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Results tagged with sensor
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user 90588
Sensors convert a physical quantity (e.g. temperature, pressure) into an electrical signal.
0
votes
Volumetric air sensor for burglar alarm
This has very high resolution (and accuracy) MPL3115A2
- 20.4k
2
votes
What technology does smart keys for car use?
There are sensors around the car, and inside the car that probe the key with a 125 kHz signal. Based on how many sensors pick up the response from the key and the strengths of these responses, the car …
- 20.4k
0
votes
How to use photoresistor for counting passing objects
Alternatively, you could focus a light beam on the sensor from across the road (or use a mirror) and detect changes in that. …
- 20.4k
3
votes
Building a Ph sensor amplifier circuit
You need to use an opamp with low input bias current -- the LMC662 is suitable. Also a '741 doesn't have very good input or output common-mode voltage range and so may not work so well with just a 5 V …
- 20.4k
0
votes
Accepted
Oscilloscope or bench multi-meter for ultra high sensor sample rate measurement
Sampling rate is not a problem for oscilloscopes, but most lower cost oscilloscopes (e.g. less than about $2k) are only 8-bit resolution. Very expensive ones (over $5k) can be 10-bit resolution.
Some …
- 20.4k
19
votes
Does each IC need its own bypass capacitor when there are multiple ICs in the same circuit?
The decoupling caps need to be 'close' to the IC they are decoupling. 'Close' is ill-defined, and depends on PCB impedance as well as the noise level you can tolerate on the output and perhaps bandwid …
- 20.4k
1
vote
Accepted
Capacitance displacement probe guard ring circuitry
You need a buffer amplifier (e.g. opamp connected as a unity gain buffer) to drive the guard from the sensing electrode signal. That way the voltage difference between the guard and the sensing electr …
- 20.4k
1
vote
How to track the 3d movement of a small animal in a 4x4x8 meter cage?
I don't know if I am allowed to post URLS to products, but search for decaWave -- they have 3D low power trackers with 10 cm resolution.
If there are (optical) obstructions, then cameras won't work; …
- 20.4k
1
vote
Accurately isolate force cell
When you switch off each sensor (e.g. M1), turn on the corresponding new FET also. The new FETs should have drain = '+' input; source = junction of sensor and existing FETs. … By switching the bottom node of each sensor to the '+' input, the unused sensor will have nearly zero V across it and therefore will not affect the behavior of the circuit. …
- 20.4k
0
votes
Calculation of an error of a non-linear FSR produced by the connection of the voltmeter
If the resistance changes quadratically, isn't the equation:
R = k.F^2. ?
However this is inconsistent with the 2 end points given (1g == 1 MΩ; 1000 g = 1 kΩ), and in fact inconsistent with resistance …
- 20.4k
0
votes
Zener diode as temperature sensor
Just use 3 standard diodes in series. At room temperature, each diode will be about 0.6 V, and the V will fall by about 2 mV per degree C rise. So 3 in series will be about 2.1 V at room temperature a …
- 20.4k
0
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RC peak detector calculation
It appears your sinusoid is 770 Hz. The selection R.C filter at the output is constrained at the upper frequency level by this 770 Hz and at the lower level by the bandwidth of the signal you are det …
- 20.4k