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A3144 SENSITIVE HALL-EFFECT SWITCHES & AH3503 503 Linear Hall sensor

A3144 SENSITIVE HALL-EFFECT SWITCHES & AH3503 503 Linear Hall sensor. TYWu. Hall Effect. V H = I * B / (n * e * d). Theory. The Hall switch is characterized by the magnetic switching points BON (or BOP ) and BOFF (or BRPN). Theory.

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A3144 SENSITIVE HALL-EFFECT SWITCHES & AH3503 503 Linear Hall sensor

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  1. A3144SENSITIVE HALL-EFFECT SWITCHES &AH3503 503 Linear Hall sensor TYWu

  2. Hall Effect • VH = I * B / (n * e * d)

  3. Theory • The Hall switch is characterized by the magnetic switching points BON (or BOP ) and BOFF (or BRPN).

  4. Theory • If the magnetic flux exceeds BON , the output transistor is switched on; if it drops below BOFF, the transistor is switched off. The magnetic hysteresis BHYS is the difference between the switching points BON and BOFF.

  5. Pins • Pinning is shown viewed from branded side

  6. Electrical Characteristics • At VCC = 8 V over operating temperature range.

  7. Electrical Characteristics • Each device includes a voltage regulator for operation with supply voltages of 4.5 to 24 volts • Reverse battery protection diode • Quadratic Hall-voltage generator • Temperature compensation circuitry • Small signal amplifier, Schmitt trigger, and an open-collector output to sink up to 25 mA. With suitable output pull up, they can be used with CMOS logic circuits

  8. A3144.pde int sensorPin = 2; int counter = 0; boolean sensorState = false; void setup() { Serial.begin(9600); pinMode(sensorPin, INPUT); // Pull Up digitalWrite(sensorPin, HIGH); }

  9. A3144.pde void loop() { if(magnetPresent(sensorPin) && !sensorState) { sensorState = true; printMessage("Magnet Present"); } else if(!magnetPresent(sensorPin) && sensorState) { sensorState = false; printMessage("Magnet Gone"); } }

  10. A3144.pde void printMessage(String message) { counter++; Serial.print(counter); Serial.print(" "); Serial.println(message); } boolean magnetPresent(int pin){ return digitalRead(pin) == LOW; }

  11. Connection • Figure

  12. Execution • Snapshot

  13. AH3503 503 • FEATURES • Extremely Sensitive • Flat Response to 23 kHz • Low-Noise Output • 4.5 V to 6 V Operation • Magnetically Optimized Package

  14. AH3503 503 • Pins

  15. AH3503 503 • Block Diagram

  16. AH3503 503 • Electrical Characteristics

  17. AH3503 503 • Operation • The output null voltage (B = 0 G) is nominally one-half the supply voltage. • A south magnetic pole, presented to the branded face of the Hall effect sensor will drive the output higher than the null voltage level. • A north magnetic pole will drive the output below the null level.

  18. Applications • Notch Sensor, etc.

  19. Experiment • https://www.youtube.com/watch?v=bnOd8f5Vev0 • https://www.youtube.com/watch?v=aXe92lWaJAw • http://www.hobbytronics.co.uk/arduino-tutorial11-hall-effect

  20. ? Experiment • Arduino

  21. Experiment • Arduino const int hallPin = 0; // the hall effect sensor pin const int ledPin = 11; // the LED pin int volt; void setup() { pinMode(ledPin, OUTPUT); pinMode(hallPin, INPUT); }

  22. Experiment void loop(){ int luminance; volt = analogRead(hallPin); luminance = 0.5*abs(volt-512)-1; //volt=0~255 analogWrite(ledPin, luminance); }

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