# Tagged Questions

135 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. ...
76 views

### Reversing a .5-4.5V analog sensor output to 5V-0V

I have a pulse width modulation (PWM) control board that uses a 0-5V input via a potentiometer to control a DC motor speed. As I understand how this works, the potentiometer goes from 0% PWM at 0V to ...
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 ...
242 views

### How to calculate permittivity of a fluid

I am confused about calculating permittivity of a fluid. Permittivity differs from one fluid to another. $$\epsilon=\epsilon_r\epsilon_0$$ Since it is an electrical property combined with an ...
275 views

I have current transformer coils to monitor a gas-powered AC generator output (A & B) and 4 load circuits. The output of the T1 coil with a 1500 watt load is about 30Vpp. Will this circuit ...
433 views

I'm trying to read values from a SCT-013-030 sensor that gives 0-1vac readings . My board analog inputs are 0-10vdc,giving me a value from 0 to 65500 . I need to know what is the best method of ...
166 views

### Read analog envelope by 8051

I am having a serious issue here. I've bought a Maxbotix XL ultrasonic sensor but I didn't know that it is the AE version, that does not come with pulse width, it comes with Analog Envelope. I have a ...
434 views

### Amplifying signal from CO2 Sensor

I am trying to amplify a MG811 CO2 sensor to a range readable by an ATMEGA2560 (0-5v). I have other analog sensors, so do not want to change ref voltage on Atmega. I have found a module that scales ...
292 views

### How to design for a component that says “Electrical Design: DC PNP” in the datasheet?

I'm not a guy from electrical engineering and I'm having a little trouble with a small garage project that I'm working on. I want to use a photoelectric sensor to measure distances. I'll probably ...
148 views

### Digital or analog transmission for transmitting data off-board?

I have some digital sensors with ADC build in and the problem is this type of sensor have lots of control pin. It is hard to separate this sensors from my mcu board. Analog sensors are much simple ...
116 views

I am designing a circuit, to use an ADC(mcp3008) to read voltage, current, and temperature sensors. I have a few questons about this, as I have never done this before. I am going to use single ...
306 views

### Are the resistance values (R1 and R2) in this circuit reasonable?

This simplified circuit is intended to sense two limit switches (which can never be closed simultaneously-- at least in theory). The voltmeter shown is a place-holder for a connection to an analog ...
819 views

### How much current is consumed by an avr analog sensor?

I'm trying to measure a small analog device that emits about a volt (I believe up to 5V, but I've not measured at extremes yet) AC. I rectify the reading to DC, but I'm really interested in getting ...
266 views

### Triggering for geophone triangulation

I'm using three geophones to triangulate impact events inside the triangle, e.g. a mallet hitting the floor. Since the magnitude of the event is unknown, the position is calculated only by the timing ...
493 views

### Any issues with using an opamp as a constant current source for temperature sensing?

I understand that most people use a bridge circuit for RTD and possibly thermistor temperature sensing. I'm trying not to do that for several reasons. I'd like to use an opamp in the classic ...