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.
3
votes
2answers
48 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 ...
2
votes
2answers
31 views
Differential or Single-Ended ADC?
I'm getting to know the Freescale Kinetis L microcontroller. It's ADC has a lot of options, but long story short, it seems like I should be able to get 16-bit resolution in either single ended or ...
1
vote
0answers
38 views
Can I use a voltage divider circuit instead of a level shifter here?
I am trying to hook up an LCD module to my microcontroller, and was following this tutorial.
Notice that the three signal wires all go through a level shifter, which drops the voltage from 5V to the ...
0
votes
2answers
64 views
Building a 12 hour timer
So, i want to make a timer that will turn on/off a circuit. I want to turn on the connected device at 08:00 and stop it at 20:00, so the interval is 12 hours. Correct me if i'm wrong but i can't use ...
0
votes
0answers
39 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
44 views
Context Information Saving on microcontrollers?
I make a search for context information saving method in microcontrollers (especially PIC), and the only thing i found is a patent of the "tamper resistant microprocessor". According to the patent a ...
0
votes
1answer
38 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 ...
2
votes
2answers
63 views
PIC16F877A (with LCD) not working
I have designed a PIC18F877A micro controller project to read temperature from an LM35 using ADC, display it on an LCD and transmit it to a serial port.
When the program starts, sometimes it shows a ...
-5
votes
0answers
45 views
Intelligent Lockers And Components [closed]
I hope some of you guys have heard about Amazon Locker ( Its a locker mostly used by ecommerce sites to deliver goods to their customers. The customers enter a PIN on a screen and the locker will ...
-3
votes
0answers
24 views
Audio/Video streaming using AT32UC3B0256 [closed]
Need Help regarding my project.
I've bought a LinkSprite JPEG Color Camera TTL Interface with JPEG Compression. Details HERE!
This camera do all the image processing and compression at its end. What ...
3
votes
2answers
64 views
Designing a Low Power wireless temperature transmitter
I'm going to work on a project in which I need to take your experienced into consideration to which path should I go to. I need to design a wireless circuit at max size 5*2CM, that has a thermostat, ...
2
votes
3answers
107 views
Why pic18fxxx microcontrollers is better for C language
Pic18fxxx family has a lot advantages and improvements from the pic16fxxx family of microcontrollers. What is the particular feature that make them better for C programming than the pic16fxxx devices? ...
-7
votes
0answers
42 views
Anyone here mcu decryption know? [closed]
Anyone here mcu decryption know?Encryption mcu program data is read out, you can copy to any blank inside mcu. Function is exactly the same, which means copy.For example MSP430F PIC AVR all can be ...
2
votes
2answers
113 views
Minimization of electrical noise?
I read a textbook and it states that:
"The effects of electrical noise can be minimized using circuitry external to the MCU"
I don't understand how this scenario works. What does it mean with ...
5
votes
2answers
68 views
Save energy with PIC project
I want to implement a device with 2 push buttons. When I press the first button, it will increment a counter. When I press the second, the number of times the first one was pressed (counter content) ...
0
votes
1answer
48 views
RE: USART @115200 on PIC18 explorer (PIC18F8722)
I have tried to initialise UART1 and communicate with a PC with no success @115200, as the SPRTG register, which needs to be 4.4253, cannot be so without introducing a large error.
The board has ...
-1
votes
3answers
82 views
Information delivery through zigbee
I am doing a project in which i have to measure the voltages of a given terminal and send it to other distant system through zigbee. My work plan is like this: I will use an arduino board and measure ...
12
votes
8answers
556 views
Microcontroller/cpu for fast trigonometry in robot?
This concerns hardware that does weighs little, because a (fat cat sized, 6 legs with 3 DOF) walking robot should carry it around. Because of that walking it'll need to do a lot of trigonometry (using ...
3
votes
2answers
55 views
Communicating via USART with an AVR - Input Buffer?
I am currently building a robot (as some of you may know from my previous questions). The current task I a dealing with is that of communication. To keep things simple, assume I have 5 commands to ...
4
votes
1answer
95 views
Wiring an illuminated toggle switch
I'm trying to build a model rocket launcher circuit. So far I have
this
The igniter requires 12V and 3A, BAT1 is 12.6V 9800mAh.
The arduino input pin should read HIGH when the igniter is connected ...
-1
votes
1answer
88 views
Is there any Real time clock (RTC) which provides time resolution in microseconds?
I've been searching for high precision RTCs on Google but almost all RTCs like DS12C887, DS1307 provide time resolution in seconds which is ok for general use. But is there any RTC IC which can ...
2
votes
6answers
89 views
Carrying out multiple synchronous tasks with a micrcontroller
I am making a robot which has several mechanisms on board. To keep things simple, let us say it has 2 DC motors, and 2 servos. Most of the time, the servos are not doing anything, and the 2 DC motors ...
1
vote
1answer
54 views
Maximum LEDs on a matrix
There are several methods to drive LEDs using a microcontroller. The easiest method is just connecting all LEDs to an own pin on the microcontroller. Say you have \$n\$ pins available, you'll be able ...
0
votes
3answers
101 views
How to control 0 to 110 of AC with microntroller rms output of 0 to 5 v
Is it possible to control high current with small rms voltage?
UPDATE
Do you think that this is gonna work?
1
vote
3answers
62 views
L293D Question About Grounding
I am using the L293D to run two motors, and am controlling it via an ATmega328.
I am a bit confused about how grounding works. I was following this tutorial, and searched this question a lot, but am ...
0
votes
2answers
63 views
5v output to 3.3v?
I have a microcontroller and a Raspberry Pi, both running off of the same 5v supply, in parallel. The microcontroller has 4 5v output pins and the other is a Raspberry Pi, that can only accept inputs ...
0
votes
3answers
108 views
Is it generally possible to uniquely identify an individual MCU (for licensing purposes) (no MAC address available)
I am being asked to enhance the firmware installation program for an MCU (specifically, a Freescale MC9S12E64 - though I don't know if this matters).
The purpose of the enhanced installation is to ...
-4
votes
0answers
35 views
program a microprocessor or a controller that obtains the input from the camera [closed]
I'm in a situation to use the microprocessor or a controller to perform the following operation
I want to program a microprocessor or a controller that obtains the input from the camera and processes ...
-2
votes
3answers
249 views
How do you run a 5v MCU circuit on a 12v car battery?
My Archery club has asked me to design and build a Traffic Light system for shooting, but they want it to run on a 12v car battery as this is what our previous system ran on.
I'm going to make the ...
3
votes
2answers
102 views
Identify an IC Found in a Garage Door Opener
Inside a defunct garage door opener I found this IC:
I tried searching for 33192C with variations of 'datasheet' and such keywords, but I got routed to the usual datasheet farms who are happy to ...
1
vote
1answer
77 views
Apply PWM signal to PIN of a Microcontroller
I am using the MC9S08DZ60. I have been give a circuit diagram according to which i must program the micro-controller. I am using Code warrior with Processor Expert which allows me to initialize the ...
-1
votes
1answer
46 views
wireless communication for identification purposes [closed]
I am working on a project that requires me to have a microchip installed on an electronic device and can also be identified by a scanner. The electronic device may be a car, so I need
microchip ...
3
votes
1answer
101 views
What happens when you set a pin in the wrong direction?
All MCU's have digital pins, which you can configure to function as input or output.
When you set something to 'output' which is wired as an 'input', will there be any possibilities of short-circuits ...
-2
votes
1answer
70 views
DSP with ADC DAC SPDIF IO controlled with Microcontroller via USB
I'm looking for a board to process live music (sub-millisecond latency if possible). I'm thinking of a layout like the following:
So there are a few DACs and ADCs, S/PDIF inputs and outputs and a ...
1
vote
3answers
76 views
Microcontroller hanging during serial communication
I was working on a project in which microcontroller is communicating serially with computer.
Initially it works properly but after some duration (i.e 2-3 hours) microcontroller get hanged.
I think ...
5
votes
1answer
78 views
Wear leveling on a microcontroller's EEPROM
For example: The datasheet for ATtiny2313 (as do most Atmel AVR datasheets) states:
128 Bytes In-System Programmable EEPROM Endurance: 100,000 Write/Erase
Cycles
Imagine a program only ...
2
votes
2answers
94 views
Servo Controlled Potentiometer using Rotary Position Sensor
I need digitally controlled potentiometers but I want real pots and not a digital potentiometer chip because I want to integrate this with conventional relatively high voltage circuits like those you ...
1
vote
3answers
67 views
Is MC8051 is a microprocessor with some components on chip?
The 8051 microcontroller is a microprocessor with RAM, ROM, I/O ports, timers, and serial ports on chip.
Is that the correct distinction between a microprocessor and microcontroller?
1
vote
3answers
96 views
A syntax error in my C18 program code
I'm using the MPLAB IDE X v1.41 with C18 compiler to pragram a PIC18F45K20. My objective is to retrieve image data from a completely built image sensor board and display on the computer using the ...
4
votes
9answers
289 views
Microprocessors/Microcontrollers - Do registers have addresses?
My Embedded Systems professor keeps referring to the memory locations of registers as their respective "addresses". I'm confused by this; I was always under the impression that in any microprocessor, ...
1
vote
2answers
137 views
AVR GCC : Global / Static Array not getting initialized properly
Im having problem with global arrays in my C code. What i am trying to do is to use a display buffer (array of 8 uint8_t with each uint8_t representing a row) to light up the leds in 8x8 led matrix ...
0
votes
1answer
75 views
zigbee seies 2 (xbee model ) , zigbee + microcontroller
Does a zigbee series 2 ( xbee ) module have a inbuilt microcontroller? If yes, is it possible to reprogram that microcontroller? If not, then is it possible to use an external microcontroller.
2
votes
3answers
53 views
SSC-32, can I and how can i program it
A friend recently gave me this board that he had never used and didn't know anything about it. It had a USB to serial cable plugged into it with the driver software that I installed and it had a servo ...
3
votes
1answer
81 views
Multiple micro controllers to control LED matrix
I am planning to use 5 40 pin Picaxe micro-controllers to control a 70x70 LED board matrix. My plan is to use 4 of the micro-controllers to control the LEDs and the 5th to tell the other ...
2
votes
2answers
116 views
Microcontroller used to transmit video?
I need help choosing a microcontroller for a project I'm doing.
This microcontroller needs to do the following:
1) Interface with a low resolution camera, obtain video feed from it, compress it and ...
1
vote
1answer
43 views
Digital Circuit question - sensing input across power rails using a micro
In the Circuit shown below, I am trying to achieve the following (I know my circuit is not correct, it is an attempt).
Problem: WHen INPUT_N = 0V, the input to the microcontroller does not go low.
...
-1
votes
0answers
43 views
Is there any way to encode data transmitted wirelessly using 433Hz Tx/Rx pair
I am trying to find a way to get my 433Hz Rx/Tx modules to work with 2 AVRs but I cannot get anything useful out of them because they seem to pick up a lot of noise, and they seem to have weak signal ...
0
votes
0answers
57 views
Transmission via RF433Hz Transmitter/Receiver pair failing AVR
I am trying to send data wirelessly through a RF433Hz receiver/transmitter pair, but nothing seems to want to work.I want to the transmitter to continuously send a number (0x81) to the receiver when I ...
0
votes
2answers
56 views
Error in final launch sequence Failed for OpenOCD (Olimex) for ARM (STM32fxx)
I am using openOCD in eclipse for the arm STM32F10x series. After writing the whole code and building everything without error in the program, I am going to debug it and I am getting an error after ...
5
votes
1answer
115 views
Any disadvantages to single-supply mode?
I am using the ATMEL ARM SAM4S MCU for a project. It supports a single-supply mode where an internal voltage regulator provides the 1.08-1.32V necessary for VDDCORE and we need only provide 1.62-3.6V ...
