Sensors convert a physical quantity (e.g. temperature, pressure) into an electrical signal.
3
votes
1answer
66 views
Temperature current source using a LM35
Anyone care to explain how this piece of circuit work?
I already build it and it works wonders but I can't figure it out.
0
votes
3answers
51 views
Modifying a digital LED thermometer kit to drive larger 4" 7-segment LEDs?
I'm interested in building an LED digital thermometer with 3 or 4 large 4"/100mm 7-segment LED display digits (for example, Kingbright SA40-19EWA). There are plenty of kits available which come with ...
8
votes
2answers
193 views
Collimating a sonar beam
Wondering if anyone is aware of a way to cause an ultrasonic proximity sensor to be modded, such that, it's forward line-of-sight range remains unaffected, but it's angular spread is reduced, somewhat ...
-3
votes
0answers
54 views
Sonar sensor distance measure for UAV [closed]
My sonar sensor is connected to the autopilot (APM 2.5) and autopilot is connected to my PC through RF module. I need to measure the distance by running a C code in my PC. As I am new to writing C ...
7
votes
3answers
259 views
Circuit works on breadboard but not PCB
I have a fairly simple circuit that works perfectly on the breadboard, but I am having a lot of trouble transferring it to a PCB. I am seeing very strange behavior which lies outside of my current ...
0
votes
1answer
109 views
Water level: BIG capacitive level sensor with steel bars?
So I want to measure water level under a bridge, or inside the city drain.
Would it be possible to run two long (4 meter) metal probes, each one enclosed inside a PVC pipe, and placed one next to the ...
1
vote
2answers
66 views
Recommended Sensor? Distance - High Heat & Dusty
I'm after a sensor and I'm wondering what would be the best type for the following.
Requirements -
Accurately measure in the 5-10mm distance range, +/- 1mm.
Sense small undulations in a surface ...
2
votes
1answer
70 views
Can I electronically trigger a PIR motion sensor?
I would like to trigger a PIR sensor using an infrared LED. Is that possible? My goal is to simulate motion in front of the PIR, when there otherwise is none. I tried using a handheld remote ...
1
vote
2answers
48 views
How can I make a motor stop when the output of a PIR sensor is below a threshold?
I will attach a PIR sensor to a motor and i want the motor to stop turning when the output of the PIR sensor ( http://www.rapidonline.com/pdf/61-1466.pdf ) is below a threshold. I also want the motor ...
4
votes
3answers
77 views
Is the Excitation Voltage of a load cell a strict specification?
When using load cells (or strain gages generically), is the Excitation Voltage spec provided as a strict minimum -- or is it just a recommendation which one can go below as long as one is OK with a ...
1
vote
2answers
89 views
Is is possible to produce a resistance that represents the average of two thermistors?
For example, if I want to connect 2 thermistors to a thermostat in a circuit and then return the average resistance between the two of them to the thermostat's ADC.
-2
votes
0answers
23 views
Where can wireless force and speed recording sensors and digital readout equipment be found? [closed]
I am trying to find a supplier of small, no larger than about 1 inch square wireless sensors that can measure the speed and force of a boxers punch. In addition, I would like a digital display, or an ...
-4
votes
0answers
54 views
Real-time, precise motion detection of objects in large spaces. Where to apply this technology? [closed]
at University we are working with a technology that:
generates 3D models of its surrounding space (range up to 10m)
with high precision (1mm)
with high robustness (against interference)
can ...
-1
votes
3answers
94 views
No previous knowledge of programming, considering electrical engineering [closed]
I am still at school and wont finish until 2015 but i have seen people control doors, toy cars etc with their iphones and i really want to get in to something like that.
I have a lot of spare time ...
-1
votes
0answers
28 views
resolver sensor [closed]
I need a resolver sensor for my project, to sense the angle of the motor shaft. Can anyone suggest from where can i get it? And it should be without a decoder chip. Input=v sin(wt) and outputs= v ...
