SENSOR port (I2C), BUS IN + BUS OUT to chain more bricks
• On-board CH32V003 does the timing – your code just reads the result

Specifications

How to use it with TinkerPie

1. Plug the KY-024 module into the 2.54 mm socket on the top edge. Match the pin names: the brick says AO G + DO, the module has the same letters.
2. Connect BUS IN to any TinkerPie SENSOR 1-4 port with a 4-pin JST-PH cable (the same cable as the other sensors).
3. More bricks? Plug the next one into BUS OUT. Two bricks of the same type need different addresses: bridge ADDR +1, +2 or +4 on the back (0x14-0x17; the first is 0x14).
4. Install the TinkerPie and TinkerPieBricks Arduino libraries, open the quick-start sketch below, choose the board ESP32S3 Dev Module and upload.

Libraries: TinkerPie and TinkerPieBricks (Arduino IDE: Sketch → Include Library → Add .ZIP Library). Full guide: getting started with TinkerPie Bricks.

Quick start

Upload this, open the Serial Monitor at 115200 baud and watch the TinkerPie matrix.

// Linear Hall Sensor Brick (TP-K29): quick start
// Reads the brick and shows the value on the TinkerPie matrix and in the Serial Monitor (115200 baud).
#include <TinkerPie.h>
#include <TinkerPieBricks.h>
using namespace tinkerpie;

tpb::KitAnalog a;

void setup() {
  Serial.begin(115200);
  tinkerpie::begin();            // also starts the SENSOR ports (I2C bus Wire1)
  if (!a.begin()) Serial.println("Linear Hall Sensor Brick not found at 0x14: check the cable to SENSOR 1-4");
}

void loop() {
  uint16_t v = a.analog();           // AO: 0-1023
  bool hit = a.digital();            // DO: above the level set with the blue knob
  Serial.printf("AO %u   DO %d\n", v, hit);
  led::plotBarGraph(v, 1023, hit ? Colors::Red : Colors::Green);
  basic::pause(100);
}

Project: Magnet distance meter

Bring a magnet closer to the linear Hall sensor: the bar grows, and it beeps when the magnet is very close.

// Magnet distance meter: Linear Hall Sensor Brick (TP-K29)
// Bring a magnet closer to the linear Hall sensor: the bar grows, and it beeps when the magnet is very close.
#include <TinkerPie.h>
#include <TinkerPieBricks.h>
using namespace tinkerpie;

tpb::KitAnalog hall;
int centre = 512;

void setup() {
  Serial.begin(115200);
  tinkerpie::begin();            // also starts the SENSOR ports (I2C bus Wire1)
  if (!hall.begin()) Serial.println("Linear Hall Sensor Brick not found at 0x14: check the cable to SENSOR 1-4");
  basic::pause(200);
  centre = hall.analog();             // no magnet near at start
}

void loop() {
  int strength = abs((int) hall.analog() - centre);
  led::plotBarGraph(strength, 300, Colors::Purple);
  if (strength > 250) music::playTone(1000, 50);
  basic::pause(50);
}

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