Tagged Questions
5
votes
1answer
100 views
How can I use a generic doorknob as a capacitive touch sensor?
I would like to use a generic doorknob that's installed in a typical wooden exterior door as a capacitive touch sensor. I have found various references for the circuit, but I have some questions about ...
2
votes
2answers
137 views
Expanding Range Of Analog Values From Temperature Sensor
I'm trying to build a temperature controlled relay module with an ATtiny45 ( Arduino UNO R3 as ISP ) and a NXP KTY81-222 Temperature Sensor.
The temperature range i want to monitor is 20°C to 30°C.
...
4
votes
2answers
99 views
Connecting Analog Signals Between Boards
When you have a sensor with an analog output on one board, and an analog-to-digital converter (ADC) on another board, what's the best practice in connecting them together? For example, if you have a ...
0
votes
0answers
67 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
1answer
68 views
multiplexing 16 sensors
I need to read 16 color sensors(TCS3210) one after another. So I am thinking of connecting all the outputs to a single atmega32 i/o pin and selecting a sensor using a demux showing low on the output ...
0
votes
2answers
197 views
Designing a good RF Transmission/Reception system for Embedded System
I want to have 4 sensors transmitting information to a microcontroller ie
4-bit Encoder -> Transmitter >>>>>>>>>>>> Receiver - > Decoder -> MCU
The problem I have is that if I use 4 transmitters and ...
4
votes
1answer
359 views
How to inteface LDR with microcontroller?
I need to interface LDR with micro controller,
While searching some circuit ideas on the internet I came across two different ideas.
One was using a voltage divider circuit with another resistor and ...
0
votes
2answers
560 views
How to interface a digital scale strain gauge weight sensor with a microcontroller? [duplicate]
Possible Duplicate:
How to interface a digital scale strain gauge weight sensor with a microcontroller
How to interface a digital scale strain gauge weight sensor with a microcontroller?
It ...
-4
votes
1answer
211 views
How to interface a digital scale strain gauge weight sensor with a microcontroller [closed]
It is a Load Sensor(SEN-1638) Which can be used to Measure upto 110 Pounds
So,How To Interface the above sensor to a Microcontroller Component?
3
votes
3answers
487 views
Detecting dry-running of water pump
What are some reasonably reliable ways of detecting that a water pump (electrical motor based) is "dry running", i.e. no water is passing through the pump either because there is no water available at ...
4
votes
3answers
440 views
Water level detection, where water is somewhat polluted and has significant dissolved salts
Found this excellent QnA here which provides several options for measuring or detection water-level. For my case, it is enough to differentiate 4 levels of water (very low, low, middle, full), of the ...
0
votes
1answer
161 views
Microcontroller of choice for home sensor network (confusion) [closed]
I'm building a sensing network for my home. It will be controlling 10 areas with around 120 different sensors - temperature, humidity, air quality, natural gas, light, moisture, smoke and motion ...
-6
votes
2answers
99 views
(Need help ASAP!) Electric motor bike with BASIC Stamp [closed]
We're doing the project is to develop an electric motor bicycle to assist the bike rider going up steep hills. In our project, we modified a bike with combination of electric motor, goniometer sensor ...
1
vote
2answers
266 views
Using an LM34 temp sensor, how can I limit the range of temperatures?
Over the next two weeks, I'm going to be building a greenhouse fan system. It's not for a real greenhouse, though. It's just for fun. Anyway, my plan is to use the Dragon12+ board that I have, an ...
5
votes
2answers
429 views
Capacitive touch sensors, how do they work?
David mentions capacitive touch buttons in EEVblog #130 - The uCalc Credit Card Scientific Calculator / Computer and indeed I have read about capacitive touch buttons before like in the documentation ...
2
votes
3answers
341 views
Microcontroller or arduino alternative for small cell-phone sized device?
I am doing a project in which I need to read RGB values from a color sensor TCS230 and send it to a microcontroller and use an linear equation to get glucose value from it and display it on an LCD.As ...
2
votes
5answers
595 views
Measure Water Flow in a Swimming Pool
I've got an inground swimming pool, and was inspired by an ill-formed question that was recently posted. I would like to non-invasively measure the volume of water my pump is circulating through the ...
2
votes
1answer
270 views
Finding a sensor for vibration of impact event, preferably for interface with arduino
Vibration Sensor, I want a really high tolerance, I intend on using this to measure the vibration generated when dumbells are thrown onto the floor in a gym.
Because, I have familiarirty with the ...
0
votes
3answers
192 views
How to initialize stepper motor?
Friends,
My robot is actuated by a stepper motor, so I can keep track of positions changes while the power is on. But how can I initialize the robot at power on ? Do I need a sensor ?
This is in case ...
2
votes
1answer
229 views
Adding an Obstacle Avoidance Sensor to a PIC
I have a PIC16F917 microcontroller that is used to operate a robot. I would like to add a sensor to it that will allow me to detect obstacles. How can I determine what sensor I should be using for ...
1
vote
1answer
515 views
Soft i2c with Sensirion SHT21 sensors on Arduino Mega
I have tried checking with an oscilloscope on the analogue pins when the sensor is plugged in and I don't seem to get anything as I normally would.
The hardware i2c channel works just fine on the ...
1
vote
1answer
346 views
Connect PIR Motion Sensor to Air Pump
I would like to hook up a PIR motion sensor like the one found here with a standard electric air mattress pump like the one found here. I'm pretty sure this is basic electronics stuff but I have zero ...
3
votes
1answer
234 views
How to make an entire (irregular) surface sense touch with a capacitive sensor?
I'm looking for a way to make a surface touch sensitive. The sensors have to interface with a keyboard encoder to send signals to the computer as keypresses. This is just the way it has to operate. I ...
9
votes
5answers
554 views
Fault modeling for embedded systems
I have a wireless sensor circuit with a microcontroller and a 2.4 GHz transceiver module, some integrated sensors with I²C interface, a UART port and the necessary discrete components.
This board is ...
3
votes
3answers
270 views
Onboard temp sensor for household thermostat - accurate enough?
Many microcontrollers, such as the TI MSP 430 have an on board temperature sensor. If one is designing a typical smart thermostat for heating/air conditioning is this sufficiently accurate or would ...
4
votes
4answers
314 views
Wake up on movement
My circuit application requires processing during physical activity, but it can be put to deep sleep for long periods of inactivity. I need a "true" or "false" output from a sensor that can be used ...
0
votes
2answers
322 views
Creating an IR sensor
Is a PIR sensor as easy as just a receiver? Rather than use some pre-canned device I was planning to just hook up an IR LED to my microcontroller and then read the IR sensor/receiver for a threshold ...
-4
votes
1answer
144 views
What does it mean 0.1“ w.c. to 20” w.c.? [closed]
It is in a Dwyer series 607 datasheet ( Low Range Differential Pressure Transmitter).
4
votes
3answers
549 views
How are Sensors Interpreted by the Microcontroller?
I've always wondered this, how exactly are sensors interpreted by/for the microcontroller?
Like lets use an example of a Heat Sensor...how exactly is something like say.....an Arduino interpreting the ...
1
vote
1answer
327 views
Interfacing a flow control sensor with a microcontroller
How can I interface this sensor with a microcontroller?
It has a normally open output and it will work @ 24V.
If I feed the BK contact from the sensor to a pin of the microcontroller through a voltage ...
5
votes
3answers
506 views
Rather complicated sensor network
I was working on a project recently and it was the first one which was involved enough to make the sensor networking complicated. In the end, I think the communication was the bottleneck in terms of ...
1
vote
1answer
262 views
Microcontroller board with ethernet for computer sensors
I'm considering the possibility of using an ethernet-connected (SNMP would be a bonus) microcontroller board of some sort to monitor a RAID card inside a server that doesn't have OS support; the card ...
5
votes
3answers
234 views
What external sensor could detect if a cd-tray had opened?
What would be a sensor that I could use to detect if my desktop's CD tray has opened?
There are so many sensors to choose from in the Digikey catalog.
Should I use a mechanical component?
A ...
18
votes
13answers
3k views
Level of a water tank with a microcontroller
How do i measure the level of a water tank with a microcontroller?
7
votes
3answers
816 views
How do I detect the pattern of the knock on a door, and use it as a signature to unlock a door?
How do I detect the pattern of the knock on a door, and use it as a signature to unlock a door?
