| ??? 04/22/05 20:21 Read: times |
#92207 - Re: ADC as digital input Responding to: ???'s previous message |
Oleg said:
So, does anybody have real worked schematic of this task, could you public it here, please? I must say I never tried it but I have seen it working perfectly. Old VCRs had a wired remote control unit. Only two wires came out of VCR, going inside remote control. Out of curosity I opened-up the remote control and observed the following 1) V+ and V- are two wires entering into the remote control. 2) There are keys. Each key connect its resistor to this supply rail 3) Resistors are of different value, of course, for each key. 4) The VCR measures how much current flows through this cable. 5) There might be a current to voltage converter inside VCR. What I mean to say is that this method works and you can try it with 5V using an op-amp scaler to fit the voltage to be suitable with Cygnal on chip ADC input. |
| Topic | Author | Date |
| ADC as digital input | 01/01/70 00:00 | |
| Saturation | 01/01/70 00:00 | |
| good point | 01/01/70 00:00 | |
| URL | 01/01/70 00:00 | |
| all good, but | 01/01/70 00:00 | |
| optocouplers | 01/01/70 00:00 | |
| Re: ADC as digital input | 01/01/70 00:00 | |
| go analog | 01/01/70 00:00 | |
| schematic | 01/01/70 00:00 | |
| It is possible to do but why..... | 01/01/70 00:00 | |
| opto | 01/01/70 00:00 | |
| Possible but troublesome... | 01/01/70 00:00 | |
| very informative | 01/01/70 00:00 | |
overcomming opto difference | 01/01/70 00:00 |