Hi i bought a hall sensor for a project the one needs to turn on a light when a magnetic field is near and turn off when isn't and i bought one turn on the light when is near but keeps on when is remove it
Which sensor i have to buy?
And if is posible that sensor to recognize polarity or intensity of magnet field to recognize when do the same to a second light?
Example: I have two leds and the main purpose of the project is to turn on only the led 1 when a magnetic field is near and turn off when isn't and the second if is possible is do the same to a second led with the same sensor maybe recognizing polarity or intensity to be able to switch leds ( both have to turn on only when a magnetic field is near and off when not but led 2 only when a polarity or field intensity change or another condition i be able to add to recognize to turn led 2 only)
Thanks and sorry for the writing English is my second language
Ratiometric Linear Hall Effect Sensor
For example Allegro A1321
Looking at the data sheet, I found this, so the answer should be yes.
A1321 Product Details:
Features and Benefits:
- Temperature-Stable Quiescent Output Voltage: Ensures consistent performance across a wide range of temperatures.
- Precise Recoverability After Temperature Cycling: Maintains accuracy even after repeated temperature changes.
- Output Voltage Proportional to Magnetic Flux Density: Provides a linear response to varying magnetic fields.
- Ratiometric Rail-to-Rail Output: Offers a full-range output, dependent on the supply voltage, for more precise measurements.
- Improved Sensitivity: Enhanced detection of small changes in magnetic flux density.
- Wide Voltage Operation (4.5 to 5.5 V): Compatible with a range of power supplies.
- Immunity to Mechanical Stress: Designed to withstand physical stress without performance degradation.
- Solid-State Reliability: Long-lasting performance with no moving parts.
- Robust EMC Protection: Engineered to resist electromagnetic interference, ensuring accurate and reliable operation.
Well the sensors come in a number of types. I think you're asking for something like the A1120 or similar, which is switched on with a South pole and switches off if the field is removed.
A1250 is turned on with a South pole, then latches on until turned off with a North pole.
A1324, A1325, and A1326 produce an analogue output proportional to the magnetic field, then it is up to you to add a circuit to interpret that.
Hi, @cuasitos
Can you please post a link to specs/data of your Hall Effect Sensor?
Can you please post a copy of your circuit, a picture of a hand drawn circuit in jpg, png?
Hand drawn and photographed is perfectly acceptable.
Please include ALL hardware, power supplies, component names and pin labels.
Can you please post your code?
Thanks.. Tom..
Thanks for the answer and the a1250 is the one i have on that case a1120 is the one i need because i need to turn on a light when a magnetic field is near and off when not. But i need if is possible to add another indicator like polarity or strength of the magnetic field to be able to apply the same to a second light
example light 1 turn on with south pole or a little magnet and only with this are near and when is not, is off and light 2 turn on when north pole o two magnets are near and off when not
thanks
thanks for the answer i don't have with me that because i wasn't able to work on my project because working scheduled but the only i need is to turn on and off two lights indistinctly when a magnetic field is near
light 1 turn on when a magnetic field is near but no 2 and both are off when not magnetic field near, light 2 when the magnetic field in near an another indicator turn on and when not both of
thanks
thanks
No. You need the one suggested by @kmin
It's substantial to understand difference between sensor and switch.
If you need to sense strength and polarity, you need a sensor, not a switch.
And 1120 is a switch.
My goal is to turn the light i wanted 1 or 2 with only one sensor and a magnet and i so confuse
But thanks if you can guide me
It's difficult to guide without scheme of your setup. At least you should mention if you use arduino in this setup?
Well what others are trying to explain is the 1120 functions as a switch that is either on or off, however as a switch it is very simple to use provided you only want on and off. You might mount two hall effect switches back to back so one detects North, the other detects South.
A sensor (instead of a switch) gives you far more flexibility but at the same time IT IS MORE WORK TO IMPLEMENT because you need a circuit (a microcontroller maybe) that takes the sensor's output and makes decisions.
Thanks thats clarify so much my confusion and in my case i need is a sensor because my project needs to identify the presence of the magnet and behave from that main purpose
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