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| Search found 9 matches |
| Author | Message |
|---|---|
 Topic: Wrong ADC value |
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| surajka Replies: 15 Views: 23934 |
 Forum: General CCS C Discussion Posted: Mon Oct 05, 2015 6:18 am Subject: Wrong ADC value |
| The input impedance of the instrumentation amplifier was 1M previosly, and feedback resistance 1M, in parallel with 1uF MLC. Output from the opamp was connected to mcu through a 4.7k resistor. Tried a ... | |
| Topic: Wrong ADC value |
|
| surajka Replies: 15 Views: 23934 |
Forum: General CCS C Discussion Posted: Mon Oct 05, 2015 4:37 am Subject: Wrong ADC value |
| The output was from an opamp instrumentation amplifier with a 4.7k impedance added. There is no negative supply rail involved. I removed the connection and added another voltage source to the pin. Now ... | |
| Topic: Wrong ADC value |
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| surajka Replies: 15 Views: 23934 |
Forum: General CCS C Discussion Posted: Mon Oct 05, 2015 3:58 am Subject: Wrong ADC value |
| RF Developer, I changed the code as you suggested. I included a floating input AN5(no such pin in the IC). Stable voltage is connected to AN10.
I am posting the code and results below. Strange thing ... |
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| Topic: Wrong ADC value |
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| surajka Replies: 15 Views: 23934 |
Forum: General CCS C Discussion Posted: Mon Oct 05, 2015 3:33 am Subject: Wrong ADC value |
| I am getting more stable values in the floating pins.
The simulation in proteus is giving the right values. |
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| Topic: Wrong ADC value |
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| surajka Replies: 15 Views: 23934 |
Forum: General CCS C Discussion Posted: Mon Oct 05, 2015 3:24 am Subject: Wrong ADC value |
| I changed to the code. No results.
#include <16F886.h> #device adc=10 #FUSES NOWDT //Watch Dog Timer #FUSES PUT //Power Up Timer //!#FUSES PROTE ... |
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| Topic: Wrong ADC value |
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| surajka Replies: 15 Views: 23934 |
Forum: General CCS C Discussion Posted: Sun Oct 04, 2015 7:40 am Subject: Wrong ADC value |
| What do you think the line in bold does ?
#include <16F886.h> #device adc=10 #FUSES WDT //Watch Dog Timer #FUSES PUT //Power Up Timer //!#FUS ... |
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| Topic: Wrong ADC value |
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| surajka Replies: 15 Views: 23934 |
Forum: General CCS C Discussion Posted: Sun Oct 04, 2015 6:44 am Subject: Wrong ADC value |
| hmm...
1) According to the datasheet I have , table 0-1, Fosc/8 is the only valid selection unless the PIC is in SLEEP. 2) You should disable the PWM peripheral as it uses that pin,though you say ... |
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| Topic: Wrong ADC value |
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| surajka Replies: 15 Views: 23934 |
Forum: General CCS C Discussion Posted: Sun Oct 04, 2015 5:23 am Subject: Wrong ADC value |
| this ...
setup_adc(ADC_CLOCK_INTERNAL); probably is the problem. Check the PIC datasheet, ADC section and review the text and charts as to what ADC clocks are valid for a 4MHz processor speed ... |
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| Topic: Wrong ADC value |
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| surajka Replies: 15 Views: 23934 |
Forum: General CCS C Discussion Posted: Sun Oct 04, 2015 4:43 am Subject: Wrong ADC value |
| I am getting wrong ADC values.
compiler v4.130 My output is getting like this BAT = 768 BAT = 0 BAT = 453 BAT = 377 BAT = 0 BAT = 593 BAT = 0 BAT = 768 BAT = 0 BAT = 428 BA ... |
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