I want to send integer values from 1 arduino (nano) to to another arduino (mega2560).
arduino nano have accelerometer connected which continuously give integer values to it. I want to send it to arduno mega2560.
I have tried many tutorials but I cant pair them.
Also guide me about the pin 34, key pin etc matter. I dnt know how they are used.
I have two HC05 bluetooth modules. having 6 pins, one State and EN.
Please guide me through step by step how to automatically pair them when they power on.
its in my FINAL YEAR PROJECT so please help.
For more easy fork you need:
1. Two serial->USB converters
2. Two modules HC-05.
3. PC/Laptop
You need configure one module as master, another - as slave. And then pairing them. For this purpose better use modules connected to PC over USB->serial converter and terminal (TeraTerm, Putty, etc) for both modules.
Good and sufficient guides:
https://alselectro.wordpress.com/2014/10/21/bluetooth-hc05-how-to-pair-two-modules/
http://elasticsheep.com/2011/05/serial-bluetooth-module-masterslave-connection/
Related
I'm building a linux-based cashless device and trying to achieve communication with VMC in vending machines over UART directly without needing additional hardware adapter to convert between 8-bit and 9-bit frame data.
I'm only using the cashless device, no intention to connect any other peripheral to the VMC.
I read questions asked about this before, some of them stressed on the need to an adapter, others suggested possible hacks to achieve the 9-bit to 8-bit conversion, but still can't find a confirmed working and stable solution.
My question is, Is it possible (and reliable) to achieve this using a pure software solution? and how?
Thanks
Yes.
The 9th bit is a control bit. It will show if the data is to be interpreted as an address or as data. If you are communicating with one device and sending only data you want to strip the 9th bit out and only look at data frames. Check and see if it's always zero:
If controlBit = 0:
ProcessData(byte)
Else:
print("This is an address: " + byte)
EDIT:
Many people have reported that your connection will not be stable without special hardware due to timing problems.
Instead of reinventing the wheel you can use opensource code as a starting point.
https://github.com/mhaqs/vendiverse/wiki/Programming-the-VMC
This way you don't have to make the same mistakes over and over again.
I am a beginner to arduino and trying to follow one of the videos from youtube to make a project- Master And Slave using HC-05 modules. I followed every step from that video carefully. Here's the link to the video ->
https://www.youtube.com/watch?v=BXXAcFOTnBo
For Slave Module when I type AT commands in the serial monitor nothing shows up.
I searched in Internet for the this problem and still didn't fix it. Here's What i have done:
tired restarting my pc
tried Changing arduino, At first i used arduino nano and then uno
I tried changing the baud rate to all other values and nothing happened
And there is no change in light blink, it stays on AT command mode until power is turned off and on again.
This is how is looks
Thank You For the Answer
Your problem is not actually related to arduino in any way. This tutorial is utilizing onboard USB->UART transceiver IC. So in theory you could even remove Atmel chip from the board. Its more like using module like this FT232 converter. Anyways sorry if I confused you but you can research the subject.
But anyways to the problem. Couple of questions:
Did you press reset button on module while powerin up the circuit?
Thats the way it enters to AT command mode
Did you try to reverse RX-TX lines, don't worry connecting these guys across eatch other doesn't harm your board.
(They are so often plugged in wrong..)
Did you make sure you have connected EN pin of module also. (To arduino 3.3V not 5V)
Did you triple check all connections
Try to upload simple Sketch like blinky to Arduino to make sure you are connected to USB-UART transeiver and you have correct drivers.
Make sure you upload empty sketch or remove the chip when you try to apply tutorial steps.
Change jumper wires. Sometimes cheap jumper wires are really bad quality.
I have been sometimes scratching head for long time because of broken jumper cable.
Please let me know if you have checked all of those so we can think for next step.
I am developing an embedded solution using C and I am working with two USB sensors. If I connect each sensor alone they take this names:
Device 1 (I do not know why it takes 6 names...)
/dev/ttyACM0
/dev/ttyACM1
/dev/ttyACM2
/dev/ttyACM3
/dev/ttyACM4
/dev/ttyACM5
/dev/ttyACM6
Device 2
/dev/ttyACM0
So when I start as an embedded system and both sensors are connected, the fastest one takes /dev/ACM0 but it not always the same. So, when I try to read device 2 I could be reading device 1...
I think that It would be great to change the default names of the sensors. I guess that it is going to be possible but I do not find anything.
You should try using the names in /dev/serial/by-id instead, since those names include the name of the device and should not depend on the order of connection.
By the way, it is also possible to write udev rules that make symbolic links for the serial ports depending on what device they belong to. I am not sure how that would work for a composite device with 6 serial ports, but there probably is a way to make it work.
I bought a HM-15 BLE bluetooth module and successefully connected to Arduino. I am able to sent At commands and I would like to use it for scanning for iBeacons and get their major and minor.
Using AT+DISC? I can see the beacon address but I cannot connect to it and now I am stuck on how to retrieve major and minor
Can you help me? Here is the datasheet of the module:
http://www.elecrow.com/download/bluetooth40_en.pdf
Thanks
Bluetooth beacons do not require a connection and you read the identifiers directly from the advertisement.
Read section 19, Start a discovery scan, and learn how to read and decode the bytes in the discovered peripherals. The exact byte layout varies for different beacon types. For AltBeacon, an open source beacon variant, you can see the byte layout here: https://github.com/AltBeacon/spec
To decode a proprietary beacon format, you will need to learn how that beacon layout differs from the example linked above.
Old question, but just for the record, you can use AT-DISI?
This will scan for beacons, including iBeacons and also AltBeacons. The response from HM-10 will include RSSI for each.
PS: I'm assuming HM-15 and HM-10 operate the same way. Probably not exactly a fully reasonable assumption.
I'm using a Virtex 5 FPGA and want to have a few +5/0 I/O pins to communicate with a microcontroller. The only peripherials I've used on the board so far are pushbuttons and switches and no one I've asked seems to know the simplest way to do this I/O. I've looked around the board specification but haven't found any simple way of doing it. I would appreciate any advice you might have.
This is not an easy thing to do. If you don't have the schematic of the board, then you need to get volt meter with some fine pitch probes and reverse engineer the board.
It is pretty easy if you have 2 boards, with one board it can be really hard since the BGA signals may not be connected to a via and therefore not available on the bottom of the board, and even if they are, then you don't know exactly which pin they are connected to. But with some luck, you can find them since the VIA can only be connected to 4 possible pins surrounding it!
The first thing you need to do is to identify your chip, find the BGA print of the IC from Xilin'x web site.
If your board has some buttons already, then if you are lucky, those signals may be routed to the pins of the FPGA that are available on the bottom of your board. Here are the things you need to do:
Make sure you have good ESD protection to perform these test
Put your voltmeter into 'buzzer' mode
Check the pins of your connector and find out how it is connected, see if there is a pull-up and/or pull-down resistors on the board
when you find the 'active' pin of your connector, start connecting the other probe to the VIAs one by one
When you hear a buzz, make a note of the position (guess or measure the distance between the side of t he IC and the location of the via)
Identify the 4 possible pins that the signal can be connected to
Write a code to get all those 4 signals and connect them to ChipScope
In Chip Scope, capture all 4 signals and see which one is the one with the right connection!
alternative, you can create a design with inputs only, capture all the inputs and put them into a memory block and create a trigger logic to capture all the signals whenever any of the inputs changes, after lots of work and analysis, you will find the correct pins.
Anyway, these are just crazy ideas since this is a really difficult thing to do without having the PCB info of the board.
Good luck with your hacking.