Contents
What is the drawback of LM35 sensor?
LM35 temperature sensor is a small component such as a transistor (TO-92). Very easy to use components that is capable of measuring temperatures up to 100 degrees Celsius, but it is not suitable for measuring temperature sensor is included in the liquid.
What is the temperature range of LM35?
The LM35 device is rated to operate over a −55°C to 150°C temperature range, while the LM35C device is rated for a −40°C to 110°C range (−10° with improved accuracy).
How many °C does the lm35 temperature sensor read?
I had used several posts how to wire the thing to Arduino board and for and program the reading ( 1, 2, 3) and produced the code posted below. The sensor reading fluctuates really a lot – it jumps by some 3 to 7 °C after each reading regardless of reading frequency (tested with reading each 0.5 s, 1.0 s or 2.5 s).
Is the datasheet wrong on the lm35?
Either you have the connections wrong or the LM35 is toast. Please double-check the connection vs. the datasheet. I suspect just because of that particular voltage reading that you may have the connections mixed up. Edit: Thanks for the photo. Looking at the part from the front (the part with the markings) from left to right, the pin order is:
Is there a low impedance load for lm35?
You need to add a low impedance load between LM35 output and ground, can be 200 ohm as the data sheet recommends for heavy capacitive loads but I wouldn’t go that far, might be 1k or 2k to avoid self heating errors. No software only solution can solve this error. I guess when 0 = 0 and 5V = 1023, then you should divide by 1023.
Why is the lm35 output so sensitive to EMI?
The cause is the low sinking capabilities of LM35 output. This makes the output sensitive to EMI. Yes, the output output impedance is stated as 0.5 ohms but only for sourcing current. The sinking current is limited to 1uA which is easily achieved by the environment noise.