JordiCP Expert Licensed User Longtime User Mar 24, 2016 #1 This is a project/plattform from some years ago, which from time to time I am finding on Internet when searching for some tech keywords http://web.eecs.umich.edu/~prabal/projects/hijack/ The idea is to power a small device from the same audio jack and at the same time communicate with it through the audio and mic channels. It seems to me that it has become a bit "obsolete" (the links I find are quite old), I suppose because many proximity communication needs are solved nowadays with BT,Wifi, USB or even NFC. Also, the energy that can be provided through the audio jack is very low. Anyone has built/used any peripheral (other than audio) which uses the audio jack?
This is a project/plattform from some years ago, which from time to time I am finding on Internet when searching for some tech keywords http://web.eecs.umich.edu/~prabal/projects/hijack/ The idea is to power a small device from the same audio jack and at the same time communicate with it through the audio and mic channels. It seems to me that it has become a bit "obsolete" (the links I find are quite old), I suppose because many proximity communication needs are solved nowadays with BT,Wifi, USB or even NFC. Also, the energy that can be provided through the audio jack is very low. Anyone has built/used any peripheral (other than audio) which uses the audio jack?
Descartex Well-Known Member Licensed User Longtime User Mar 24, 2016 #2 Long years ago, i built an oscilloscope that comunicates with pc via jack. I remember i had to power it with a cell because it had not enough power to feed the whole components. I you want to, i can find the files and share it to you.
Long years ago, i built an oscilloscope that comunicates with pc via jack. I remember i had to power it with a cell because it had not enough power to feed the whole components. I you want to, i can find the files and share it to you.
JordiCP Expert Licensed User Longtime User Mar 24, 2016 #3 Wow! I would like to test it with android devices, but the underlying principles (harvesting and communication) should remain the same. Descartex said: I you want to, i can find the files and share it to you. Click to expand... Yes please, any info will be welcome I would like to contrast different working implementations Next week I will order THIS to play a little with it
Wow! I would like to test it with android devices, but the underlying principles (harvesting and communication) should remain the same. Descartex said: I you want to, i can find the files and share it to you. Click to expand... Yes please, any info will be welcome I would like to contrast different working implementations Next week I will order THIS to play a little with it
freedom2000 Well-Known Member Licensed User Longtime User Mar 24, 2016 #4 interesting but probably only with an "intellectual point of view" IMHO, the board you mention is quite expensive and will have a very limited interest compared to very cheap ESP8266 Wifi boards
interesting but probably only with an "intellectual point of view" IMHO, the board you mention is quite expensive and will have a very limited interest compared to very cheap ESP8266 Wifi boards
JordiCP Expert Licensed User Longtime User Mar 24, 2016 #5 You are right, difficult to beat an ESP8266 in cost terms. Perhaps the harvesting part is what I am more interested in. The board is for evaluating only. If I decide to do something the BOM can be much cheaper
You are right, difficult to beat an ESP8266 in cost terms. Perhaps the harvesting part is what I am more interested in. The board is for evaluating only. If I decide to do something the BOM can be much cheaper
freedom2000 Well-Known Member Licensed User Longtime User Mar 25, 2016 #6 Yep. I did look at this techno to emulate an IR emitter for "non Samsung" phones.
freedom2000 Well-Known Member Licensed User Longtime User Mar 25, 2016 #7 JordiCP said: You are right, difficult to beat an ESP8266 in cost terms. Perhaps the harvesting part is what I am more interested in. The board is for evaluating only. If I decide to do something the BOM can be much cheaper Click to expand... For power harvesting why don't you use the USB plug ? You can find there good 5V DC sufficient to power MCU boards an example : https://www.b4x.com/android/forum/threads/control-a-rc-plane-with-a-joystick.40568/#content
JordiCP said: You are right, difficult to beat an ESP8266 in cost terms. Perhaps the harvesting part is what I am more interested in. The board is for evaluating only. If I decide to do something the BOM can be much cheaper Click to expand... For power harvesting why don't you use the USB plug ? You can find there good 5V DC sufficient to power MCU boards an example : https://www.b4x.com/android/forum/threads/control-a-rc-plane-with-a-joystick.40568/#content
JordiCP Expert Licensed User Longtime User Mar 27, 2016 #8 freedom2000 said: For power harvesting why don't you use the USB plug ? Click to expand... You are right, and I suppose this is the right answer, but will test it for curiosity (I am quite square-headed, see my profile picture )
freedom2000 said: For power harvesting why don't you use the USB plug ? Click to expand... You are right, and I suppose this is the right answer, but will test it for curiosity (I am quite square-headed, see my profile picture )
freedom2000 Well-Known Member Licensed User Longtime User Mar 27, 2016 #9 and you are right to test it. Keep us informed
