Sensors convert a physical quantity (e.g. temperature, pressure) into an electrical signal.

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Acs712 current sensor ic interfacing with ade7858(energy metering ic)

I am trying to interface Acs712 current sensor IC with an energy metering Ic(Ade7858),there are two problems am currently facing. 1) The energy metering Ic takes in bipolar input (± 0.5 V) which is ...
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18 views

Available frequency bands for wireless sensor networks

I am developing a wireless sensor network for use in North America and Asia and I am trying to decide the operating frequency. Is there some table that summarizes the available frequencies for ...
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1answer
19 views

Pt 200 Sensor Reading

Are the connections for reading a temperature sensor using CCS( constant current source) really like in my picture? The analog and the current source seem to be shorted.
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2answers
97 views

Designing PCB with Multiple power supplies

This is my first REAL project and i need some help. I'm working on a project where I am trying to design a PCB for controlling the environment inside an enclosed cabinet to grow a tomato plant using ...
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2answers
52 views

How to stop a motor when car approaches wall - phototransistor?

In a school competition for my son, he wants to make a toy car that will stop before it hits a wall (before, not making an impact). It can go as slow as it likes and cannot be remote controlled. I ...
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39 views

How is an accelerometer initially calibrated?

Referring to a MEMS accelerometer, how is the laboratory, initial calibration being carried out? Is the gravitational acceleration involved as a reference, or is the actual analog data being ...
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24 views

Displacement using accelerometer using known constraints

I am looking to find out the amount of displacement (x,y,z) over a period of 3 seconds using an accelerometer, in this case, the ones found on the iPhone. The purpose is to attach the iPhone on the ...
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1answer
18 views

ad5359 address not shown

I am working AD5259 , its a digital potentiometer. Its connected to i2c bus on raspberry pi. But the address of device is not shown. Datasheets says its 0X18. I guess the device does not respond to ...
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1answer
58 views

Electronic hit detection

I'm building various r/c vehicles like warplanes, tanks, auto-turrets, etc. and I want to fit some of them with some kind of a weapon. I've decided an air soft gun is a good choice. So, mounting and ...
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26 views

How can i balance rc helicopter using tilt sensors [closed]

I have a project upon RC helicopter making. i have searched so much but i did not get better information about how to balance helicopter. some sites says balance bar is used for balancing and some ...
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1answer
27 views

AC alternative for DC diode short-circuit protection

I have two sensors (represented in the schematic below by a switch) connected to a light. If one of the sensors trips, I would like the light to switch on. The sensors and light are directly on AC, ...
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1answer
43 views

Detect open or closed circuit via USB sensor

I have a relay which I need to detect the state of (similar to this question but no current flow) and would like know what the easiest method would be to detect the state via USB and Raspberry-pi. I ...
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3answers
493 views

Functionality of Accelerometers

Is it possible to do a speedo meter with an accelerometer ? I am working with Arduino hardware.
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31 views

Controlling servo torque

TL;DR : Can I control a servo's torque by PWM'ing a PWM ? I'm thinking about buying a dynamixel AX18 and I would like to be control it's output torque. If I modulate the input command, I expect the ...
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23 views

SPI: problems communicating with sensor using Arduino [migrated]

I have a sensor which I am trying to communicate with over SPI using an Arduino UNO. It is my first time using SPI and I'm experiencing some problems which I'm hoping are just due to some ...
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1answer
34 views

Can I measure large force using series FSR?

Is it possible to measure large force using multiple Force Sensitive Resistors in a series? Will I have to stack the resistors up? Will the measurement be reliable if I place them side by side? I ...
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1answer
25 views

Hall Sensor NJK-5002-C Configuraion

Here is the link to the sensor I am talking about. Now the problem is that according to the label it has as shown, it says that Brown wire goes to V+, Blue wire to V- and the Black wire goes to ...
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2answers
92 views

Self Contained Temperature Display in Very High Temp Environment

I want to build a temperature sensor + display that will operate in a high temperature environment (routinely 120C, but periodically spiking to 175C, and might be exposed to 350C where it would be ...
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27 views

Wire button to hall-effect sensor

I'm a little stuck at the moment. I'm trying to wire paddle shifters to my car and the only way to do so is the hard way by wiring the paddles directly to the sequential output on the gear selector. ...
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1answer
64 views

How to Design Arduino Voltage and Current Sensing Shield

I am trying to design an Arduino shield that measures raw voltage and current of a small refrigerator (115V, 60W). I have an Arduino Mega board. To one of the ADC inputs I have connected a (non-split) ...
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3answers
74 views

How to change analog sensor signal to appropriate levels for microcontrollers?

I have a FUTEK CSG110 amplifier, conditioning a signal provided from a load cell, providing a -3V to 3V signal. I can change this range to my liking, however I will be stuck with a +- voltage ...
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2answers
44 views

How to detect remaining capacity in a Lithium-ion battery?

I need my device to have multiple power sources, and connect to different power supplies depending on power availability. Each power source is a different rechargeable, Lithium-ion battery like this ...
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0answers
21 views

PIR sensor as smoke/fire detector?

We are looking for a sensor to be able to detect human activity(for security) , and also fire/smoke/heat etc , that doesn't consume a lot of current . I have read a few article,that you can achieve ...
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2answers
51 views

A question about ultrasonic sensors in general

Do ultrasonic sensors send out waves in a straight line, all the way to a reflecting substance (if any) and get reflected in the same line back to the receiver? Or do they send out a wave which ...
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1answer
87 views

Long range sensors - Ultrasonic/IR/LiDAR/laser - for microcontroller

I want to build a sensor module that has a long range. I was going to use an ultrasonic sensor for my project where I needed to know the exact distance of an obstruction in the path of a moving ...
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19 views

Digital Pressure sensor designing

I'm designing a digital pressure measuring meter; the pressure is of 0.3 Bar(Max) but the pressure to be measured is 8 Bar(Max). I proposed to use a pressure reducer (we use voltage divider in ...
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1answer
24 views

Are Bioimpedance sensor different from Biopotentials sensors?

I am building an portable health device , for which i am want ECG , GSR etc. then i came across 2 terms Bioimpedance and Biopotentials. Are these two same. Also can any one say the applications of ...
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24 views

Loading new drivers

Suppose I'd like to make changes to the drivers of ADXL345 for SPI by building on https://github.com/analogdevicesinc/no-OS/tree/master/drivers/ADXL345 How should the updated drivers be loaded? Should ...
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3answers
62 views

Liquid throughput hall sensor giving odd number of pulses plus only works in horizontal level

I'm an IT guy, but have lately started working more and more "on the edge" as we say, so close to the real world and with low level sensors. I'm currently building a liquid throughput sensor and ...
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3answers
275 views

Using a microcontroller ADC to measure a 4-20mA sensor

Question from a SW Engineer again. I've got a device which is mains powered and outputs a 4-20mA current depending on the flow rate in a pipe. I'd like to measure that flow rate with a ...
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1answer
62 views

9V battery is not able to power 2 sensors. How can I do it?

I wanto to power an IR sensor an ultrasonic sensor (HC SR04) and a sound module APR33A3 IC through a 9V battery connected with a LM7805. When I connect my atmega32 to the computer and power the ...
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4answers
298 views

chopper-stabilized op-amp latching up, cheap op-amp doesn't

I have a simple pressure sensor buffer/amplifier that I'm experiencing some weird latch-up when using a fancy chopper-stabilized op-amp for U2. The pressure sensor is an MDPS-002 (the 700kPa ...
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2answers
42 views

Detecting object Water Reservoir

You have this large water reservoir, for example, a bathtub. How can you detect when an object is thrown (rock, etc) into a big water reservoir? Vibrating sensor, ultrasonic etc?
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23 views

make hc-sr04 receive from another one

I have 3 ultrasonic Sensor (HC-SR04), i want to use one of them as transmitter, and the other as receiver, i want to let the first one send ultra Sonic waves and the other receive these waves from the ...
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55 views

chosing the right Hall effect sensor

For a student project, I need a Hall Effect current sensor. What I am going to do is to charge 8 rechargeable Li-Ion batteries of 3.7 volts in series with 34 volt supply and the buck circuit frequency ...
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31 views

How to connect ultrasonic distance sensor

I can't find any schematic example how to connect sensor which is used in cars as parking sensor to measure distance. (where is only one transducer sensor used as RX and TX) Can someone give me some ...
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1answer
28 views

Measuring distance sensor in short range to soft materials like wool, fabric and hair? [closed]

I need a type of sensor for my project to measure distance with average precision and between 0 up to 10 centimeter to soft materials like fabric, wool and hair? I looked a lot but unfortunately no ...
3
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1answer
78 views

How to drive a sensitive, constant-current, 1MHz resistive device?

I am currently working with sensors which are mostly resistive (100 to 600 ohms on average) and need to be fed with a controllable bidirectional constant current (from -1mA to +1mA with a resolution ...
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1answer
36 views

ic relay.. is there any delay for the responz of <İC insıde the circuit

Regarding SPDT ic relay TS5A3157. Do we have a delay responz inside the İc/ do we have a click sound. Because im startıng for a new project that can switch wireless, bluetooth or ir. What i need on my ...
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46 views

Sensor circuit simulation / Fault detection

I am working on a project that requires the simulation of a hall effect sensor. The application is an electronic stability control (ESC) (aka Vehicle Dynamics control or VDC) system on a 2014 Subaru ...
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1answer
31 views

Acquiring and fusing data from different controllers

TL;DR: What are some options to fuse data acquired with separate controllers? I'm developing my own IMU for a quadrotor. My inputs are an accelerometer, gyro, magnetometer, and barometer all via I2C ...
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61 views

Ultrasonic HC-SR04

The range of ultrasonic is more than the 20khz Then why does the HC-SR04 states 40hz what is it?? in datasheet it is specified as working frequency? Also the frequency of sound depends on the medium ...
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25 views

What sort of sensors are used in Luna, smartbed device?

Luna is basically a sheet that is placed on your bed and measures temperature, then adjusts it for you with the optimal condition. I was wondering what kind of temperature sensor they use for reading ...
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1answer
280 views

Shallow underwater wireless sensor network

I need to make shallow (max 2m) underwater wireless sensor network. Data payload is about 10kB/s. I know that VLF band (~3-30kHz)could be the best solutions for that, but cause of time-to-market I ...
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1answer
47 views

Create a vest to detect contact

I want to make a laser hunt type game with my son using Nerf Guns. I can modify the Nerf bullet to put some sort of device on the top of the bullet (obviously something not too heavy). It would be ...
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1answer
60 views

Pros / Cons of LM35 and Thermistor, what alternatives?

I'm wondering which benefits/downsides I have using following thermometer? Is there something I'm overseeing? For easy temperature measuring, what would be the easiest? My Opinion is LM35, am I right? ...
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4answers
183 views

How to best connect a temperature sensor to an aluminum block?

2 questions: How would you connect a temperature sensor to an aluminum block? Could I use a thermal adhesive, basically just gluing the sensor to the block? Which sensor would you buy? I like the ...
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1answer
32 views

Type K thermocouple durability in semimolten plastic

I want to measure the temperature of a semi-molten piece of plastic, but for my final application I don't want to have to touch the thermocouple. This means it will more than likely end up in the hot ...
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1answer
65 views

How do I model a charge source in SPICE?

I would like to model a force sensor based on a piezoelectric crystal that generates 10pC/N and has a static capacitance of 20pF in LTSpice for simulation purposes. How can I do this?
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104 views

LM35 and 4-20 mA output

I have a school project where I have to test a sensor and then measure the output with a multimeter. I'm using a LM35DZ piece which gives as output itself a linear voltage of 10mV/C degree. However, ...