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Old Jan 15, 2013, 08:32 AM
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Odometer - Hours - Timer

Hello,
I am looking for a simple hour meter that would work somewhat like an odometer that I can put on my gasser. For our electrics we just use a count down timer on the radio and when done flying, we call that 1 flight and of course over time we have a number of flights that we have flown. However, since the gasser has a longer flying time, I want to install a simple lightweight LCD timer on board that will run when the switch is on. It would work similar to an hour meter on a farm tractor or other industrial equipment.
Does anyone have an idea where I can get such a timer?
Thanks, Paul
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Old Jan 15, 2013, 12:25 PM
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Does it have to be in the airplane? What about using the integrated timer that's in the DX8 and DX18?

Andy
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Old Jan 18, 2013, 09:50 AM
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go to the picaxe forum - you will get some ideas there
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Old Jan 19, 2013, 12:38 AM
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Thanks Phil, I will take a look at it.

Andy, can you give me more details?
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Old Jan 19, 2013, 03:40 AM
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izak, an Arduino Pro Mini, and an 8x2 LCD would be ideal for this, since its probably a one-off.

If you are using CDI ignitions on your gassers, you can "Y" the hall sensor, and write a program to start a timer when it senses the hall signal, and stop once the signal has stopped for a period of time, write that to EEPROM, and voila!!! 8x2 lcd's are pretty small. The whole thing would only be slightly larger than a 9V battery.

Where are you in Indy? I'm in N.E. indy.
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Old Jan 19, 2013, 11:21 PM
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I'm planning to add one to our DIY CDI project at some point.

I figure that adding an hour meter will be pretty handy for helping with service intervals. I'll probably also write in a method to do run time/RPM standardization, e.g. an hours @ X RPM type figure.

It's also easy enough to just have a single LED flash out the hour count for a few minutes each time after the engine stops. I'm not a fan of the picaxe, but if it seems easier to you then I guess it's worth the price markup and limited programming language.
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Old Jan 20, 2013, 12:17 AM
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Quote:
Originally Posted by KKUSA View Post
izak, an Arduino Pro Mini, and an 8x2 LCD would be ideal for this, since its probably a one-off.

If you are using CDI ignitions on your gassers, you can "Y" the hall sensor, and write a program to start a timer when it senses the hall signal, and stop once the signal has stopped for a period of time, write that to EEPROM, and voila!!! 8x2 lcd's are pretty small. The whole thing would only be slightly larger than a 9V battery.

Where are you in Indy? I'm in N.E. indy.
Thanks KK. It is a one-off.

We live on the north side of Mooresville.
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Old Jan 20, 2013, 07:19 PM
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Thanks KK. It is a one-off.

We live on the north side of Mooresville.
Cool, I have some RC buddies in Mooresville. Jay Hurst, Kerry Muncy and a few others. You know them?
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Old Jan 21, 2013, 12:14 AM
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This will be my choice after looking Microchip, St micro, TI, Atmel, Silicon Labs, etc... Avr Butterfly can do the job very easily of a Odometer - Hours - Timer plus control you CDI at the same time. All micro-controller manufacturer made MCU with Segment LCD controller, however the problem is not the MCU but the LCD Display which come in limited form of numbers only or alphanumeric which can display letter more easy, the price of a Segment LCD is very economical compare to a Graphic display costing much more, Segment Display are ordered in the thousands or ten of thousand which make it economical for the developer.

Atmel AVR Butterfly ------ ATAVRBFLY-ND $21.25 from Digikey
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Old Jan 21, 2013, 09:18 AM
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Would something like this work?
http://www.alliedelec.com/search/pro...x?SKU=70115463

Dan
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Old Jan 21, 2013, 10:45 AM
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The Dollar Tree sells a 5 digit pedometer that could probably be modified to work. It just has a pendulum switch to count the steps and that could be removed. Then just feed it with a pulse every six minutes to get a 1/10th hour meter.

PS If your motor is spark and not glow, you can get a cheap hour meter off ebay for ATVs etc, that is powered by the spark. http://www.ebay.com/itm/Hour-Meter-F...ca541d&vxp=mtr
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Old Jan 21, 2013, 05:01 PM
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Quote:
Originally Posted by jeffs555 View Post
The Dollar Tree sells a 5 digit pedometer that could probably be modified to work. It just has a pendulum switch to count the steps and that could be removed. Then just feed it with a pulse every six minutes to get a 1/10th hour meter.

PS If your motor is spark and not glow, you can get a cheap hour meter off ebay for ATVs etc, that is powered by the spark. http://www.ebay.com/itm/Hour-Meter-F...ca541d&vxp=mtr
For the pedometer, you still need some electronics to interface to it, so not very economical, or flexible.

Those spark meters will not work on most RC engines. They use an inductive pickup that wraps around the plug wire. Most gas RC engines have a very well shielded plug wire that will inhibit the sensor from working.
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