I am using an arduino Uno with SIM800L, I am trying to send voice at anyway while a voice call is active, and how do I receive voice too?
I have searched a lot, but found nothing. Even though, I have reference which contains most of the AT commands that are applicable on my SIM800L. For example, when I make a voice call with my phone and the SIM800L, how do I receive the voice data from the GSM when I talk through my phone?
The GSM I have is SIM800L version 2, note that version 2 is different from version 1. However, it turned out that there are no at commands to send voice while a voice call is active, you must use another pin, not directly from the at commands. SIM800L has only 7 pins which is low, this is a picture of it : https://i.imgur.com/yxS3Apy.jpg .
It does not have any pins for receiving and sending voice specialized for a voice call. So, you can answer a call and dial a number, but you can't hear or speak. So, all I can do is use another GSM that has the capability of receiving and sending voice.
However, if you would like to know if a GSM has the voice capability or not, you should find these couple of these pins or similar to them:
MCN (Microphone Negative)
MCP (Microphone Positive)
SPKN (Speaker Negative)
SPKP (Speaker Positive)
Search for SIM800C, which has these pins. You can also connect a basic speaker with an amplifier directly with the SPKN and SPKP, the amplifier is optional, but the sound will be too weak.
Related
I have developed a card with sim900 and ATmel, and it works very well, but when I changed sim900 for sim800 it did not recognize the sim card.
Difference in hardware design?
SIM800,SIM800C modem operates from 3.4V to 4.4V supply range (Reduced operating range !)
SIM900, SIM900A modules operate from 3.2V to 4.8V supply range.
SIM800 is having a Pin to connect with Bluetooth Antenna
Apart from these differences the hardware design is almost similar. The same hardware circuit can be used for the SIM IC if the generated supply is within 3.4V to 4.4V for both types..
I faced this issue before. I tried to contact SIMCOM but I didn't get any response.
My solution was to give to the modem a few seconds more time to boot, before I sent any commands to it.
Even if you get an ERROR as a response when you check for the SIM card you can insist on polling the same command until a predefined timeout time.
Also, note that not all of SIM800 have a Bluetooth feature.
Which country are you currently located? SIM900A works with Dual-Band 900/ 1800 MHz. I believe it was designed for US band while SIM800C is Quad-band 850/900/1800/1900MHz and may operate world wide.
Find out the bands used by your mobile service provider and use module compatible with the band.
Firstly, I'll just give you a brief introduction about our project... its "Speech controlled Home Automation System" where we are controlling the Home appliances by the voice or speech commands. We're successfully done with the voice recognition module. But our problem is with achieving the communication between the transmitter {where the user gives the voice command} and receiver {where the home appliances are present} through WiFi i.e. we have got 2 ESP8266 12E modules interfaced with Arduino both at the transmitter and receiver side and these two WiFi modules need to be communicated(To interchange some data sent by Arduinos).So please let us know which Arduino code need to be used at transmitter side wifi module and at Receiver side wifi module and also about the header files or additional softwares(if any)to be used.
you can achieve this by starting one of wifi modules in Access Point Mode and the other one has to be set to Station Mode in order to connect to the first one.
In case you want to add a router, just set both ESP8266 modules to Station Mode and connect them to the router.
And then transfer any data you want through AT commands of ESP8266.
Here is the refrence to them.
https://room-15.github.io/blog/2015/03/26/esp8266-at-command-reference/
If you are newbie to Esp8266 and Arduino , this will help you.
http://www.teomaragakis.com/hardware/electronics/how-to-connect-an-esp8266-to-an-arduino-uno/
Good Luck !
I worked on a similar system a year ago. I was developing a remote controlled toy. My main difference was I used the ESP8266 without an Arduino attached.
One ESP worked as a a WiFi hotspot and the other connected to it, sending messages through UDP.
For some reason, I could not get the two ESP modules to connect (I think it was a problem with the board I had), but I sent messages from my computer, and it worked out fine. I will not burden you with all of the code, but here is the GitHub link.
All that needs to happen is they will be on the same WiFi network, and then you can use the ESP8266 WiFi library to send messages between the two. Like I said above, I used UDP, which is good for high speed, with no error checking. But there is also TCP (higher up, has error checking code), or you can use the server/client part of the library to set up a full web server and read/write data to it. Without knowing what type of data, I cannot comment on what would be the best method.
As for headers, you will need WiFi.h, and if you are using UDP you will need WiFiUdp.h
You should not need any external software besides the Arduino IDE.
I taught myself from scratch for this product, using two main resources: the Arduino library reference, and the docs on the ESP8266 Arduino GitHub page
I am new to Arduino and I would like to do a project that sends data, remotely. So, the Arduino would not be connected to Wifi/Bluetooth, Ethernet, etc. Would using a GSM shield be the best way to transfer data? I do not need to make phone calls or send SMS (unless sending SMS would be a better, more reliable, option) just data to a server, who's app I would create. If this is the best option, what else would I need to make this happen? For example, on top of the GSM shield (I am looking at something cheap like this: https://www.amazon.com/Geeetech-SIMCOM-Quad-band-Development-Arduino/dp/B00A8DDYB6/ref=sr_1_2?ie=UTF8&qid=1467651878&sr=8-2&keywords=Arduino+GSM+Shield) what other charges would I need to pay? I.E. would I also need to get another phone plan? Would I have to pay for a gateway service that would receive the cell phone data and then send it to my server?
Thanks your any thoughts on this
Wifi, ethernet or GSM, it depends on what you want to use, and what you have.
With all three you can send data to a server.
There is a bench of Arduino shields. All shields from Arduino come with a library to handle communication.
Other shields from other vendors exist and they provide their libraries too.
For Ethernet you can check the arduino shield https://www.arduino.cc/en/Main/ArduinoBoardEthernet.
For Wifi there are plenty. You have first the arduino shield. You can also take a look at the CC3000. Or the famous ESP8266. For all three you can find libraries.
For GSM, Arduino has a shield and a library. Arduino uses the Quectel M10 GSM moduel. You can find lots of examples in the arduino website and all over the net (https://www.arduino.cc/en/Guide/ArduinoGSMShield).
There exist other shields like the one you mentioned. Libraries does exist for those "other" shields however they are not as maintained as the arduino one.
You need to be careful though, you'll find over Amazon (and most likely on Alibaba) some GSM modules like SIM900A that are way cheaper, those are only dual band and will work only on certain contries.
There is another cheap GSM Module called the A6. It was made by espressif the company behid the ESP8266. It's relatively new and no library exist for it at the time. You can write you own functions to use it, but that would be some extra work.
In all cases, to use a GSM module you'll need a sim card with it's phone plan and all.
Another thing to consider is how to power these shields. They use more power than an Arduino can generate (A GSM modules datasheet recommend to use a power supply that can deliver up to 2A). If you power them straight from the Arduino, you may encounter some strange behaviour.
So the ideal way is to have for them an external power supply with the required amps and have a commun ground with the Arduino.
I am using an HM-10 module and Arduino UNO.
My requirement is to read data from ibeacons near me using Arduino. Is it possible? I have not been able to find any articles on this. All articles talk about connecting your android phone with arduino. Any idea?
Yes, it is possible. I'm using an HM-10 as an iBeacon detector (linksprite.com BLE 4.0 shield), and it is successfully detecting a RadBeacon running in iBeacon mode. Firmware on my HM-10 is version 540.
Before it would detect the RadBeacon, I had to send the HM-10 the following commands:
AT+ROLE1
AT+IMME1
AT+RESET
Then I used the AT-DISI? command, and the serial monitor is showing the broadcast received from the RadBeacon (and one other beacon) as follows (for example):
OK+DISISOK+DISC:4C000215:2G234454CF6D5A0FADF2F4911BA9FFA7:00000001AC:0CF3EE041CCE:-052OK+DISC:00000000:00000000000000000000000000000000:0000000000:B9782E08068C:-071OK+DISCE
In this example, the HM-10 is detecting my RadBeacon which has UUID of 2G234454...with signal strength of -052. It is also detecting another BLE beacon (my AppleTV downstairs) with UUID of B9782E08068C with signal strength of -071.
I'm definitely not very knowledgable about any of this stuff, but it seems to be working for me so far. Next challenge for me will be to figure out how to parse the text data being received. I'm mostly interested in the distance/signal strength data in order to trigger an action when the RadBeacon gets very close to the HM-10.
[Full disclosure: I jumbled some of the UUID numbers above since I'm not sure if any of this information is private or hackable or whatever]
[By the way, the nRF8001 BLE Shield will not do this since it only runs in peripheral mode.]
Yes, you can get the Min and Max number of the nearby iBeacons.
You need to Attach hm-10 to Arduino Uno.
Try using this Library : https://github.com/dinosd/BLE_PROXIMITY
You can configure suitable AT commands if you want to configure it. But it should work with default settings as well.
Use SoftwareSerial to access HM-10.
In firmware version V539 of the HM-10, it adds an AT command to list nearby iBeacons. The command is AT+DISI?. You would simply need to set up the Arduion to send that command over a serial port and parse the data it returns.
I would like to use a GSM modem to make a voice call to a phone number, play a recorded message, wait for a digit to be pressed and then disconnect the call. The system needs to know if the line was busy, if the user answered and which digit was pressed by user (if any). It should drop the line if nothing is pressed in 30 seconds. If user presses the digit before the question is completed then the voice should stop (user doesn't have to wait). Also, it would be nice if system could handle invalid digits (play "invalid digit" message, play original message and wait for input). Multiple calls in parallel would be nice, but I guess this is not possible?
I have found this article which explains low-level interface quite nicely. However, this question is more pragmatic - which libraries and which GSM modem would you recommend? OS is Linux, modem can be either RS232 or USB. I would prefer Python, but C(++) is ok too.
BTW: this is not telemarketing, it is a notification system. Not that it matters... ;)
EDIT: I learned this system is known by keyword "IVR" (added for future searchers).
A modem is generally used for data transmission but it sounds like you are actually transmitting voice, albeit prerecorded voice, and tones.
Although you can achieve this with the extra voice capability of a voice modem as you have identified, it might actually be easier to use a GSM to VoIP gateway, unless you actually need the modems data capability for some reason.
You could connect the VoIP to GSM gateway to a low cost or free open source PABX (such as Asterisk) and use this to build your particular application.
Some gateways even support multiple SIMS so you can target the SIM which gives the lowest call rate for the number you are calling - for example if you know that the number you want to call is on a particular operator, then that operator may offer free 'on network' calls between it's SIMs. This might be an advantage if you are expecting to make a large number of calls.
If you do a web search for 'VoIP GSM gateways' you will find some examples.
The following link provides an overview also:
http://www.voip-info.org/wiki/view/VOIP+GSM+Gateways
I am no expert in this field but it is something of a personal project that I have wanted to dive into.
Here is what I think will be the best way to do this.
1 Get yourself a VOIP GSM Gateway like this: VOIP+GSM+Gateways
2 Link into an existing PABX system or download a free one like asterisk
Then you will need to follow the instructions of the PABX development to create your dial plans and routing. I don't know if there are any already out there but I'm sure you will find many examples of the bits and pieces you need.