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Sep 06, 2012, 01:08 PM
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Build Log

Test Bench Data Aquisition System for R/C Gas, Glow, and BLDC Motors

I have started building a data acquisition system for my test bench, and much of
the basic components I already have experience with. But I have purchased negative
pressure sensors that I have not used before, and I will need some help with.

I have a number of goals for this project, and the first and foremost goal is that anybody
that wants to build one too, should build one. I will provide as much support as I can, and
I sincerely hope others can contribute to that effort.

I will be using the Parallax Propeller for the project, and initially I will be downloading and
modifying existing "Spin" & "PASM" code from the Parallax Object Exchange. Later I will
start writing my own code, and then convert it to C++.

I have two reasons for using the Propeller, the first is: This is my normal choice for projects,
and is what I am use to using. Second, I am anxiously awaiting the Propeller II, and it's
capabilities for controlling multiple bldc motors at one time, increased video, and human
input capabilities. All these tasks are important for my future projects.

My goals for the system are:
1) easy for anybody else to complete.
2) Start with Basic inputs-outputs: rpm, cht, servo, display.
3) Add Throttle position, rpm acceleration - deceleration rate, ignition timing.
4) Data logging to an SD card.
5) Add multiple pressure sensors.
6) Inertia Dynomometer capability.
7) Make a smaller unit for flight testing
8) Expand capabilities to include bldc motors.

A separate but related project is to make an oval circuit (wind tunnel) for testing engines
and motors at flight rpms and loads.

Bill M.
Last edited by Capt. Quirk; Sep 07, 2012 at 01:19 AM.
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Sep 07, 2012, 07:42 PM
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A big thanks to you for sharing your work.

Have you considered using an EagleTree V4 logger for logging and display duties? It is very configurable.
Sep 08, 2012, 04:59 PM
Registered User
Originally Posted by brw0513_2 View Post
Have you considered using an EagleTree V4 logger for logging and display duties? It is very configurable.
I have used Eagle Tree before, and it has nice software.

But this project is designed to let people pick and choose what parts they want to use.
For example, maybe some one wants a bare bone tachometer, so they don't need to
use their old optical tach. if a user wants to do some simple dyno testing. Testing propellers
on really hot and humid days can be documented using up to date air density readings. Or perhaps
they are only interested in BLDC motors, but want exact thrust measurements. Anything is

I will make it as easy as possible to copy the project. But I will only be using Parallax
products like the Propeller and Basic Stamps. The best features of the Propeller:

1) There is no need for interrupts
2) It is like programming up to 8 Basic Stamps to work independently and parallel
at the same time.

Bill M.
Last edited by Capt. Quirk; Sep 08, 2012 at 05:17 PM.
Sep 08, 2012, 08:46 PM
Registered User
OK Bill. Watching with interest.

And happy to help in any way I can.
Sep 10, 2012, 09:44 PM
Registered User
Nav_Aids's Avatar

Sep 22, 2012, 08:41 PM
Disturbed, but in a good way.
RotoGoat's Avatar
Try looking up DATAQ starter kit. Cheap and easy
Nov 07, 2012, 02:52 AM
Registered User

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