openrcforums

Should be able to use just a transmitter module and a bound receiver if you want to save money. Just need to catch the data on the s.port socket.
The receiver goes aloft.

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I see timer1 and timer2 are both being used in oXs_general.cpp. I assume one is used for reading an RC channel. What's the other one being used for and can I use it for my 35Hz pwm needs?

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I'm now realizing 8 bit pwm is standard. I was hoping for 10 bit at something around 30hz. I think I can do that on pin 11 using timer1.

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I'd like to build an openxsensor with 2 temperature sensors, rpm, and the ability to read a channel and output to a pin a pwm 30 times a second.

Before I build the hardware, does an Arduino have enough power to do all that?

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My pleasure

kalle123 wrote:

raleighcoter wrote:Glad i could help both of you.

How did you help me? Must have forgotten ...

viewtopic.php?t=8976

Glad i could help both of you. I enjoy spreading the hobby.

Who is kalle123? I thought I was the inspirer. By the way, current sensors output a voltage that is proportional to current measured. You can hook up 6 current sensors as voltage sensors. All you need to do is figure out the range and offset in opentx. Hint: the n2 minihub instructions have the rang...

...power in goes to raw pin and you can grab 5v regulated and ground from all over the arduino

Rpm is from the CDI on my DLE30. Just a single signal wire to digital pin 8. Current is an acs712 to analog pin 2. Current sensor gets power and ground. Rpm doesn't need ground in my setup because i run an opto switch it ties ground on the engine to the radio. If not you'll need ground for the rpm c...

Made an rpm/current sensor for my airplane for $4 and about 20 minutes of my time. Now i get pack capacity and engine run status. Commercial products to do this cost about 40 bucks. Outstanding.

Never mind, found one. Now to get it integrated.

I'd like to try using this on jeti. Does anybody know if there's a jeti telemetry library to start from?

Thanks mstrens. That was a great explanation. Just need my arduino delivered and i can set this up.

Thanks mike. Are there examples for configuring osx? How are the calibration tables defined?

It... Is on my computer at work. Ultimately i want to use the same rtd that came with my sp-rpm sensors which are 100k ntc rtd devices to measure headntemp on my gas helicopter and to also pick up rpm from a hall sensor. Rpm is easy. Temp is a bit lacking in the literature.

But the resistance of the rtd varies from around a few K to over several hundred k over the temp range for 100k ntc rtd, and the important temps happen at the low end of the resistance range for my application.

I would have thought the input pin would have a higher impedance to reduce the current drawn thru the input pin while the source should support a lower impedance to provide that voltage/power without sagging. Additionally, higher resistance will reduce power dissipated in the rtd as heat.

I was not aware.

I could eventually use a 10k but the 100k will draw less current and the voltages out should be similar if wired in series with another resistor between ground and 3.3v. I assume i pick an analog input pin but am not sure how to configure oxs.

Using a life battery to power the arduino pro. Will use a 100k ntc rtd with a series resistor around 10k wired between regulated 3.3v and ground and measure voltage across the voltage divider. I'm interested in 100-300 F so i'll fit a linear curve in that range. Does that sound about right?

Any recommendation on the resistor to use in the required voltage divider? How do i map the resulting voltage to temperature? Is there some documentation i can read?

Looking to do this on an arduino pro with hall sensor and standard rtd for temp. Did you or anyone ever get this working?