A 3144 SENSITIVE HALLEFFECT SWITCHES AH 3503 Linear

A 3144 SENSITIVE HALL-EFFECT SWITCHES & AH 3503 Linear Hall sensor TYWu

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

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

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.

Pins • Pinning is shown viewed from branded side

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

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 m. A. With suitable output pull up, they can be used with CMOS logic circuits

A 3144. pde int sensor. Pin = 2; int counter = 0; boolean sensor. State = false; void setup() { Serial. begin(9600); pin. Mode(sensor. Pin, INPUT); // Pull Up digital. Write(sensor. Pin, HIGH); }

A 3144. pde void loop() { if(magnet. Present(sensor. Pin) && !sensor. State) { sensor. State = true; print. Message("Magnet Present"); } else if(!magnet. Present(sensor. Pin) && sensor. State) { sensor. State = false; print. Message("Magnet Gone"); } }

A 3144. pde void print. Message(String message) { counter++; Serial. print(counter); Serial. print(" "); Serial. println(message); } boolean magnet. Present(int pin){ return digital. Read(pin) == LOW; }

Connection • Figure

Execution • Snapshot

AH 3503 • FEATURES – Extremely Sensitive – Flat Response to 23 k. Hz – Low-Noise Output – 4. 5 V to 6 V Operation – Magnetically Optimized Package

AH 3503 • Pins

AH 3503 • Block Diagram

AH 3503 • Electrical Characteristics

AH 3503 • 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.

Applications • Notch Sensor, etc.

Experiment • https: //www. youtube. com/watch? v=bn. Od 8 f 5 V ev 0 • https: //www. youtube. com/watch? v=a. Xe 92 l. Wa JAw • http: //www. hobbytronics. co. uk/arduinotutorial 11 -hall-effect

Experiment • Arduino ?

Experiment • Arduino const int hall. Pin = 0; // the hall effect sensor pin const int led. Pin = 11; // the LED pin int volt; void setup() { pin. Mode(led. Pin, OUTPUT); pin. Mode(hall. Pin, INPUT); }

Experiment void loop(){ int luminance; volt = analog. Read(hall. Pin); luminance = 0. 5*abs(volt-512)-1; //volt=0~255 analog. Write(led. Pin, luminance); }