Wireless Device to phone Inquiry  - Page 1
Forum section: electronics / beginners

author: dleebell
author_rank: Contributor
timestamp: March 11, 2015, 10:09:38 am
content: HiI'm just curious if there is some kind of wireless system such as Bluetooth, Radio Frequency that allows a phone to connect to another device (not a phone), with a range of about 100m. I've found that Walkie-talkies are unable to connect to a phone. And Bluetooth is too short a range (~10m)that I am looking for.Is there any other wireless system that I am missing or a way of adjusting RF or bluetooth to work with what I have mentioned? (I do not want to use wireless internet).Many Thanks

author: tszaboo
author_rank: Super Contributor
timestamp: March 11, 2015, 10:43:01 am
content: GSM.

author: dleebell
author_rank: Contributor
timestamp: March 11, 2015, 11:45:24 am
content: Great thanks. Although I'm guessing this is a service where you have to pay? Preferably I would like something that has free channels like RF.

author: Wilksey
author_rank: Super Contributor
timestamp: March 11, 2015, 01:10:10 pm
content: Note sure the distance of BLE or WiFi on a phone?But yeah, the only other way on a phone apart from the aforementioned is GSM.

author: miguelvp
author_rank: Super Contributor
timestamp: March 12, 2015, 05:03:14 am
content: Quote from: dleebell on March 11, 2015, 10:09:38 amIt will take some doing (or as they say now making) but it should be possible to do.For example, have 4 walkie talkies one transmits on channel A another receives on channel A, the third one transmits on channel B and the last one receives on channel B.Now you need something that allows voice detection and some buffering that allow time for the transmitter to engage, the receivers are always on.The channel B receiver hooks into the phone microphone, the channel A transmitter hooks into the phone speaker, you also need some MCU with 2 ADCs and 2 DACs and buffers and logic that takes the phone off hook and can trigger the hang up. Dialing via DTMF (touch tone). The MCU also controls the channel A transmitter when voice is detected from the phone. For dialing. The MCU should also detect ringing and transmit it via some not normally used DTMF sequence that the remote system can interpret to ring the receiver.On the remote system, you need a phone handset and wire the speaker via a ADC/Buffer/DAC controlled by an MCU that will detect voice to transmit on the channel B transmitter... well you get where this is going.More complicated using only one pair of walkies. short transmissions and larger buffering and synchornization between receiving and transmitting periods, more complicated controls to use the tallkies as the transport. This might require to use some binary protocol (kind of like a modem) between the two stations.Anyways, you can use walkie talkies but it's going to take some design and work. You can substitute the walkies with RF transmitters and receiver in the same fashion using two channels, but the problem will be what frequencies to use.

author: pickle9000
author_rank: Super Contributor
timestamp: March 12, 2015, 05:23:56 am
content: How much data do you want to move?Walkie talkie frequency?

author: katzohki
author_rank: Frequent Contributor
timestamp: March 12, 2015, 09:59:18 pm
content: Walkie Talkies can connect to a phone via what's called a phone-patch:http://en.wikipedia.org/wiki/AutopatchIs that what you need? You'd probably have to have an amateur radio license, which isn't too hard.