Digital thermometer circuit

Posted on Feb 7, 2014

A very precise digital thermometer with LM35 probe (0, 1 degree of freedom). The circuit has two adjustments. One of them, R5, adjusts the displays to 0. To perform this, we have to connect the extreme part of R4 (that goes to the temperature probe) to the ground and we turn R5 until we see 0:0:0. Afterwards, we connect the probe LM35 to terminals

Digital thermometer circuit
Click here to download the full size of the above Circuit.

2 and 3 which are marked in the circuit. This is how we Then we measure the values between the non connected terminal, which is the out of the probe, and the ground, with the tester, adjusted to 1 Volt (bottom of the scale). The tension which is shown represents the temperature in the room. For example, if it marks 0. 236, the temperature is 23, 6 C. When we have the measure, we connect the terminal 1 of the probe to the circuit and we adjust R7 until it gives us the value of what we had measured.

Leave Comment

characters left:

New Circuits



Popular Circuits

12V Powered 12V Lead Acid Battery Charger with Indicator
555 timer IC
preamp onboard
555 Timer Astable calculator for Astable Multivibrator Designing
The HDR and interval trigger
UC3906 battery charger controller circuit
1999 S10 2.2L Fuse Box Quesion. There are two (what appear