The ForceTronics blog provides tutorials on creating fun and unique electronic projects. The goal of each project will be to create a foundation or jumping off point for amateur, hobbyist, and professional engineers to build on and innovate. Please use the comments section for questions and go to forcetronics.com for information on forcetronics consulting services.
Reduce Noise in Your Sensor Measurements with an Active Low Pass Filter Part 3
In this three part series we look at how to design a signal conditioning circuit to increase the accuracy and resolution of your ADC sensor measurements. The signal conditioning circuit consists of a double pole active Sallen Key Low Pass Filter and a non-inverting op amp. The filter portion is meant to attenuate high frequency noise from your sensor signal to increase measurement accuracy. The amplifier portion scales the signal up to the full range of the ADC to ensure you are getting max resolution. In part 3 we test our finished LPF + Amp circuit.