| Electronics > Beginners |
| Need help turning old payphone into dial-an-mp3 display |
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| Beamin:
--- Quote from: ez24 on September 06, 2017, 04:37:33 am --- --- Quote from: Beamin on September 06, 2017, 04:25:38 am ---... the handset which maybe sealed.. --- End quote --- If you can hire 200 PhDs like Google (for health apps for their watch) , use the handset for health diagnostics. Like BP. If you go KS say it will detect cancer (there is a lot of BS there). Use it to determine the health of your patients. Seems like a good product for a doctors office. Patients would have fun with it. --- End quote --- The Kick starter site measures brain activity. The higher the water seere gets in dollars the lower the brain activity of the donors. |
| rstofer:
It seems to me that the requirement for 48 VDC is driven by the DTMF encoder in the keypad. So, scrap it! In the end, the keypad will probably use 7 wires, 4 for rows and 3 for columns and the usual scan by rows/columns will work with any micro at any voltage level. Let the microcontroller create some kind of button-pressed tone. There are a lot of keypad applications that do this kind of thing. There is no reason the user has to hear DTMF although, if it is really a requirement, it could probably be created by the microcontroller. This would be an advanced feature. Just send a single consistent tone - that's the easy way. Don't forget, the dial tone, if it is going to be created, stops after the first digit. If the tones are going to be used, they can be prerecorded on the audio output gadget, whatever it is. The uC can select which tone (or presentation) is to be played at any given time. http://www.nerdkits.com/forum/thread/1885/ |
| Funvoyager:
Regarding the value of this, it might be tough marketing I it as a device for medical procedures (NO if so understand your suggestion cirrectkt( - the educational and marketing angle is what is probably do if this was built and duplicated because it could cut down on boredom in the waiting room while also having a combination of entertainment and education. I'm thinking self helo, health tios, answers to questions people don't wardrobes doctor (STD risks, testing, prevention, rtc), and I wonder now if this could be a two way communication device. For instance, looking - press one for durveys, then press one for yes, 2for no... And a confidential voice mail "suggestion box" etc |
| Beamin:
--- Quote from: skarecrow --- The pi has stereo audio out, just a matter of connecting it up to a cheap 8ohm speaker in the handset etc. --- End quote --- --- Quote from: skarecrow --- Nobody suggested adding a speaker. Sent from my XT1565 using Tapatalk --- End quote --- :wtf: By the way I tried this it makes some noise but its way too quiet to actually hear what it is. You can just tell that its connected but even putting your ear right up to it doesn't make an intelligible sound. You will need a simple amplifier circuit and a little output transformer. |
| skarecrow:
--- Quote from: Beamin on September 06, 2017, 04:09:07 pm --- --- Quote from: skarecrow --- The pi has stereo audio out, just a matter of connecting it up to a cheap 8ohm speaker in the handset etc. --- End quote --- --- Quote from: skarecrow --- Nobody suggested adding a speaker. Sent from my XT1565 using Tapatalk --- End quote --- :wtf: By the way I tried this it makes some noise but its way too quiet to actually hear what it is. You can just tell that its connected but even putting your ear right up to it doesn't make an intelligible sound. You will need a simple amplifier circuit and a little output transformer. --- End quote --- That quote belongs to someone else. I assumed they just meant the speaker that's already in the handset, which is why I questioned if they were 8ohm because I couldn't remember. Could you give some more details on exactly what you tried and with what equipment? Do you have a payphone also? The speaker output of a sound card should be more than powerful enough to drive a handset speaker. I've done it many times myself (with regular house phones though, not with a pay phone.). Back in high school I turned my 386 computer into a speaker phone by cutting a phone handset cord and putting some connectors on the wire to plug it into my sound card. Sent from my XT1565 using Tapatalk |
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