Tagged Questions

1
vote
2answers
158 views

Fix the Problem for Shunt Resistor due to Temperature & Current Sensor

I am trying to build a current sensor here. My original thoughts starts from this paper [real-time current-waveform sensor with plugless energy harvesting from AC power lines for home/building ...
1
vote
1answer
104 views

ZXCT1009 as a current monitor

I am currently using ZXCT1009 high side monitor for monitoring the current consumption on a bus line for an embedded system we are developing. I am currently using tek scope with Labview for ...
0
votes
1answer
93 views

Can I hook this breakout board up to the thing I want to measure?

I have a piece of tech that uses somewhere between 50-200mA, and I want to continuously measure the current used. To this end I have found this: Sparkfun ACS712 breakout board Allegro ACS712 chip ...
1
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2answers
344 views

Current measuring with PIC

I know it is possible to measure analog voltages with the ADC peripheral of advanced PIC microcontrollers. There is no peripheral to measure current though. Is it possible to convert a current to a ...
1
vote
1answer
66 views

RF current output from microcontroller?

I am producing a PWM pulse of say 5Mhz from one of the pin of PIC micrcontroller and I want to drive this to high speed buffer, what is the best way to transfer this RF current from the pin of uC to ...
3
votes
1answer
183 views

Driving servos using microcontroller and current limiting

I am new to electronics and would like to design a PCB that uses an Atmel microcontroller, and powers three servos. I was thinking of designing the PCB with a single power supply. The servos I have ...
7
votes
1answer
170 views

Current flow priorities in PSU / PSU review

Being an electronics hobbyist, I'm having quite a challenge to design a PSU, which must run both on batteries (during the night time) as well as on Solar energy (daytime). The device is intend to run ...
3
votes
2answers
1k views

Arduino/Atmega with TIP120/121/122 transistors: base current question

I am learning about transistors, and can't seem to find the answer to a few questions which are stumping me. I will be referring to the TIP120/121/122 Darlington Transistor. As I understand ...
1
vote
1answer
173 views

Estimate Current Requirements Of A Circuit

So far with all my electronics circuits I have been using a DC wallwart so didn't have to think much about the current requirements of my circuits. Now I have a prototype that I would like to run ...
0
votes
2answers
320 views

Measuring power/current

I was wondering if someone knew how to measure power/current and then interface it to a micro controller to store the data onto some external memory. I basically want to measure the power a device ...
2
votes
3answers
716 views

Calculate how much current is a microcontroller's pin drawing

I am reading up on microcontrollers and I want to know the current that RA0 is drawing when the switch is open but I think I'am getting it wrong. Also my electronics knowledge is elementary at best. ...
2
votes
1answer
1k views

Transistor current limiter, microcontroller controlled?

I've come across a few transistor current limiter schematics, similar to this one: However, I am not entirely sure how I could implement microcontroller functionality to control this. I think ...
1
vote
2answers
350 views

Is there a device to control the current in a solenoid

I want to control the current in a solenoid using a microcontroller. Ideally, I would an IC which can do PWM with per-cycle current limiting, with an SPI input. Something like the Allegro A3972, with ...
3
votes
2answers
1k views

How much current can a microcontroller/DSP pin sink/source?

I'm using a TMS320F2812 and want to drive LEDs of some of the pins. I couldn't figure out what the safe levels of current were which could go in or come out of the IO pins from the datasheet. What is ...
5
votes
2answers
692 views

Programmable current source

I need to build a programmable current source from a 8051 microcontroller. It needs an output current from 0 to 10mA maximun. How do i go about doing this? what circuits do i need to build? I was ...