Error Reading Power Values From Microcontroller
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Visited Search Results View More Blog Recent Blog Posts View More PMs Unread PMs Inbox Send New PM View More Page Extras Menu Forum Themes Elegant Mobile Home » All Forums » [8-Bit Microcontrollers] » http://www.microchip.com/forums/m535443.aspx Peripherals / Core Independent Peripherals » Analog (ADC, Comp, DAC, HC I/O, OPA, PRG, SlopeComp, ZCD) » PIC18F8722 ADC error in reading voltage accurately Mark Thread UnreadFlat Reading Mode❐ PIC18F8722 ADC error in reading voltage accurately Author Post Essentials Only Full Version sukhavsa New Member Total Posts : 4 Reward points : 0 Joined: 2010/05/05 23:20:00Location: 0 Status: offline 2010/11/15 12:11:45 (permalink) 0 PIC18F8722 ADC error in reading voltage accurately I error reading am using the ADC on PIC18f8722 to measure the voltage output of a sensor. I have noticed a considerable error in the ADC readings. To make sure the ADC was working fine i connected a regulated power suppy to the ADC and the error was still there. The difference in the voltage measured and the actual voltage was ranging from 0.01V to 0.1V(which is considerable and not what the datasheet says) the error reading power difference was low for lower voltages i.e 0.01 for an input of 0.5V and increased as the input voltage increased in an almost linear fashion. I have tried oversampling but still the issue remained. Any one has an idea the reason behind this behaviour!!! here are my ADC config settings ADCON1 = 0x00; ADCON0 = 0b00010101; // AN5(RF0) as ADC input channel ADCON2 = 0b10111110; //right justified, 20TAD, FOSC/64 #1 5 Replies Related Threads Stefan Uhlemayr Super Member Total Posts : 4292 Reward points : 0 Joined: 2005/05/12 12:25:46Location: Germany Status: offline Re:PIC18F8722 ADC error in reading voltage accurately 2010/11/15 12:22:16 (permalink) 0 Some of the common reasons for bad/wrong ad-results: - missing decoupling (at least one 0.1 uF ceramic (!) capacitor close (!) to each (!) Vdd/Vss-pair of your pic) - noisy/unstable/bad reference-voltage (What reference you use? Missing information in your comments of the ad-setup...) - too fast conversion / not waiting the required ad-timings (At what speed your pic is running?) - PIC-errata (see this errata-sheet for your pic) Greetings, Stefan post edited by Stefan Uhlemayr - 2010/11/15 12:23:19 Software / Hardware / Explorer 16 #2 sukhavsa New Member Total Posts : 4 Reward points : 0 Joined: 2010/05/05 23:20:00Location: 0 Status: offline Re:PIC18F8722 ADC
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