Reed Switch Brick

Pictured with the KY-025 kit module plugged in.

Kit Bricks · SKU TP-K15

Glass reed switch with comparator: door / window sensor.

₹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

Glass reed switch with comparator: door / window sensor. The Reed Switch Brick is a carrier for the KY-025 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

• Digital output with sensitivity pot
• Analog level at the same time
• Counts magnet passes
• 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-025 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.

// Reed Switch Brick (TP-K15): 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("Reed Switch 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: Door open alarm

Stick a magnet on the door and the reed switch brick on the frame. Opening the door plays a chime and counts the openings.

// Door open alarm: Reed Switch Brick (TP-K15)
// Stick a magnet on the door and the reed switch brick on the frame. Opening the door plays a chime and counts the openings.
#include <TinkerPie.h>
#include <TinkerPieBricks.h>
using namespace tinkerpie;

tpb::KitAnalog reed;
bool wasClosed = true;
int opens = 0;

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

void loop() {
  bool closed = reed.digital();       // magnet near: DO on (turn the blue knob if needed)
  if (wasClosed && !closed) { opens++; music::playMelody("E5 C5", 240); basic::showNumber(opens, Colors::Cyan); }
  wasClosed = closed;
  basic::pause(50);
}

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