Sensors convert a physical quantity (e.g. temperature, pressure) into an electrical signal.
4
votes
1answer
153 views
Miniature wireless distance sensor
I am novice in electronics, so please bear with me.
I am searching for a small distance sensor (as small as possible) that I can use to measure a distance between 0 and 30 cm precisely (precision ...
3
votes
1answer
166 views
Charge mode piezoelectric signal conditioning
I have a charge-mode piezoelectric dynamic pressure sensor (datasheet link) that I want to read a signal from. If you look at the datasheet it says the sensor outputs are in a balanced and floating ...
1
vote
1answer
27 views
Choice of sensor for detecting touch (on/off)
I would like to detect a user's touch on a shop window (at a specific area, there would be a 'call to action' marking on the window, i.e. 'touch here')
Any sensor to detect this must be contained ...
1
vote
1answer
121 views
Detecting vehicle on parking spot
For a project we're working on we need to detect if a car is standing on a parking spot.
We're using an ultrasonic sensor for this, SRF05. While using the correct timings we can only sense for about a ...
1
vote
1answer
87 views
Interfacing with the MLX91206
I am planning on using an MLX91206 to measure the current draw of a set of Peltier elements. They draw up to 17.3A at 24V. However I would like to measure their current draw without interfering by ...
2
votes
0answers
116 views
Helicopter rotor blade system detection approaching objects
I am working on this project to detect anything that is entering the zone of RC helicopter blades (around 10cm diameter) region and stop the rotor. It needs to detect any solid object so metal or ...
2
votes
0answers
42 views
Can Position Sensitive Detectors electrodes be offset? How?
I've got a prototype board of a light tracking device based on a 2 dimensional PSD, but it suffers from important bias currents on one of the electrodes which could possibly clip the input to the ...
2
votes
0answers
90 views
comparator input latches high?
I am using a a TI TLV3202 comparator (U2B) with a bridge circuit as shown in the schematic below.
It is followed by a DG4157 analog switch. This is related to this question I had asked earlier.
...
1
vote
0answers
41 views
Can I use a capacitive sensor to detect a person proximity without touch?
I only see uses of capacitive sensor to detect touch. But I wonder if I can calibrate a capacitive sensor to detect if a person is close enough, even if the person is not touching it.
I intend to use ...
1
vote
0answers
56 views
How to get immediate state of DYP-ME003DD PIR sensor?
I am trying to detect movement for a project and have a DYP-ME003DD PIR sensor.
It has 4 pins, +,-,CDS (I think this is what it says, it's hard to read) & OUT.
When I connect it to my arduino and ...
1
vote
0answers
65 views
Bosch BMI055 Accelerometer/Gyro causes I2C bus to crash when issuing a softreset!
Datasheet: http://ae-bst.resource.bosch.com/media/products/dokumente/bmi055/BST-BMI055-DS000-06.pdf
I have recently integrated the Accelerometer of the BMI055
I added a soft reset of the chip at ...
1
vote
0answers
135 views
Measuring radon levels
I saw a commercial full built sensor/alarm which can measure it but I cannot find any IC with that function.
What is the type of component to use to measure radon level in the air?
1
vote
0answers
99 views
Detecting very simple movements (a hand waving) usable on 8bits microcontroller
Recently i saw a video about Nest Protect, an smart smoke detector, that can be operated by waving your hand under it. Since there is no visible holes on the lower part i suppose they are not using ...
1
vote
0answers
235 views
IOIO-OTG, PIR sensor and Bluetooth Interference
I have built a sensor motion device that is battery operated and sits in a small box. Its purpose to detect wildlife movement. The setup is as follows:
IOIO-OTG connected to a PIR ...
1
vote
0answers
105 views
Can internal PLL affect control logic in MEMS sensor?
I am trying to set up LSM320DL digital accelerometer-gyroscope. The gyro part works as it's supposed to, but I have no luck with accelerometer.
I cannot achieve communication between MCU and ...
0
votes
0answers
20 views
Pass sensor for robots
I would like to add a sensor to my robotcar. I would like to know when the robot enters to a room. One solution would be an infrared barrier, however I cannot add active sensor to the doors but I can ...
0
votes
0answers
47 views
How to use LM56 to switch on/off a 2kW heater using a MOSFET
I have an oil heater at 220V/2000W so lets say 10A (maybe more when it starts?!). I was thinking of creating a circuit to switch the oil heater on/off with a LM56. Is it possible using a MOSFET ...
0
votes
0answers
47 views
Vibration sensor for butterfly chrysalis
Which sensor to use for detecting a butterfly new born vibration? I need something simple, just with an alarm to warn me when the butterfly is just emerging from its chrysalis.
0
votes
0answers
34 views
Sonar sensor constantly gives similar output
I have a somewhat general question about sonar sensors.
I have three "SN-HRLV-EZ1" (maxsonar) sonar sensors and I use them to do obstacle avoidance. After a few crashes two of the sonars always show ...
0
votes
0answers
90 views
Poor man's IR obstacle sensor make sense(improve) from signal under daylight
I'm talking about this kind of sensor:
Question and then long description: can I do something to improve their blindness in front of window? At least for detection of object in front of the robot, ...
0
votes
0answers
43 views
8 IR sensors and 74HC4051 multiplexer where to place low pass RC filter?
So I've got 8 IR sensors like these
Then I connect them to multiplexer. And arduino will run mux's selectors through the loop.. Something about 5-10 times per second(read every sensor 5-10 times ...
0
votes
0answers
56 views
Simplest way to detect body heat
I need to detect how hot/cold a person is with a sensor (or multiple sensors) in close contact.
I've looked at temperature sensors such as 18B20 and TMP36 but I'm not sure how to detect if a person ...
0
votes
0answers
51 views
How hard would it be to make this? “Solar powered heater monitor”
I have a pump in a small underground opening, in winter it gets too cold for the pump to pump (frozen water). So I want to put a solar panel, a electric heating coil, a battery, a thermometer, and a ...
0
votes
0answers
73 views
Tilt, angle sensors for microcontrollers
I have a project in Arduino
I have three sensors.
One is a tilt sensor, the other is an angle, and the other one i dont know what it is.
They all look similar
Here is a picture of all three sensors
...
0
votes
0answers
80 views
Non invasive voltage detecion (AC 230V 50Hz) Galvanic isolated
I am putting together a PLC (Siemens Logo o Simatic) that will monitor a control line that supplies signal voltage (230V 50Hz) to a industrial sized heating unit (GAS). The control line has in series ...
0
votes
0answers
25 views
Setting the range of a grid thermal sensor
I have a question upon reading data through the thermal sensor row by row.
For example, my sensor has a 4x4 grids, I want to read each row and by taking the average temperature per row divided by ...
0
votes
0answers
64 views
How to set up communication channel between a PIR sensor and a computer
I need PIR sensors to send data to my laptop, preferably over wireless. What are the components I need to buy? How do I set them up?
Here's the background of the problem:
I want to deploy PIR ...
0
votes
0answers
50 views
Sensor placement, compressed sensing
Given: I have a beam fixed at one end and free at the other. It obviously results in vibrations due to the disturbances in the environment or when induced. This system can be represented using a ...
0
votes
0answers
71 views
Children's board book - embedded electronics for question and answer - capacitance sensor?
What are the components needed for a system to implement the following:
A children's board book with multiple choice questions on each page
a child will use an electronic stylus device (with ...
0
votes
0answers
73 views
What kind of sensor would be best for detecting a tap or touch on either of two 0.2" panes of glass?
I'm building this really cool double paned glass door with contrasting frosting as a feature between the two panes. It's a sliding bathroom door. Being high tech and all, I want to set it up with a ...
0
votes
0answers
65 views
Abnormal value of gyroscope's output data
I find some strange thing. When I collect data from a 3-axis digital gyroscope when keep it stationary, I get a few of abnormal value occurred sometimes. anymore, the evaluation board have stm32 arm ...
0
votes
0answers
51 views
Where can I find industrial type “conductive sensor”?
I am not sure whether I use the correct term. What I want is to detect whether a metal strip (5" long) sits on both point A and point B. I need a little voltage on point A. If the metal strip sits on ...
0
votes
0answers
117 views
How to pass +12V onto a wire without a relay?
I am working with hall effect sensor, which sends 10.75V on output wire when sensor fully active (the sensor is used in clutch pedal switch to tell the vehicle when clutch pedal is pressed or not). I ...
0
votes
0answers
81 views
Is it possible to count human with low current?
Please look at this project http://big.dk/#projects-vvv
Description says "A single person can activate the beating heart, but joining hands with others will make the heart beat even faster to create ...
0
votes
0answers
60 views
Strain gauge with non linear resistance
I have a system set up with a carriage that has this equation:
$$X(s)(s^2M+sB+K)=F(s)$$
With M=mass, B=viscous friction, K=spring constant, F is the Input.
Furthermore we have a strain gauge sensor, ...
0
votes
0answers
331 views
How to detect gestures with IMU
I am working on a project for which I need to recognize gestures in 3D space. I am building several modules, each of which can be held in one's hand. One can pick up two modules at a time and perform ...
0
votes
0answers
204 views
What is the output form of MQ-5 gas sensor?
Since it is a gas sensor I wonder how it will output the result? I read the datasheet but didn't really understand it.
Could anyone please help me? If I were to use it with Raspberry Pi, how would I ...
0
votes
0answers
90 views
Design of a tracking system via usage of frequency principles
I am working on a project for my Bachelor's degree in which I have to design and construct one primary and 1-4 secondary devices for tracking purposes. The primary device would need to be able to ...
0
votes
0answers
127 views
MCUs (Arduino) for simple Data-Glove should I go with 8 bit or 32 bit?
Not sure if this belong here or Robotic StackExchange, but since I think this question leans to choice of MCU I'll just ask here first.
First, I'm a beginner in MCU/Robotic world (been working with ...
0
votes
0answers
108 views
Wiring photoelectric sensor WL260-S270
I have two Sick WL260-S270 photoelectric sensors. As simple as it seems I have trouble wiring them. I have checked the datasheet and connected 12 V DC to pins 1 and 2. Isn't terminal pin 1 the ...
0
votes
0answers
92 views
Measuring exhaust and other gasses in atmosphere
I am in need of cheap (less than 20 dollars, preferably much less) sensors that would be capable of measuring various gasses in outdoor conditions in the atmosphere (such as CO CO2 NO NO2 various VOC ...
0
votes
0answers
119 views
CC2540-Honeywell SPI
I am now working with Honeywell HSCMRRN100MDSA3 pressure sensors, I want to establish a connection with TI CC2540 Bluetooth LE SoC, in SPI mode. Which ports of the TI SmartRF05EB Evaluation Board rev ...
0
votes
0answers
130 views
Sensing salt concentration in air
I need to measure salt concentration in air (coastal). Any ideas how?
I would prefer to have result real time and it can be up to USD 2000.
0
votes
0answers
120 views
bmp085 output is little off
I have got this Bosch barometric sensor BMP085 and im trying to make library for ARM LPC2000 microcontroller. Basically i have everything running but my reading values are wrong. I have tested ...
0
votes
0answers
521 views
PIR sensor current consumption too high. Need a different PIR?
I am trying to build a wireless motion detector that can work on a battery for a really long time. I am using this PIR sensor:
http://www.digikey.ca/product-detail/en/555-28027/555-28027-ND/1774435
...
0
votes
0answers
62 views
What values for Vin, V1, and V2 should I use to correctly program sensitivity parameter for A1362 sensor?
On pg. 15 of A1362 Programmable Linear Hall Effect Sensor you will see Voltage Pulse {High, Med, Low} defined for the Allegro A1362. Using observed values of MSP430's digitization, I need to select a ...
0
votes
0answers
79 views
Alter a temp probe for an interactive prop
I have been tasked with building an LCD or LED that says 78 Degrees and changes to the celsius equivalent with the push of a button. This is nothing more than a prop that kids can use to simulate ...
0
votes
0answers
97 views
Sensors used in play mats
Yesterday I went to one of the toy shops in a local mall and saw several play mats (mostly by hamleys). They were simple mats which responded when we do a gentle press on marked areas. I found the ...
0
votes
0answers
75 views
measuring vertical movement in a container
I am looking for a non-mechanical means to measure the descension of a plate within a container about 3cm by 15cm by 7cm. The plate is not terribly well guided so there is a need for a lot of room for ...
0
votes
0answers
156 views
industrial water quality sensor, with analog 4-20 ma output. slope and zero point values?
Hello I have an industrial water quality sensor that measures chlorine.
the sensor has an analog output of current (classic 4-20mA).
The sensor is already calibrated and shows the right value of ...
