Arduino ADC supplement

Hi all, Kinda new to the whole blog thing, but I have been wondering about the IMU5DOF and Arduino's lack of substantial ADC bits for resolution for a heli. Anyway, Could we supplement the ADC up to 2048 bits by combining two ADC channels like this?You know I have been thinking about the resolution issue with 300d/s gyros and the resolution of the AVR168 chips. It seems to me if we think outside the box for a moment the problem can be easily solved. It would require 3 op amps per channel but it may be worth it.The first op amd is a unity gain buffer. The other two op amps are configured to have 0 -3.3v for an input of 0-1.5v the second op amp would drive an ADC1 input directly. The third op amdwould be biased so that it did not produce output until it reveived an input of 1.5v. This coulkd be easily achieved with two diodes in series to the input of op amp 3 the voltage drop across each would be .7v and two would be 1.4v. A forward bias would be achieved at ~1.4v hence setting the bias. The third op amp would feed ADC2 and readings would only be taken from this if ADC1 achieved an overflow condition (full 1024 bits). This should give more resolution than ever needed. :)

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • I don't have a lot of embedded or electronics background but I did some research on op-amps and I don't think that this will work. I don't think that increasing the resolution of the ADC could increase the accuracy and sensitivity of the IMU (or 300d/s gyro specifically). It's similar to increasing the resolution of a compressed picture. It will be increased but the data would be an approximation.

    -Aludra
  • average two readings - its bound to be easier than this.
  • T3
    Looks good on paper, but in practice this would be a mess on PCB board.
This reply was deleted.

Activity

Chris Anderson liked Zara Mae Pickering's profile
May 21
DIY Robocars via Twitter
RT @chr1sa: Donkeycar 4.4 released with tons of new features, including path learning (useful with GPS outdoors), better Web and Lidar supp…
Nov 27, 2022
DIY Robocars via Twitter
RT @NXP: We are already biting our nails in anticipation of the #NXPCupEMEA challenge! 😉 Did you know there are great cash prizes to be won…
Nov 24, 2022
DIY Robocars via Twitter
RT @gclue_akira: レースまであと3日。今回のコースは激ムズかも。あと一歩 #jetracer https://t.co/GKcEjImQ3t
Nov 24, 2022
DIY Robocars via Twitter
UC Berkeley's DIY robocar program https://roar.berkeley.edu/
Nov 24, 2022
DIY Robocars via Twitter
RT @chr1sa: The next @DIYRobocars autonomous car race at @circuitlaunch will be on Sat, Dec 10. Thrills, spills and a Brazilian BBQ. Fun…
Nov 24, 2022
DIY Robocars via Twitter
RT @arthiak_tc: Donkey car platform ... Still training uses behavioral cloning #TCXpo #diyrobocar @OttawaAVGroup https://t.co/PHBYwlFlnE
Nov 20, 2022
DIY Robocars via Twitter
RT @emurmur77: Points for style. @donkeycar racing in @diyrobocars at @UCSDJacobs thanks @chr1sa for taking the video. https://t.co/Y2hMyj1…
Nov 20, 2022
DIY Robocars via Twitter
RT @SmallpixelCar: Going to @diyrobocars race at @UCSDJacobs https://t.co/Rrf9vDJ8TJ
Nov 8, 2022
DIY Robocars via Twitter
RT @SmallpixelCar: Race @diyrobocars at @UCSDJacobs thanks @chr1sa for taking the video. https://t.co/kK686Hb9Ej
Nov 8, 2022
DIY Robocars via Twitter
RT @PiWarsRobotics: Presenting: the Hacky Racers Robotic Racing Series in collaboration with #PiWars. Find out more and register your inter…
Oct 23, 2022
DIY Robocars via Twitter
RT @Hacky_Racers: There will be three classes at this event: A4, A2, and Hacky Racer! A4 and A2 are based around UK paper sizing and existi…
Oct 23, 2022
DIY Robocars via Twitter
Oct 23, 2022
DIY Robocars via Twitter
Oct 19, 2022
DIY Robocars via Twitter
Oct 18, 2022
DIY Robocars via Twitter
RT @NeaveEng: Calling all UK based folks interested in @diyrobocars, @f1tenth, @donkey_car, and similar robot racing competitions! @hacky_r…
Oct 13, 2022
More…