Questions tagged [mbed]

mbed is an operating system and hardware abstraction layer for microcontrollers, developed by ARM. A large number of development boards are supported.

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Using the STM32 Nucleo L152RE with uVision

I've been messing around with the Nucleo with mbed for the last week or so, but I'm keen to get out of that and back into some lower level C to give me more flexbility. I have the problem, however, ...
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2answers
673 views

FRDM-kl25z Serial Buffer Issue

I'm sending data over Serial to a FRDM-kl25z via a printf statement on another uC; ...
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1answer
979 views

Is 3 bytes a min to address a register in a 256K EEPROM?

I am really new to electronics and embeds and I am struggling with some probably basic notions. (I have a software background.) I have an EEPROM (24LC256) connected to an MBED microcontroller and I ...
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1answer
1k views

Can I connect the ST Nucleo-F334R8 board using CAN (Controller Area Network)?

I have the ST Nucleo F334R8 board (64 pin version/LQFP64). The datasheet of its microcontroller (STM32F334R8T6), which is advertised as having one CAN interface - the 2.0 B Active type says this ...
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4answers
1k views

Shift Register Counter

I am working on a project with my MBED microcontroller and I'm running into some snags, because I'm new to it and getting myself confused with how exactly everything works. I have my MBED hooked up ...
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2answers
408 views

Question about communication using a controller area network (CAN)

I am trying to make a test CAN loop on a breadboard and I want to try reading and writing to it using an mbed. I found an example circuit and some test code for reading and writing from a CAN loop ...
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2answers
2k views

How to read RCA output from an mbed?

I'm wanting to buy this IR camera but it says it has RCA output. Is it possible to read this into an mbed without external components(aside from a 12v power source)? If so, how?
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1answer
289 views

2-Way communication down 1 Wire

I have 2 wireless modules connected to mbed micro-controllers by serial and they can communicate fine, however the data transfer is one direction at a time (like transmitting down 1 wire). I need to ...
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1answer
946 views

Why doesn't mbed talk to my computer?

I downloaded the driver to connect to mbed via USB. I flashed a serial communications example program on the mbed board. I've connected to it via Tera Term, at 9600 baud, 1 stop bit, no parity, and 8 ...
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1answer
2k views

Using MBED PWM for motor control

I have an mbed project with firmware that controls some PwmOut switches. All works fine firmware opens and closes switches as expected. I tested this with a LED (...
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1answer
3k views

mbed vs Teensy 3 vs other options [closed]

I'm an electrical/electronic technician, I'm good with analog electrical stuff & electronics, but when it comes to microcontrollers, programming & uA, stuff start to sound Chinese to me (no ...
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1answer
367 views

MM5451 (LED Driver) basics - trouble lighting LEDs

I'm using an mbed micro controller to switch on all channels on the mm5451 LED driver. I have wired accordingly with 5v PSU, 1k resistor on pin 19 for brightness control (have varied this with no ...
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1answer
424 views

mbed midi controller feasibility

I'm looking to start on my first microcontroller project-- a midi controller that (hopefully) will connect to an android device via ADK as part of a touch interface. I've never worked with this lower ...
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184 views

Should one use resistors to protect an mbed when using it to simulate keyboard key presses

One can use mbed to act as USB Host or as a USB Device. One use of the latter is to have it emulate a USB Keyboard by sending normal key presses. The general page on using mbed as a USB Device is in ...
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3answers
2k views

Stepper Motors (on mbed, not arduino)

There is some information on chiphacker about using an arduino to control stepper motors (I'm driving Bipolar, 4 wire, motors), however I'm finding it hard to know how to control a stepper motor using ...
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443 views

MBED Controller Module Datasheet and Pin Details

I want to connect the output pins of NXP MBED controller to 16 electromechanical relays,and 32 LEDs,what is the best way to do this?The relay would require a current of at least 300mA and LED would be ...
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2answers
1k views

Are pull-down resistors included in the mbed USB ports?

For the mbed LPC 1768, I am trying to establish a USB connection with an external device (pins 31, 32, and 39 for D+, D-, and Vbus, respectively). According to USB in a NutShell: Connectors, a 15kΩ ...
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5answers
1k views

mbed as a programmer

For those of you that haven't heard of the mbed I'd highly recommend having a look at it for rapid prototyping! So, the mbed is a 100MHz microprocessor that appears as a usb mass storage device when ...
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250 views

How to write data to this dataflash memory

I'm trying to write data to a W25P80 dataflash memory using an mbed. The documentation says there is a read data instruction for reading data from a section of memory by sending the opcode 03h ...
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1answer
9k views

Inverting the input and output of a UART

I'm talking to a sensor using RS232 and the UART of an mbed. However I've noticed that the bits sent to and from the sensor are the exact complement of what they should be. What my mbed sees as a 1, ...
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2k views

What makes a particular platform suitable or unsuitable for production use? [closed]

Let's assume that the cost of goods is an insignificant factor. If a company lacks a team to produce a custom board for a particular product, but has success with an off-the shelf development ...
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3answers
297 views

This flash memory works without connection to a power source or gnd?

I am doing a project where I need to store information into flash memory and read it back using an mbed. I can't get it to work right, but I noticed that even if there is no connection to power or ...
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1answer
327 views

Can an mbed device be damaged by something drawing too much current?

The mbed has a pin which supplies 3.3V regulated current. I think it can supply up to 100mA. If this pin is used to power a device, and the device tries to draw 150mA, then what can happen? Is the ...
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1answer
7k views

How to read the device ID of a dataflash memory

I am trying to read the device ID of a serial flash memory by using the SPI connections on an mbed. In the datasheet for the serial flash memory W25Q80 there is this figure. The following is the code ...
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2answers
572 views

How to make an mbed print text from ascii codes

I want to send Ascii codes to an mbed and have it print Ascii characters which can be seen from Hyperterminal. How can this be done? I looked at the mbed website and found nothing about keyboard input ...
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5answers
1k views

Does reset do the same thing as shutting off the power to this device and turning it back on?

I am trying to control a serial dataflash memory through an mbed. It is an AT45DB021B and the datasheet is here. It has a reset pin that I have wired to the mbed so that a software reset can be done. ...
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568 views

Can the frequency of the SPI sck on an mbed be adjusted?

I'm trying to control a serial dataflash memory through the SPI interface of an mbed. SCK from the mbed is connected to CLK of the dataflash memory. I'm not sure, but I'm starting to suspect that this ...
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1answer
472 views

How should I debug my mbed project?

I'm using an external power source to power an MBED module. I have the UART transfer and receive ports connected to a MAX232 level switcher in order to make the signals compatible with RS232. From ...
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1answer
201 views

Using a laptop to communicate with an MBED module

I'm using an external power source to power an MBED module. I have the UART transfer and receive ports connected to a MAX232 level switcher in order to make the signals compatible with RS232. From ...
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2answers
501 views

Having some issues with RFID reader

I just received an RFID reader from Parallax (#28440) to play with, and am having some problems getting it to send me data. I'm interfacing it with the mbed microcontroller that I also just received. ...
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2answers
981 views

How to connect mbed to computer

How do I connect my mbed NXP LPC1768 to my computer. I have a USB cable and a breadboard. What else do I need? What connections do I need to make?

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