| ??? 04/29/08 07:35 Read: times |
#154160 - Considor Following Responding to: ???'s previous message |
Dear Amit,
Please check following things, 1> how much is digital error?(1 LSB error or more) 2> remove stepper motor(H/W) & check ADC. (this will eliminate stepper motor generated noise if any). 3> also stepper motor control, lcd control signals & /wr , /rd of adc shares port2. Make sure software is not manipulating these port pins during stepper motor handeling/lcd operation. 4> make sure of stable Vcc, as changes / fluctuation in Vcc will reflect in Vref. (observe Vcc on good CRO, do not use MM). 5> instead of voltage devider for Vref try using some constant voltage source like zener or LDO voltage regulator |
| Topic | Author | Date |
| fluctuations in adc0804 output | 01/01/70 00:00 | |
| Things to consider... | 01/01/70 00:00 | |
| circuit diagram and program uploaded | 01/01/70 00:00 | |
| where are the decoupling caps | 01/01/70 00:00 | |
| You have to protect the reference input! | 01/01/70 00:00 | |
| Regarding 0.1 uf capacitor and reference voltage | 01/01/70 00:00 | |
| Considor Following | 01/01/70 00:00 | |
| Zener? | 01/01/70 00:00 | |
| reasons for suggesting zener. | 01/01/70 00:00 | |
and so what? | 01/01/70 00:00 |