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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39 views

How can i dim the lamp using triac and arduino [on hold]

I have seen many blogs but I can't find out the correct way and circuit to do so. If you know it then please give me the proper explanation of the circuit, the things used and name the materials ...
1
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1answer
62 views

C# & CCS File Transfer

I need to send/receive files from/to SerialPort and MSP430F5438A, by clicking a browse button in C# interface, selecting a file (like text, notepad, etc.), and in receive case, to save the file which ...
0
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0answers
29 views

ELAN microcontroller programming

I am new to ELAN microcontrollers , I am trying to program EM78P156N using UWTR from ELAN. I am facing problems as I do not know the correct procedure to program ELAN controllers. Can anybody please ...
0
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0answers
74 views

Can't identify chip [on hold]

I've done extensive research trying to figure out what the original use was for a series of small RCA chips. They are approximately 1x3" and marked XEX1 and a 9 digit number on the left. I have looked ...
1
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2answers
72 views

Variable Voltage Using PWM and Low Pass Filter

I am trying to control a steady DC output voltage using a Micro controller with a PWM duty cycle. With the current schematic, the Voltage on Vout is pulsing along ...
1
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0answers
23 views

AVR: Usage of Force Output Compare bits

Currently I'm dealing with Tiny2313 for my project. Timer runs in CTC (WGM12) mode so OCR1A is used to set TOP of the timer. I want to use OCR1B to generate output signal. In documentation is ...
0
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0answers
49 views

USB Audio Stream to Codec

I have been trying to design a USB Audio Interface with an Atmel SAM3U microcontroller and I think I have hit a wall in my thinking process. As a sidenote, I'm relatively new to the world of ...
0
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2answers
135 views

How do I make multiple connections to a microcontroller's GND/VCC etc?

If I'm hanging a number of switches and potentiometers and other sensors off a single microcontroller, I need to connect multiple wires to the µc's ground and VCC pins. What's the best way to do ...
0
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0answers
28 views

Automatically changing currently used and charged deep cycle batteries, any problem?

I don't know the internals of commercial solar deep cycle battery chargers, though mostly what I see in home made ones is that a regulator circuit is connected to battery, and when you want to use the ...
1
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1answer
127 views

Vcc pin of 8051

I have tried to simulate a micro controller based project in Proteus, but I cannot see a Vcc pin of the 8051 micro controller. Is it inbuilt or something? I am using Atmel at89c51.
0
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2answers
57 views

5v tolerance on 3.3v PIC

Many PIC microcontrollers such as PIC24EP512GU810 have 5V tolerant pins. My question is how does this work. Do these devices have clamping diodes for ESD protection? Would clamping the input voltage ...
0
votes
1answer
33 views

Plug-and-play usb-midi controller. How?

I am wondering how plug-and-play usb-midi controllers are created? To the moment I've created a simple midi controller based on Arduino Uno, but I am not able to use it directly. I have to use ...
3
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3answers
152 views

Why Atmega328P has no PortA

This is a general question regarding Atmega328P. While I was reading the datasheet of Atmega328P, I see that it has Ports B, C, and D. So, I'm surprised to see that there is no PortA. Is there a ...
2
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3answers
102 views

'reserved for future' bits in microcontrollers

Why some bits in microcontroller registers are marked as reserved or for future pupose? I have seen some address spaces also ...
0
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3answers
69 views

How to do a specific task after some time

I have to switch on one relay after some specific time, but at same time I have to do continuous polling for controlling other relays, I am already using interrupt for multiplexing purpose (7 segment ...
0
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0answers
69 views

Selfbuilt USB-JTAG programmer for FPGA's [closed]

I want to program an FPGA (XILINX Spartan III), with USB port of my laptop, and I want to design the programming circuit myself (not using the XILINX's cable). So, I want to build a USB-JTAG ...
1
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3answers
62 views

what is the difference in u-controller processor sampling frequency and the z-domain conversion sampling frequency?

I have observed a bit confusing behavior of my system response (or may be i am missing something). I have a transfer function in S domain converted to Z domain with a 1kHz sampling frequency at the ...
0
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1answer
69 views

problem with LED Matrix circuit

I want to create a LED Matrix circuit with 74HC595 shift register and 2n7000 mosfet. The schematic is as follows. I have mentioned voltage levels at various points. All the control signals of ...
0
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1answer
28 views

How to Prevent continuous switching fluctuation?

I am designing a digital stabilizer ,I am using ADC feature of Micro controller to sense incoming voltage and processing output through an AUTO Transformer .The code is like ...
3
votes
1answer
47 views

how to select capacitor for a crystal oscillator

Here is a 32 MHz crystal from one of TI's reference design The BOM list defines the crystal as ...
0
votes
1answer
60 views

Best way to transmit data and audio wirelessly? [closed]

i am new to electronics, but i know basics. I have little problem, i want make small, cheap, wireless, power efficient device which receives audio (mono) and transmits/receives simple data (like ...
0
votes
1answer
64 views

Displaying different Data on 7 segment

I am Designing a Digital Stabilizer ,where I have to Use a Multiplexed 7 segment Display to Show Input Voltage & Output Voltage ,I have successfully able to see input voltage but I am unable to ...
1
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1answer
53 views

How many inputs can a single mcu output drive?

I am planning a project that will have many ATTiny chips connected together. The idea is that a master node will send various control signals that every slave node will listen to. My system could ...
1
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1answer
54 views

How much humidity can a microcontroller/embedded device withstand?

I'm working on a project that employs a microcontroller in an 80-85°F environment with quite a bit of humidity. It's going to be placed directly next to an array of fish tanks. Obviously, the water ...
0
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2answers
53 views

Clamping Voltage without disturbing the power supply

I am using a circuit similar to the following, to clamp the input to my microcontroller to around 5 volts: How do I make sure that the (5V) power supply is not disturbed and stays regulated. I am ...
2
votes
1answer
35 views

Upload XBee firmware without a PC and XCTU

So, as the title suggests, I would like to know if there is a way of uploading a firmware to a XBee module, throug the serial without a PC. What I mean is, I have a microcontroller, I would have the ...
4
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2answers
197 views

Cascading several SPI devices

Is it possible to cascade several different ICs on the same data line, in order to use less CS pins, by tying the digital output of each to the digital input of the next? I am familiar with this ...
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2answers
92 views

Controlling a Stepper-Motor with 2 H-bridges

I think that I may have come up with a possible way to control a bipolar stepper motor using 2 simple H-bridges. The idea is to control the direction and the steps of the motor by switching the ...
2
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2answers
64 views

How to put a 74HC165 on an SPI bus?

If I want to read a (bunch of) 74HC165 chip(s) over an SPI port on a microcontroller, this is simple enough. Connect them through Q7 to DS on each, apply the final Q7 to MISO, notCE to SS and CP to ...
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3answers
129 views

Driving 60 signals one at a time, in constant sequence

I have an application where I need to turn on/off one of 60 signals one after another in a constant order, ever repeating. (1, 2, 3, ... 59, 60, 1, 2, ...) Only one signal is on at any given time. The ...
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1answer
94 views

keyboard and mouse interface

How do I interface a microcontroller with PC USB so that I can imitate the keystrokes and movement of keyboard and mouse. I've heard of software fixes, but is there any IC which can mimic the ...
1
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1answer
71 views

USART communication problem on PIC18F6722

I am trying to use enable USART communication on a PIC18F6722 microcontroller. More specifically enable the receiver and attach a receive interrupt to it. The datasheet describes the relevant bits ...
1
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0answers
18 views

CS42L52 output PCM?

I have an MCU connected to a CS42L52 codec over I2S and am able to input and output sound with no problems. When I pass the input from the codec, through the MCU, and back to the codec for output, ...
1
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2answers
53 views

watchdog timer operation

I have read that watchdog timer pushes microprocessor/controller into reset state whenever it experiences any software anomaly like executing in infinite loop. and after some time a very senior prof ...
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2answers
114 views

Why do TI (Texas Instruments) graphing calculators not use TI chips? [closed]

Most semiconductor manufacturers seem particular about using their own products when possible. For example, the Analog Devices Blackfin development board uses another Blackfin processor for the JTAG ...
0
votes
1answer
74 views

Are there any commodity cameras with a builtin programmable processor? [closed]

I'm trying to build a computer vision system with the smallest possible size, and with > 3 mpixels resolution. So, I'm wondering are there any commodity cameras with a builtin programmable processor? ...
1
vote
1answer
27 views

LPC11C24 MCU to control DAC8718

I am trying to use an LPC11C24 microcontroller to send digital values to a DAC8718 to convert to an analog voltage value. I am attempting to communicate via SPI and I am using ...
2
votes
1answer
65 views

PIC12 TRIS Register not setting, No GP0 GP2 output

I originally asked the this question on Stack Overflow. I think here would have been a better audience. I'm trying to program a PIC12C508A to do a simple LED learning circuit. I've read some ...
0
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3answers
137 views

What exactly is a microcontroller?

Can an optical mouse sensor chip (System On Chip) which has a digital signal processor, Serial I/O, and a set of registers be considered as a Micro-controller?
0
votes
0answers
23 views

How to interface SED 1335 F0A LCD controller to LPC 2148?

I'm trying to interface a 320x240 Text/Graphics LCD module to an ARM microcontroller-LPC 2148. The LCD controller is SED 1335 F0A by EPSON. The LPC 2148 is mounted on a Keil Evaluation Board-MCB 2140. ...
0
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2answers
78 views

How to drive miniature incandescent light bulbs with a micro controller?

I have an assortment of minuature (~2.5mm diameter) light bulbs that I'd like to use for a retro-looking project. Driving LEDs is fairly easy with a micro controller, if the output is too weak, I'd ...
1
vote
2answers
60 views

Bluetooth module (BLE112) USART: do I need to use its own microcontroller?

I am looking into the this module. All I need it for in my design is USART connection to my MCU (TX/RX connections). I don't care for the internal microcontroller (yet). My question: if I connect, ...
0
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0answers
23 views

Timing Issues When Interfacing with E28F800 Flash Chip

I'm trying to interface with an E28F800 via an Arduino Mega and am having trouble trying to program it. I'm successful in reading off the chip by toggling CE# & OE# while asserting an address, but ...
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0answers
41 views

Finding a Hydraulic Actuator to be controlled through a MCU [migrated]

I'm researching potential actuators I can use on a project i'm doing. I'm designing a creeper (platform for rolling under vehicles) that can lift you up just like the operation of those hospital beds. ...
0
votes
0answers
14 views

uC MPC5646CRM Interrupt source address

I am using an Embedded development software that needs the address of ISR in order to perform Interrupt. I am using MPC5646CRM Micro-Controller. The datasheet tells about the calculation of address. ...
1
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4answers
106 views

Is it possible to run PIC16F88 at 3V?

I have notice that PICs have the 16F88 and 16LF88 version, after some researching i tought the LF is for chips that work at 3.3V, in other places it says i can still use the 16F88 at 3.3V, the ...
0
votes
2answers
45 views

Connecting jumper to input pin

I am designing an active high function in my MCU program and I need a jumper to activate/deactivate the function by placing it between Vcc and one input pin of the MCU. I have came up with two ...
2
votes
1answer
88 views

Drive a 4.8V servo signal line using 3.3V

I have a servo with an operating voltage of 4.8V. I want to drive the servo from a MCU running on 3.3V. I haven't tried it yet, but was wondering if I needed to drive the signal line to 4.8V using a ...
1
vote
1answer
59 views

MPU accessing busy memory

I didn't know whether to place this question here or on stackoverflow, but I finally decided to post it here. I want to build a simple system that would be able to work with basic peripherals (UART, ...
6
votes
6answers
806 views

What's the maximum number of outputs you can control from a microcontroller with n outputs?

Been pondering this for a while, and I think it's \$2^{(n-1)}\$ outputs. If I have 5 outputs, I'll use 1 as the signal, and the other 4 as control lines to cascaded decoders, which gets me 16 ...