| ??? 04/01/08 17:26 Read: times |
#152851 - are you using an RC low pass before the ADC? Responding to: ???'s previous message |
will significantly reduce the noise the ADC sees.
Try to improve hardware first:) Some tips along that way: Adapt its time constant of the RC filter to have an appropriate compromise for your application. Check that the resistor is small enough so that input bias current and/or resistance of the ADC are (well) below 1 LSB. Check that the analog reference voltage is buffered by a condensator or doesn't need buffering Eventually feed the poti with the analog reference voltage (check data sheets, take ESD precautions, etc.) Check your poti is specified for more than xx cycles. Check your digital hardware does not interfere (eventually put the 8051 into idle mode). Greetings, Frieder |
| Topic | Author | Date |
| Adding hysteresis on top of my sampling | 01/01/70 00:00 | |
| my method | 01/01/70 00:00 | |
| For this to work... | 01/01/70 00:00 | |
| adaptive delta ... ? | 01/01/70 00:00 | |
| All data is keep in eeprom | 01/01/70 00:00 | |
| What does the oscilloscope tell you? | 01/01/70 00:00 | |
| not a good ides | 01/01/70 00:00 | |
| Median filter ? | 01/01/70 00:00 | |
| are you using an RC low pass before the ADC? | 01/01/70 00:00 | |
| check here | 01/01/70 00:00 | |
Found a minor issue in hardware...not dealbreaker | 01/01/70 00:00 | |
| Low Pass Filter in Software | 01/01/70 00:00 |