Organize and Share your Electronics the way you want. Sign-Up for a free account now. It takes only 30 seconds!

Simple pendulum tiltmeter

Simple pendulum tiltmeter

Jbeale shared his tiltmeter project in the forum:

Apparently the most popular sensor for this purpose is an “electrolytic tilt sensor”, basically a bubble level with internal electrodes. These are not exactly consumer items. I tried building a simple pendulum tiltmeter using a split-photodiode, Optek OPR2100 (about $10 from Mouser) and LF411 opamp. The pendulum is a 0.064 x 3/4″ x 12″ strip of brass (K&S Metals #8247). Light from a 3W LED shines through a slit at the bottom of the pendulum into the detector. I have the photodiodes in zero-bias mode, wired anode-to-cathode so in balance, the current from one photodiode circulates through the other photodiode. This way the opamp only sources or sinks current (into the photodiodes, through feedback resistor Rf = 1 Mohm) when there is an imbalance in the photodiode current (= light level). I used a LF411 at +/- 15 V because I had it handy; I guess a more modern design would use a 5V single supply opamp and generate a 2.5V midpoint reference somehow. The pendulum will swing a long time unless damped, so I used a magnet assembly from an old hard disk drive for damping (eddy currents in the brass pendulum provide the force), this worked nicely.

Via the project log forum.

Read more Here







 

More Articles to Read

An Arduino laser pinball machine
An Arduino laser pinball machine
CTCSS fingerprinting: A method for transmitter identification
CTCSS fingerprinting: A method for transmitter identification
TI DLP® Pico™ Technology for Aftermarket Head-up Displays
TI DLP® Pico™ Technology for Aftermarket Head-up Displays
Brute force computation for cheap log digital potentiometer
Brute force computation for cheap log digital potentiometer
Smart "Homer"
Smart "Homer"
A DIY Segway-style vehicle
A DIY Segway-style vehicle
Superbeta transistors inside: Die photos and analysis of the LM108 op amp
Superbeta transistors inside: Die photos and analysis of the LM108 op amp
Peeqo is a desktop bot that communicates through GIFs
Peeqo is a desktop bot that communicates through GIFs
Using a Programmable Input Multiplier to Minimize Integer Boundary Spurs
Using a Programmable Input Multiplier to Minimize Integer Boundary Spurs
Serial seven segment LED display shield
Serial seven segment LED display shield

Top


Shares