LM35 Sıcaklık Sensörü Nedir? Nasıl Okunur? #TK #2

LM35 Sıcaklık sensörü bir çok uygulamada kullanılabilecek, yüvenilir ve piyasan temini kolay bir sıcaklık sensörüdür.

LM35 2-150 veya -55-+150 santigrat derece arasında ölçüm yapabilir.

LM35’e ait datasheet dosyasını aşağıdaki linkten indirebilirsiniz.


Bu yazıda temel santigrat ölçümünün nasıl gerçekleştirileceği ile ilgili bir anlatım yapılacaktır.

LM35’e ait kılıf seçenekleri aşağıdaki gibidir.

Öncelikle datasheette belirtildiği gibi VS +4 ile +20V arasında beslenir.

Sonrasında çıkış ucu ortam sıcaklığına göre çıkış üretmeye başlar. Bu sensör sıcaklık verisini lineer olarak voltaja çevirir.

Datasheette +2-+150 santigrat derece aralığının 0V’tan başlayarak her bir santigrat derece için 10mV artacağı gösterilmiştir.

Yani çıkış gerilimi 0V ise ortam sıcaklığı +2 veya daha düşük bir değerdedir. Ancak sıcaklık 2 dereceden yukarı çıktıkça çıkış gerilimi de 1 derece başına 10mV olarak artacaktır. Örneğin

3 derece 10 mV
12 derece 100mV
120 derece 1V
121 derece 1.01V
123 derece 1.02V

Bu değerler bir işlemcinin analog girişine verilerek ortam sıcaklığı santigrat derece cinsinden bulunur.

Bu işlem için genel formül aşağıdaki gibidir. Okunması rahat olsun diye bu biçimde yazılmıştır. Uygulama kodunda sadeleştirilebilir.

Sıcaklık = 2 + ( ( ( VADCRef * ADCDeğer ) / 2üssüADCBitSayısı ) /0.01 )

Formül örnek olarak 5V’ta çalışan 12-bitlik bir sistem için;

Sıcaklık = 2 + ( ( ( 5 * ADCDeğer ) / 4096 ) / 0.01) şeklinde olacaktır.

Konu ile ilgili sorularınızı yoruma bırakabilirsiniz.

İyi çalışmalar!

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