Tagged Questions

A device which includes a central processing unit (CPU), memory, and (generally) an assortment of I/O peripherals (UART, ADC, DAC, general-purpose I/O, I2C, etc.) in a tightly-coupled standalone package.

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-3
votes
1answer
31 views

Selection of mcu [on hold]

I wanted to learn to use mcu's. Which is the best microcontroller to start off with? The one that I have in mind is: Small, Easy to find resources for projects , Easy to use, Easy to upload program to ...
-2
votes
0answers
12 views

control circuit of humanoid robot: is it worth to learn and use ROS [migrated]

i am building the upper body of a humanoid robot for my MSc thesis project with 24 dc motors and multiple sensors(something like i-cub or Nao) i have basic knowledge of communication protocols and ...
2
votes
2answers
51 views

Which microcontroller for audio synthesis/processing?

I want to get started designing my own hardware (digital) audio devices for signal generation and processing. The end goal is to design products which will be part of a modular synthesizer system. ...
-1
votes
3answers
72 views

How to identify the type of a microcontroller?

Assuming that we have an application which a lot of devices can connect and interact each other (like Internet of Things). Is there a way to identify the micro-controller that each connecting device ...
0
votes
2answers
47 views

Micro controller serial communication question

Im relatively new to micros and have a conundrum. My senior project involves using a touch screen and xbee modules for wireless communication. My question is, since both of them require serial ...
0
votes
5answers
71 views

Shortest time to visibly light LED

What is the shortest time (pulse 010) to visibly light a LED? Visibly = The human eye can see the LED blink. I use 5V as source and PIC16F628A@20MHz for the project. Here is a datasheet for the ...
1
vote
2answers
64 views

PIC32 Peripheral Pin Select for Digital Output

I'm using a PIC32MX250F128B for a project to drive several digital outputs; I need to control the digital output for about 13-14 pins. (using the code below). These pins work: RA0, RA1, RB0, RB1, ...
0
votes
0answers
21 views

Atmega 168A fuse programming

I'm currently programming over an Atmega 168A micro controller through a USB Tiny programmer and an ISP interface. The micro controller is set up with an external oscillator and an external person ...
0
votes
1answer
23 views

How to connect 5X7 LED dot matrix which has 7X7 pin both side.

I have 5X7 led dot matrix. But I am confused, how to connect it. Because it has 7 pin both the side. So, I am not going to differentiate that which is Row and column pin.
1
vote
1answer
48 views

1-Wire Serial communication to standard RX/TX Serial ports in microcontrollers

I just want to start by saying that I'm relatively new to electrical engineering in general, so if I sound absolutely retarded please bear with me. As part of a learning project I'm working with a ...
5
votes
5answers
713 views

Safety of using microcontrollers such as Arduino

I have been learning how to work with Arduino Uno R3, and it seems very intuitive and exciting for me. As many agree, I see lots of benefits of learning to use it at a young age. I would like to ...
4
votes
2answers
742 views

How does a ps2 mouse send data to a computer? [on hold]

I want to read data from a mouse with the help of Arduino. I want to calculate relative motion between two objects. My questions are 1) Is it possible? 2) How is mouse interfaced with Arduino?
1
vote
1answer
94 views

Why not use audio codec chip as measurement ADC/DAC?

I am working on a project that needs simultaneous ADC/DAC. The specs of the on-board ADC in typical microcontrollers are pretty weak, and separate ADC with good specs are much more expensive than ...
0
votes
0answers
42 views

Is it possible for the Server that can call GSM/GPRS modules on demand basis

I am working with a project on communication between SIM900 GSM module and a server. Project consist of a client device(enabled with gsm/gprs) and a server system. The client can communicate with ...
1
vote
0answers
25 views

Help with PFM with PID Control on dsPIC30F2020 (Pulse Frequency Modulation)

I'm using the dsPIC30F2020 trying to do a project that compares and contrasts PWM and PFM bucks converters. I have the PWM buck converter working perfectly. So for the PFM I used the exact same code ...
1
vote
1answer
39 views

Input/output pin resistance for an AVR microcontroller

For example, when driving a logic-level MOSFET directly from a microcontroller, what is the smallest gate resistor that can be used? Specifically for AVR microcontrollers; i.e. this datasheet, the ...
4
votes
3answers
67 views

What facilities/methods exist to debug and simulate programs for PIC microcontrollers

In the university, even though I did do some PIC programming and project, the project was quite simple. We could always put in a blinking LED as a sign of life into our program or have the code write ...
2
votes
5answers
161 views

Does the color of Jumper cables matter?

Does the color of jumper cables in a circuit matter? I'm starting out with Arduino and can't get it to work at all with a breadboard! I'm thinking it's something simple like this! I know Black is ...
0
votes
1answer
41 views

control circuit of a humanoid robot (something like i-cub or Asimo)

my friend and I are building the upper body of a humanoid robot for our MSc thesis project. There are 24 dc motors in this robot the thing I want to know is what is the best way to command these ...
1
vote
2answers
49 views

Long term effect of over-voltage on clamping diodes and ADC reference voltage

I am contemplating building a small voltage/current monitoring circuit that needs to monitor a wide range of voltages and currents. Currents will just be a single low-side shunt. Monitoring will be ...
0
votes
2answers
78 views

PIC16F877A Timer0 delay problem?

To get min 5ms square wave. I chosen prescalar as 1:32 (The internal clock given 4Mhz), what will be the TMR0 register value? Is it 0x64 or 0x63 !!
0
votes
0answers
13 views

Reading Mac data of Zigbee protocol stack

I am working on a project using one of the popular Zigbee based RF-MCU Mac-codebases. I have integrated a sensor to the MCU and the same is reading data and I am sending data to the gateway using the ...
1
vote
1answer
57 views

Capacitive touch on off power switch

Is is possible to use capacitive touch as a power switch for an embedded project? Can a microcontroller turn itself off and somehow still monitor an input pin? Or is there a dedicated IC that can ...
6
votes
4answers
1k views

What is the function of a diode connected to a GPIO?

I'm reading a schematic (done by a former employee) with a microcontroller, and I came across this circuit: What is the function of D1? Also, I think that R2 isn't necessary, because the control ...
1
vote
0answers
34 views

Circuit that takes input signal and controls led

I am trying to design a circuit that compares a recorded signal to a stock signal. If they are not similar it then inputs a signal into a circuit which will change the pulse of the led to stimulate a ...
2
votes
0answers
41 views

Cross Correlation values

I'm trying to develop a flow meter using the cross correlation algorithm. I'm using 2x IR leds and 2x phototransistors and a MSP430F5529. One pair of phototransistor-Led go in the upper level and the ...
1
vote
1answer
38 views

Can I connect my ADMP401 straight to my computer's microphone jack?

So I'm looking to get a bit more value out of this little 'ol microphone I have. It has a Vcc, GND, and an analog data port on the breakout board. Could I splice a 3.5 mm jack wire and connect the ...
0
votes
2answers
101 views

Embedded system for image processing project

Is it possible to do image processing (to extract numbers and text) using a microcontroller? If not, what are the alternatives to do this task?
0
votes
0answers
27 views

stm32f0 USB keyboard LED controlling with DataOut or RxReady0 with endpoint 0

I am making a USB keyboard using stm32F0RBT6 micro-controller. I want to receive data from PC for Caps Lock and Scroll Lock leds. Do I need to initiate a callback funtion like those ones? ...
0
votes
1answer
36 views

Proteus doesn't show the value of float variables and does not attribute values to them

I have an issue with Proteus Isis. The image below illustrates the problem. I can't see the values of a struct's fields and I think that Proteus can't see the struct too. Full Resolution Anyone ...
1
vote
4answers
127 views

Relay alternatives that are silent and support 500mA+

What can I use as a silent "general-purpose" relay alternative? There are various scenarios where I will need a relay-like device that allows me to control one circuit with a separate isolated ...
0
votes
2answers
45 views

Ignore voltage below threshold

I am trying to detect the presence of +12v on V2 to trigger a digital pin on a micro controller. I am using an opto isolator as I am under the impression that it is the best way to isolate my ...
-2
votes
0answers
54 views

Currency Converter [closed]

so I would like to ask you guys to help me creating a program of a Currency Converter using mcu 8051 ide software.. using c++ is easier but unfortunately, the task needed us to do it in 8051.. ...
1
vote
0answers
68 views

Missing clock edges when using SPI on the CC430

I'm currently using the CC430F5137 and I'm having an issue with using SPI to communicate with an external flash. I'm currently using DMA to send out SPI comms using the UCSI_B module. Most of the ...
-3
votes
0answers
56 views

Example for currency converter program using mcu 8051 ide software [closed]

I want to ask if anyone have an idea on how to write a program for currency converter using mcu8051ide software. The program is for the connection between the keypad and the lcd of the circuit using ...
-2
votes
0answers
62 views

Currency converter program using mcu8051ide [closed]

i want to ask if anyone have an idea on how to write a program for currency converter using mcu8051ide software. Any country currency also dont mind because I just want to see the basic idea of ...
10
votes
6answers
3k views

4 MBit != 512 kB?

I'm working with a Fujitsu microcontroller and I think I'm a bit rusty on the following details, that's why I'm asking this question. I have the following specs: 4M-bit flash memory Built-in ...
1
vote
2answers
51 views

STM8L Timer 1 unexpectedly low overflow frequency

I'm running the MCU off the high speed (16MHz, confirmed) internal oscillator and I've configured timer 1 to overflow with maximum overflow frequency: ...
0
votes
2answers
40 views

Programmer for MSP430F2274 TI microcontroller

I want to program that specific microcontroller (MSP430F2274) and i would like to hear your opinion on what programmer to choose . I prefer one that can be used with a linux machine. So what you ...
0
votes
2answers
65 views

Choice of the appopriate conditional statement

I'm measuring the width of a PWM puls with the external interrupt: ...
0
votes
6answers
149 views

how to know how many bits a microcontroller has?

How can I know what kind of architecture a microcontroller has? For example where can I read in the datasheet of the pic 16F873 how many bits architecture is? 8, 16, 32? Next question what does: What ...
0
votes
1answer
54 views

MPLAB X IDE on computer emulation / debugging how to set input values?

Is there any way I could emulate input into chip using the free emulator, when debugging my code to see if it responds correctly into input?
0
votes
3answers
92 views

Is it Electrically Correct to Direct Driving Seven Segment in Multiplexed Manner?

I want to design a voltmeter with minimum no of components so the pcb becomes as small as possible.For this purpose i wish to direct drive the seven segment display. Considering the fact Typically ...
2
votes
2answers
70 views

How to Check Rechargeable Battery NiMH Status with Microcontroller?

I created a device, based on an Arduino Uno, which runs on 6 rechargeable NiMH batteries. Now I would like to add a check, if the batteries have enough power left, to warn with a signal when the ...
4
votes
2answers
99 views

What is the difference between context switching and interrupt handling?

I'm an embedded developer. I haven't worked with RTOS/linux. I was going through RTOS concepts when I stumbled upon 'context switching'. I understand that when context switch occurs, all the registers ...
0
votes
0answers
30 views

2 wire (Ground/Power/Data) for low power systems

I'm looking for suggestions on a low power system that provides power, data and ground over 2 wires. It also needs to support multi-drop and star network topologies. I've found HART, which is close, ...
0
votes
1answer
57 views

Different data type volatile unsigned int to const char ,

I have to reply via SMS the value of a variable if the password is sent to arduino by help of sim900. I am able to switch an led on successfully. Now I want the arduino to reply to me the variable ...
1
vote
1answer
57 views

Wiring an IC for VGA switcher

Original schematic: Here is the goal switch between two VGA outputs from one source VGA input. Parts list: 1 SPDT switch for switching between A or B video outputs. 2 CBT3244AD IC chips (here's ...
1
vote
1answer
41 views

picking the right Vgs th based on VOH and VOL

My microcontroller has a VOH min of 2.4V and a VOL max of 0.4V. How do I spec the right Vgs th for a transistor switch? At first I thought, aim for the middle and go 1.5V. But then I was thinking ...
0
votes
0answers
32 views

Controlling a wifi outlet with sensor parameters

I currently have a wireless temp sensor that I can monitor via phone or computer, however I'd like to connect this sensor to a wifi outlet that turns on an a/c or heater. In order to prevent internet ...